remove newlines from a file
wblock at wonkity.com
Wed Sep 2 00:20:58 UTC 2009
On Tue, 1 Sep 2009, Steve Bertrand wrote:
> George Davidovich wrote:
>> On Tue, Sep 01, 2009 at 06:03:19PM +0000, Paul Schmehl wrote:
>>> I found a sed tutorial once that did this, but I can't seem to find it
>> You're probably thinking of "Useful One-Line Scripts for Sed":
>> A good follow-up:
>>> I have a file with multiple lines, each of which contains a single ip
>>> followed by a /32 and a comma. I want to combine all those lines into
>>> a single line by removing all the newline characters at the end of
>>> each line.
>>> What's the best/most efficient way of doing that in a shell?
>> A sed solution would be
>> sed -e :a -e '$!N; s/\n/ /; ta' my_file
>> Other (easier to remember) solutions could include:
>> tr -d '\n' < my_file
>> tr '\n' ' ' < my_file
>> echo $(cat my_file) # not so useless use of cat!
>> paste -s my_file
>> while read line; do
>> joined="$joined $(echo $line)"
>> done < my_file
>> echo $joined
>> Lots of options, of course. Even more with Perl.
> Yeah, how 'bout Perl:
> % perl -ne 's/\n/ /g; print;' < tests/ips.txt
perl -pe 'chomp' myfile
is somewhat easier. Works with Ruby, too.
-Warren Block * Rapid City, South Dakota USA
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