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How to add a line break in a pipe received output, using sed, only for cases that fit the established pattern?
I used sed "s/.*oo.*/&\n/" unsuccessfully. The pattern is OK, but the addition of the new line is not. I need to know what to put there where it is \n.
Examples of results I hope:
Sem Match:
echo 'bravo bar' | sed "s/.*oo.*/&\n/"
expected output:
bravo bar
Match:
echo 'foo bar' | sed "s/.*oo.*/&\n/"
expected output:
foo
bar
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& represents ALL the string that matches the pattern, so you’re just adding a line break to the end of the line.
This generates the expected output here:
echo 'foo bar' | sed 's/\(.*oo\) \(.*\)/\1\n\2/g'
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Use sed 's/.*oo.*/&\'$'\n/g' but to catch foo you need to improve the standard:
echo 'foo bar' | sed 's/.*oo/&\'$'\n/g'
'Cause you need that part: '$'?
worked. Thank you
The $ indicates the inclusion of a new line which is complemented with \n
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Using Gnu-sed (present in linux and easy to install everywhere, and to times with the name gsed) the example proposed by OP works with slight modification:
sed echo 'foo bar' | sed 's/.*oo/&\n/'
output
foo
bar
@Henriquebarcelos presented some richer examples with reuse of substrings which obviously works very well on Gnused.
To highlight the potentiality of this issue, I put together a slightly more complex example that changes site line breaks:
Given a text with broken words:
$ cat texto
Exemplo
aqui vai um tex-
to que tem trans-
lineações a dar
com um pau!
move word continuation to the previous line!
$ sed -zre 's/-\n([^ ]+) /\1\n/g' texto
Exemplo
aqui vai um texto
que tem translineações
a dar
com um pau!
Browser other questions tagged regex bash command-line
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The output of your command is:
foonbar– neoprofit
It’s not no... Tested before posting.
– Henrique Barcelos
In which OS? In OS X the result is
foonbar– neoprofit
That’s why on Mac the line break is
\r, nay\n. Just make the switch to work.– Henrique Barcelos
if I switch to r
foorbar– neoprofit
I’ve never used OS X, it’s probably some question with Escaping. Try with
\\rand see the result.– Henrique Barcelos
I’ll use the other answer, but thanks anyway!
– neoprofit
But it works with
\\r? Now even I want to know the answer– Henrique Barcelos
output:
foo\rbar– neoprofit
the standard version of
sedin OS X is not thegnu sed, so the differences in output. Output works as expected ingnu sed. Out of curiosity, theseddefault on OS X is the same as found on Freebsd.– Bruno Coimbra
@Brunocoimbra, this is always a headache! Fortunately the homebrews and the like have the gnused version of easy installation. In some cases the Macs have gnused installed with the name gsed or gnused. gnused (and gnu awk) functionality is significantly richer.
– JJoao