How to use the a and i command in Gnu sed to add a newline character using n?












2














In below example, I can use the literal newline characters to add an empty line before and after 3. Is it possible to use n instead? I'm using Gnu sed 4.5.



root@u1804:~# seq 5 | sed -r -e '/3/{i

> ' -e 'a

> ' -e '}'

1

2



3



4

5

root@u1804:~#





sed







share|improve this question






















  • Haha, sorry to bother you again. I'm learning sed right now and I just want to make the command a little bit cleaner. If I can use n instead of a literal newline, I can write the command in a single line, which will make it easy to type and read.
    – Ogrish Man
    yesterday
















2














In below example, I can use the literal newline characters to add an empty line before and after 3. Is it possible to use n instead? I'm using Gnu sed 4.5.



root@u1804:~# seq 5 | sed -r -e '/3/{i

> ' -e 'a

> ' -e '}'

1

2



3



4

5

root@u1804:~#





sed







share|improve this question






















  • Haha, sorry to bother you again. I'm learning sed right now and I just want to make the command a little bit cleaner. If I can use n instead of a literal newline, I can write the command in a single line, which will make it easy to type and read.
    – Ogrish Man
    yesterday














2












2








2







In below example, I can use the literal newline characters to add an empty line before and after 3. Is it possible to use n instead? I'm using Gnu sed 4.5.



root@u1804:~# seq 5 | sed -r -e '/3/{i

> ' -e 'a

> ' -e '}'

1

2



3



4

5

root@u1804:~#





sed







share|improve this question













In below example, I can use the literal newline characters to add an empty line before and after 3. Is it possible to use n instead? I'm using Gnu sed 4.5.



root@u1804:~# seq 5 | sed -r -e '/3/{i

> ' -e 'a

> ' -e '}'

1

2



3



4

5

root@u1804:~#





sed




sed






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked yesterday









Ogrish ManOgrish Man

5251415




5251415












  • Haha, sorry to bother you again. I'm learning sed right now and I just want to make the command a little bit cleaner. If I can use n instead of a literal newline, I can write the command in a single line, which will make it easy to type and read.
    – Ogrish Man
    yesterday


















  • Haha, sorry to bother you again. I'm learning sed right now and I just want to make the command a little bit cleaner. If I can use n instead of a literal newline, I can write the command in a single line, which will make it easy to type and read.
    – Ogrish Man
    yesterday
















Haha, sorry to bother you again. I'm learning sed right now and I just want to make the command a little bit cleaner. If I can use n instead of a literal newline, I can write the command in a single line, which will make it easy to type and read.
– Ogrish Man
yesterday




Haha, sorry to bother you again. I'm learning sed right now and I just want to make the command a little bit cleaner. If I can use n instead of a literal newline, I can write the command in a single line, which will make it easy to type and read.
– Ogrish Man
yesterday










1 Answer
1






active

oldest

votes


















5














If you use n it will work but you'll end up with two newlines before and after as the commands i and a already add a newline before and respectively after the pattern space is printed so



seq 5 | sed  -e '3i\n' -e '3a\n'


prints



1

2





3





4

5


If, for some reason, you want it in one-line you can use multiple -expressions:



seq 5 | sed  -e '3{i' -e '' -e 'a' -e '' -e '}'


though in this case it's easier/shorter to just use the hold space:



 seq 5 | sed  '3{G;H;x;}'





share|improve this answer

















  • 1




    ... or (with GNU sed) {G;H;z;x;} if you need the hold space to be returned to its initial - empty - state after
    – steeldriver
    yesterday











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1 Answer
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active

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1 Answer
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active

oldest

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active

oldest

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oldest

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5














If you use n it will work but you'll end up with two newlines before and after as the commands i and a already add a newline before and respectively after the pattern space is printed so



seq 5 | sed  -e '3i\n' -e '3a\n'


prints



1

2





3





4

5


If, for some reason, you want it in one-line you can use multiple -expressions:



seq 5 | sed  -e '3{i' -e '' -e 'a' -e '' -e '}'


though in this case it's easier/shorter to just use the hold space:



 seq 5 | sed  '3{G;H;x;}'





share|improve this answer

















  • 1




    ... or (with GNU sed) {G;H;z;x;} if you need the hold space to be returned to its initial - empty - state after
    – steeldriver
    yesterday
















5














If you use n it will work but you'll end up with two newlines before and after as the commands i and a already add a newline before and respectively after the pattern space is printed so



seq 5 | sed  -e '3i\n' -e '3a\n'


prints



1

2





3





4

5


If, for some reason, you want it in one-line you can use multiple -expressions:



seq 5 | sed  -e '3{i' -e '' -e 'a' -e '' -e '}'


though in this case it's easier/shorter to just use the hold space:



 seq 5 | sed  '3{G;H;x;}'





share|improve this answer

















  • 1




    ... or (with GNU sed) {G;H;z;x;} if you need the hold space to be returned to its initial - empty - state after
    – steeldriver
    yesterday














5












5








5






If you use n it will work but you'll end up with two newlines before and after as the commands i and a already add a newline before and respectively after the pattern space is printed so



seq 5 | sed  -e '3i\n' -e '3a\n'


prints



1

2





3





4

5


If, for some reason, you want it in one-line you can use multiple -expressions:



seq 5 | sed  -e '3{i' -e '' -e 'a' -e '' -e '}'


though in this case it's easier/shorter to just use the hold space:



 seq 5 | sed  '3{G;H;x;}'





share|improve this answer












If you use n it will work but you'll end up with two newlines before and after as the commands i and a already add a newline before and respectively after the pattern space is printed so



seq 5 | sed  -e '3i\n' -e '3a\n'


prints



1

2





3





4

5


If, for some reason, you want it in one-line you can use multiple -expressions:



seq 5 | sed  -e '3{i' -e '' -e 'a' -e '' -e '}'


though in this case it's easier/shorter to just use the hold space:



 seq 5 | sed  '3{G;H;x;}'






share|improve this answer












share|improve this answer



share|improve this answer










answered yesterday









don_crisstidon_crissti

50k15132161




50k15132161








  • 1




    ... or (with GNU sed) {G;H;z;x;} if you need the hold space to be returned to its initial - empty - state after
    – steeldriver
    yesterday














  • 1




    ... or (with GNU sed) {G;H;z;x;} if you need the hold space to be returned to its initial - empty - state after
    – steeldriver
    yesterday








1




1




... or (with GNU sed) {G;H;z;x;} if you need the hold space to be returned to its initial - empty - state after
– steeldriver
yesterday




... or (with GNU sed) {G;H;z;x;} if you need the hold space to be returned to its initial - empty - state after
– steeldriver
yesterday


















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