Portable check empty directory












7














With Bash and Dash, you can check for an empty directory using just the shell
(ignore dotfiles to keep things simple):



set *
if [ -e "$1" ]
then
echo 'not empty'
else
echo 'empty'
fi


However I recently learned that Zsh fails spectacularly in this case:



% set *
zsh: no matches found: *

% echo "$? $#"
1 0


So not only does the set command fail, but it doesn't even set $@. I suppose
I could test if $# is 0, but it appears that Zsh even stops execution:



% { set *; echo 2; }
zsh: no matches found: *


Compare with Bash and Dash:



$ { set *; echo 2; }
2


Can this be done in a way that works in bash, dash and zsh?










share|improve this question









New contributor




Three is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

























    7














    With Bash and Dash, you can check for an empty directory using just the shell
    (ignore dotfiles to keep things simple):



    set *
    if [ -e "$1" ]
    then
    echo 'not empty'
    else
    echo 'empty'
    fi


    However I recently learned that Zsh fails spectacularly in this case:



    % set *
    zsh: no matches found: *

    % echo "$? $#"
    1 0


    So not only does the set command fail, but it doesn't even set $@. I suppose
    I could test if $# is 0, but it appears that Zsh even stops execution:



    % { set *; echo 2; }
    zsh: no matches found: *


    Compare with Bash and Dash:



    $ { set *; echo 2; }
    2


    Can this be done in a way that works in bash, dash and zsh?










    share|improve this question









    New contributor




    Three is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.























      7












      7








      7







      With Bash and Dash, you can check for an empty directory using just the shell
      (ignore dotfiles to keep things simple):



      set *
      if [ -e "$1" ]
      then
      echo 'not empty'
      else
      echo 'empty'
      fi


      However I recently learned that Zsh fails spectacularly in this case:



      % set *
      zsh: no matches found: *

      % echo "$? $#"
      1 0


      So not only does the set command fail, but it doesn't even set $@. I suppose
      I could test if $# is 0, but it appears that Zsh even stops execution:



      % { set *; echo 2; }
      zsh: no matches found: *


      Compare with Bash and Dash:



      $ { set *; echo 2; }
      2


      Can this be done in a way that works in bash, dash and zsh?










      share|improve this question









      New contributor




      Three is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      With Bash and Dash, you can check for an empty directory using just the shell
      (ignore dotfiles to keep things simple):



      set *
      if [ -e "$1" ]
      then
      echo 'not empty'
      else
      echo 'empty'
      fi


      However I recently learned that Zsh fails spectacularly in this case:



      % set *
      zsh: no matches found: *

      % echo "$? $#"
      1 0


      So not only does the set command fail, but it doesn't even set $@. I suppose
      I could test if $# is 0, but it appears that Zsh even stops execution:



      % { set *; echo 2; }
      zsh: no matches found: *


      Compare with Bash and Dash:



      $ { set *; echo 2; }
      2


      Can this be done in a way that works in bash, dash and zsh?







      bash zsh wildcards portability dash






      share|improve this question









      New contributor




      Three is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      share|improve this question









      New contributor




      Three is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.









      share|improve this question




      share|improve this question








      edited yesterday









      terdon

      129k31252427




      129k31252427






      New contributor




      Three is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.









      asked yesterday









      ThreeThree

      362




      362




      New contributor




      Three is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.





      New contributor





      Three is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.






      Three is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.






















          2 Answers
          2






          active

          oldest

          votes


















          5














          While zsh's default behaviour is to give an error, this is controlled by the nomatch option. You can unset the option to leave the * in place the way that bash and dash do:



          setopt -o nonomatch


          While that command won't work in either of the others, you can just ignore that:



          setopt -o nonomatch 2>/dev/null || true ; set *


          This runs setopt on zsh, and suppresses the error output (2>/dev/null) and return code (|| true) of the failed command on the others.



          As written it's problematic if there is a file, for example, -e: then you will run set -e and change the shell options to terminate whenever a command fails; there are worse outcomes if you're creative. set -- * will be safer and prevent the option changes.






          share|improve this answer























          • If a file is named *, then $1 equals * and [ -e "$1" ] passes, meaning the example in the question still works
            – Three
            yesterday










          • @Three Fair point! It's conceptually iffy but it does actually work, since if there is a file there then... there is a file there.
            – Michael Homer
            yesterday



















          2














          Most portable way would be via set and globstar for all POSIX-compliant shells. This has been shown in Gilles's answer on a related question. I've adapted the method slightly into a function:



          rm -rf empty_dir/
          mkdir empty_dir/
          pwd
          cd empty_dir/
          pwd
          dir_empty(){

