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
again.
You're probably thinking of "Useful One-Line Scripts for Sed":
http://sed.sourceforge.net/sed1line.txt
A good follow-up:
http://www.osnews.com/story/21004/Awk_and_Sed_One-Liners_Explained
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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