my input:
ads bdsd cds dds
ac cv ss ds
dsd
output I expect:
ads
bdsd
cds
dds
ac
cv
ss
ds
dsd
command I used:
cat file1.txt | perl -p -i -e 's/\n(.+)/$1/'
but it does not work
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oguz ismail
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Oh God
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Perl is decidedly overkill here. The basic problem is that `.+` matches the entire line, including whitespace. You probably meant something like `s/\n?(\S+)\s+/$1\n/g` – tripleee Oct 21 '22 at 11:03
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Also, the `-i` option makes no sense when the data comes from standard input. – tripleee Oct 21 '22 at 11:04
1 Answers
0
Try this:
cat file1.txt | tr -s " " "\n"
Basically, it replaces spaces with newlines and removes empty lines.
sudoer
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1That's a [useless `cat`](https://stackoverflow.com/questions/11710552/useless-use-of-cat); you want `tr " " "\n" < file1.txt` – tripleee Oct 21 '22 at 11:00
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You can squeeze the whitespace with `-s`: `tr -s ' ' \\n` will do it all. – William Pursell Oct 21 '22 at 11:07