          # https://stackoverflow.com/a/9911082/3701431
          if [ -n "$ZSH_VERSION" ]; then
          # https://unix.stackexchange.com/a/310553/85039
          setopt +o nomatch
          fi

          set -- * .*
          echo "$@"
          for i; do
          [ "$i" = "." ] || [ "$i" = ".." ] && continue
          [ -e "$i" ] && echo "Not empty" && return 1
          done
          echo "Empty" && return 0
          }
          dir_empty
          touch '*'
          dir_empty


          The big problem with zsh is that while ksh and bash behave in more or less consistent manner - that is when we do set * .* you will have 3 positional parameters * . .. in really empty directory - in zsh you will get * .* as positional parameters. Luckily at least for i ; do ... done to iterate over positional parameters works consistently. The rest is just iteration and check for existence of the filename, with . and .. skipped.





          Try it online in ksh!



          Try it online in zsh!






          share|improve this answer























          • @Three I've adapted the answer to check for zsh. Unfortunatelly for us zsh decided to go the weird way instead of similar behavior to bash or other shells, since according to POSIX: "If the pattern does not match any pathnames, the returned number of matched paths is set to 0, and the contents of pglob->gl_pathv are implementation-defined." source
            – Sergiy Kolodyazhnyy
            yesterday










          • turning nomatch everywhere risks breaking code that assumes the default (and very sensible) setting that sh and bash get wrong, so the change really should be localized only to this function
            – thrig
            yesterday










          • @thrig Well, considering that so far others haven't found a way to make glob work without nomatch, that's the best we got. We can also toggle it back before function exits, of course. Or we could just abandon shell ways and just use something else, like find for instance.
            – Sergiy Kolodyazhnyy
            yesterday










          • @Three I've revised the answer again. Probably this is the best I can do, as zsh seems to favor features instead of consistency. Hope this helps somewhat.
            – Sergiy Kolodyazhnyy
            yesterday










          • @SergiyKolodyazhnyy yes thanks - I would just avoid Zsh totally but its used on Manjaro - maybe I will avoid that too :)
            – Three
            yesterday











          Your Answer








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          2 Answers
          2






          active

          oldest

          votes








          2 Answers
          2






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes









          5














          While zsh's default behaviour is to give an error, this is controlled by the nomatch option. You can unset the option to leave the * in place the way that bash and dash do:



          setopt -o nonomatch


          While that command won't work in either of the others, you can just ignore that:



          setopt -o nonomatch 2>/dev/null || true ; set *


          This runs setopt on zsh, and suppresses the error output (2>/dev/null) and return code (|| true) of the failed command on the others.



          As written it's problematic if there is a file, for example, -e: then you will run set -e and change the shell options to terminate whenever a command fails; there are worse outcomes if you're creative. set -- * will be safer and prevent the option changes.






          share|improve this answer























          • If a file is named *, then $1 equals * and [ -e "$1" ] passes, meaning the example in the question still works
            – Three
            yesterday










          • @Three Fair point! It's conceptually iffy but it does actually work, since if there is a file there then... there is a file there.
            – Michael Homer
            yesterday
















          5














          While zsh's default behaviour is to give an error, this is controlled by the nomatch option. You can unset the option to leave the * in place the way that bash and dash do:



          setopt -o nonomatch


          While that command won't work in either of the others, you can just ignore that:



          setopt -o nonomatch 2>/dev/null || true ; set *


          This runs setopt on zsh, and suppresses the error output (2>/dev/null) and return code (|| true) of the failed command on the others.



          As written it's problematic if there is a file, for example, -e: then you will run set -e and change the shell options to terminate whenever a command fails; there are worse outcomes if you're creative. set -- * will be safer and prevent the option changes.






          share|improve this answer























          • If a file is named *, then $1 equals * and [ -e "$1" ] passes, meaning the example in the question still works
            – Three
            yesterday










          • @Three Fair point! It's conceptually iffy but it does actually work, since if there is a file there then... there is a file there.
            – Michael Homer
            yesterday














          5












          5








          5






          While zsh's default behaviour is to give an error, this is controlled by the nomatch option. You can unset the option to leave the * in place the way that bash and dash do:



          setopt -o nonomatch


          While that command won't work in either of the others, you can just ignore that:



          setopt -o nonomatch 2>/dev/null || true ; set *


          This runs setopt on zsh, and suppresses the error output (2>/dev/null) and return code (|| true) of the failed command on the others.



