Date: Tue, 1 Sep 2009 13:52:01 -0700 From: George Davidovich <freebsd@optimis.net> To: freebsd-questions@freebsd.org Subject: Re: remove newlines from a file Message-ID: <20090901205201.GA6126@marvin.optimis.net> In-Reply-To: <F2B402210EF1C4F7331B41C2@utd65257.utdallas.edu> References: <F2B402210EF1C4F7331B41C2@utd65257.utdallas.edu>
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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. -- George
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