          As written it's problematic if there is a file, for example, -e: then you will run set -e and change the shell options to terminate whenever a command fails; there are worse outcomes if you're creative. set -- * will be safer and prevent the option changes.






          share|improve this answer














          While zsh's default behaviour is to give an error, this is controlled by the nomatch option. You can unset the option to leave the * in place the way that bash and dash do:



          setopt -o nonomatch


          While that command won't work in either of the others, you can just ignore that:



          setopt -o nonomatch 2>/dev/null || true ; set *


          This runs setopt on zsh, and suppresses the error output (2>/dev/null) and return code (|| true) of the failed command on the others.



          As written it's problematic if there is a file, for example, -e: then you will run set -e and change the shell options to terminate whenever a command fails; there are worse outcomes if you're creative. set -- * will be safer and prevent the option changes.







          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited yesterday

























          answered yesterday









          Michael HomerMichael Homer

          46.4k8121161




          46.4k8121161












          • If a file is named *, then $1 equals * and [ -e "$1" ] passes, meaning the example in the question still works
            – Three
            yesterday










          • @Three Fair point! It's conceptually iffy but it does actually work, since if there is a file there then... there is a file there.
            – Michael Homer
            yesterday


















          • If a file is named *, then $1 equals * and [ -e "$1" ] passes, meaning the example in the question still works
            – Three
            yesterday










          • @Three Fair point! It's conceptually iffy but it does actually work, since if there is a file there then... there is a file there.
            – Michael Homer
            yesterday
















          If a file is named *, then $1 equals * and [ -e "$1" ] passes, meaning the example in the question still works
          – Three
          yesterday




          If a file is named *, then $1 equals * and [ -e "$1" ] passes, meaning the example in the question still works
          – Three
          yesterday












          @Three Fair point! It's conceptually iffy but it does actually work, since if there is a file there then... there is a file there.
          – Michael Homer
          yesterday




          @Three Fair point! It's conceptually iffy but it does actually work, since if there is a file there then... there is a file there.
          – Michael Homer
          yesterday













          2














          Most portable way would be via set and globstar for all POSIX-compliant shells. This has been shown in Gilles's answer on a related question. I've adapted the method slightly into a function:



          rm -rf empty_dir/
          mkdir empty_dir/
          pwd
          cd empty_dir/
          pwd
          dir_empty(){

          # https://stackoverflow.com/a/9911082/3701431
          if [ -n "$ZSH_VERSION" ]; then
          # https://unix.stackexchange.com/a/310553/85039
          setopt +o nomatch
          fi

          set -- * .*
          echo "$@"
          for i; do
          [ "$i" = "." ] || [ "$i" = ".." ] && continue
          [ -e "$i" ] && echo "Not empty" && return 1
          done
          echo "Empty" && return 0
          }
          dir_empty
          touch '*'
          dir_empty


          The big problem with zsh is that while ksh and bash behave in more or less consistent manner - that is when we do set * .* you will have 3 positional parameters * . .. in really empty directory - in zsh you will get * .* as positional parameters. Luckily at least for i ; do ... done to iterate over positional parameters works consistently. The rest is just iteration and check for existence of the filename, with . and .. skipped.





          Try it online in ksh!



          Try it online in zsh!






          share|improve this answer























          • @Three I've adapted the answer to check for zsh. Unfortunatelly for us zsh decided to go the weird way instead of similar behavior to bash or other shells, since according to POSIX: "If the pattern does not match any pathnames, the returned number of matched paths is set to 0, and the contents of pglob->gl_pathv are implementation-defined." source
            – Sergiy Kolodyazhnyy
            yesterday










          • turning nomatch everywhere risks breaking code that assumes the default (and very sensible) setting that sh and bash get wrong, so the change really should be localized only to this function
            – thrig
            yesterday










          • @thrig Well, considering that so far others haven't found a way to make glob work without nomatch, that's the best we got. We can also toggle it back before function exits, of course. Or we could just abandon shell ways and just use something else, like find for instance.
            – Sergiy Kolodyazhnyy
            yesterday










          • @Three I've revised the answer again. Probably this is the best I can do, as zsh seems to favor features instead of consistency. Hope this helps somewhat.
            – Sergiy Kolodyazhnyy
            yesterday










          • @SergiyKolodyazhnyy yes thanks - I would just avoid Zsh totally but its used on Manjaro - maybe I will avoid that too :)
            – Three
            yesterday
















          2














          Most portable way would be via set and globstar for all POSIX-compliant shells. This has been shown in Gilles's answer on a related question. I've adapted the method slightly into a function:



          rm -rf empty_dir/
          mkdir empty_dir/
          pwd
          cd empty_dir/
          pwd
          dir_empty(){

          # https://stackoverflow.com/a/9911082/3701431
          if [ -n "$ZSH_VERSION" ]; then
          # https://unix.stackexchange.com/a/310553/85039
          setopt +o nomatch
          fi

          set -- * .*
          echo "$@"
          for i; do
          [ "$i" = "." ] || [ "$i" = ".." ] && continue
          [ -e "$i" ] && echo "Not empty" && return 1
          done
          echo "Empty" && return 0
          }
          dir_empty
          touch '*'
          dir_empty


          The big problem with zsh is that while ksh and bash behave in more or less consistent manner - that is when we do set * .* you will have 3 positional parameters * . .. in really empty directory - in zsh you will get * .* as positional parameters. Luckily at least for i ; do ... done to iterate over positional parameters works consistently. The rest is just iteration and check for existence of the filename, with . and .. skipped.





          Try it online in ksh!



          Try it online in zsh!






          share|improve this answer























          • @Three I've adapted the answer to check for zsh. Unfortunatelly for us zsh decided to go the weird way instead of similar behavior to bash or other shells, since according to POSIX: "If the pattern does not match any pathnames, the returned number of matched paths is set to 0, and the contents of pglob->gl_pathv are implementation-defined." source
            – Sergiy Kolodyazhnyy
            yesterday










          • turning nomatch everywhere risks breaking code that assumes the default (and very sensible) setting that sh and bash get wrong, so the change really should be localized only to this function
            – thrig
            yesterday










          • @thrig Well, considering that so far others haven't found a way to make glob work without nomatch, that's the best we got. We can also toggle it back before function exits, of course. Or we could just abandon shell ways and just use something else, like find for instance.
            – Sergiy Kolodyazhnyy
            yesterday










          • @Three I've revised the answer again. Probably this is the best I can do, as zsh seems to favor features instead of consistency. Hope this helps somewhat.
            – Sergiy Kolodyazhnyy
            yesterday










          • @SergiyKolodyazhnyy yes thanks - I would just avoid Zsh totally but its used on Manjaro - maybe I will avoid that too :)
            – Three
            yesterday














          2












          2








          2






          Most portable way would be via set and globstar for all POSIX-compliant shells. This has been shown in Gilles's answer on a related question. I've adapted the method slightly into a function:



          rm -rf empty_dir/
          mkdir empty_dir/
          pwd
          cd empty_dir/
          pwd
          dir_empty(){

          # https://stackoverflow.com/a/9911082/3701431
          if [ -n "$ZSH_VERSION" ]; then
          # https://unix.stackexchange.com/a/310553/85039
          setopt +o nomatch
          fi

          set -- * .*
          echo "$@"
          for i; do
          [ "$i" = "." ] || [ "$i" = ".." ] && continue
          [ -e "$i" ] && echo "Not empty" && return 1
          done
          echo "Empty" && return 0
          }
          dir_empty
          touch '*'
          dir_empty


          The big problem with zsh is that while ksh and bash behave in more or less consistent manner - that is when we do set * .* you will have 3 positional parameters * . .. in really empty directory - in zsh you will get * .* as positional parameters. Luckily at least for i ; do ... done to iterate over positional parameters works consistently. The rest is just iteration and check for existence of the filename, with . and .. skipped.





          Try it online in ksh!



          Try it online in zsh!






          share|improve this answer














          Most portable way would be via set and globstar for all POSIX-compliant shells. This has been shown in Gilles's answer on a related question. I've adapted the method slightly into a function:



          rm -rf empty_dir/
          mkdir empty_dir/
          pwd
          cd empty_dir/
          pwd
          dir_empty(){

          # https://stackoverflow.com/a/9911082/3701431
          if [ -n "$ZSH_VERSION" ]; then
          # https://unix.stackexchange.com/a/310553/85039
          setopt +o nomatch
          fi

          set -- * .*
          echo "$@"
          for i; do
          [ "$i" = "." ] || [ "$i" = ".." ] && continue
          [ -e "$i" ] && echo "Not empty" && return 1
          done
          echo "Empty" && return 0
          }
          dir_empty
          touch '*'
          dir_empty


          The big problem with zsh is that while ksh and bash behave in more or less consistent manner - that is when we do set * .* you will have 3 positional parameters * . .. in really empty directory - in zsh you will get * .* as positional parameters. Luckily at least for i ; do ... done to iterate over positional parameters works consistently. The rest is just iteration and check for existence of the filename, with . and .. skipped.





          Try it online in ksh!



          Try it online in zsh!







          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited yesterday

























          answered yesterday









          Sergiy KolodyazhnyySergiy Kolodyazhnyy

          8,46312254




          8,46312254












          • @Three I've adapted the answer to check for zsh. Unfortunatelly for us zsh decided to go the weird way instead of similar behavior to bash or other shells, since according to POSIX: "If the pattern does not match any pathnames, the returned number of matched paths is set to 0, and the contents of pglob->gl_pathv are implementation-defined." source
            – Sergiy Kolodyazhnyy
            yesterday










          • turning nomatch everywhere risks breaking code that assumes the default (and very sensible) setting that sh and bash get wrong, so the change really should be localized only to this function
            – thrig
            yesterday










          • @thrig Well, considering that so far others haven't found a way to make glob work without nomatch, that's the best we got. We can also toggle it back before function exits, of course. Or we could just abandon shell ways and just use something else, like find for instance.
            – Sergiy Kolodyazhnyy
            yesterday










          • @Three I've revised the answer again. Probably this is the best I can do, as zsh seems to favor features instead of consistency. Hope this helps somewhat.
            – Sergiy Kolodyazhnyy
            yesterday










          • @SergiyKolodyazhnyy yes thanks - I would just avoid Zsh totally but its used on Manjaro - maybe I will avoid that too :)
            – Three
            yesterday


















          • @Three I've adapted the answer to check for zsh. Unfortunatelly for us zsh decided to go the weird way instead of similar behavior to bash or other shells, since according to POSIX: "If the pattern does not match any pathnames, the returned number of matched paths is set to 0, and the contents of pglob->gl_pathv are implementation-defined." source
            – Sergiy Kolodyazhnyy
            yesterday










          • turning nomatch everywhere risks breaking code that assumes the default (and very sensible) setting that sh and bash get wrong, so the change really should be localized only to this function
            – thrig
            yesterday










          • @thrig Well, considering that so far others haven't found a way to make glob work without nomatch, that's the best we got. We can also toggle it back before function exits, of course. Or we could just abandon shell ways and just use something else, like find for instance.
            – Sergiy Kolodyazhnyy
            yesterday










          • @Three I've revised the answer again. Probably this is the best I can do, as zsh seems to favor features instead of consistency. Hope this helps somewhat.
            – Sergiy Kolodyazhnyy
            yesterday










          • @SergiyKolodyazhnyy yes thanks - I would just avoid Zsh totally but its used on Manjaro - maybe I will avoid that too :)
            – Three
            yesterday
















          @Three I've adapted the answer to check for zsh. Unfortunatelly for us zsh decided to go the weird way instead of similar behavior to bash or other shells, since according to POSIX: "If the pattern does not match any pathnames, the returned number of matched paths is set to 0, and the contents of pglob->gl_pathv are implementation-defined." source
          – Sergiy Kolodyazhnyy
          yesterday




          @Three I've adapted the answer to check for zsh. Unfortunatelly for us zsh decided to go the weird way instead of similar behavior to bash or other shells, since according to POSIX: "If the pattern does not match any pathnames, the returned number of matched paths is set to 0, and the contents of pglob->gl_pathv are implementation-defined." source
          – Sergiy Kolodyazhnyy
          yesterday












          turning nomatch everywhere risks breaking code that assumes the default (and very sensible) setting that sh and bash get wrong, so the change really should be localized only to this function
          – thrig
          yesterday




          turning nomatch everywhere risks breaking code that assumes the default (and very sensible) setting that sh and bash get wrong, so the change really should be localized only to this function
          – thrig
          yesterday












          @thrig Well, considering that so far others haven't found a way to make glob work without nomatch, that's the best we got. We can also toggle it back before function exits, of course. Or we could just abandon shell ways and just use something else, like find for instance.
          – Sergiy Kolodyazhnyy
          yesterday




          @thrig Well, considering that so far others haven't found a way to make glob work without nomatch, that's the best we got. We can also toggle it back before function exits, of course. Or we could just abandon shell ways and just use something else, like find for instance.
          – Sergiy Kolodyazhnyy
          yesterday












          @Three I've revised the answer again. Probably this is the best I can do, as zsh seems to favor features instead of consistency. Hope this helps somewhat.
          – Sergiy Kolodyazhnyy
          yesterday




          @Three I've revised the answer again. Probably this is the best I can do, as zsh seems to favor features instead of consistency. Hope this helps somewhat.
          – Sergiy Kolodyazhnyy
          yesterday












          @SergiyKolodyazhnyy yes thanks - I would just avoid Zsh totally but its used on Manjaro - maybe I will avoid that too :)
          – Three
          yesterday




          @SergiyKolodyazhnyy yes thanks - I would just avoid Zsh totally but its used on Manjaro - maybe I will avoid that too :)
          – Three
          yesterday










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