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How to remove last character only if it's there?

input:

OpenOffice.org/m
openOffice.org/ozm
Pers.
Pfg.
phil.
Prof.
resp.
Roonstr./m
roonstr./ozm

desired output:

OpenOffice.org
openOffice.org
Pers
Pfg
phil
Prof
resp
Roonstr
roonstr

I got it so far that only the dot is left but unfortunately the last sed command removes also letter g too: $ cat filename | grep "\." | cut -d"/" -f1 | sed 's/.$//'

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1 Answer

up vote 4 down vote accepted

You just need to escape the dot in your sed command and everything will be fine. Like this:

sed 's/\.$//'

Because in the case you don't escape it, .$ will match to any character at the end of string.

Also you can put all your sed + grep + cut into just one sed:

sed 's=/[^/]*$==;s/\.$//' filename
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Great, thanks, works! :) I use a dictionary with over 300k lines so this is why I use grep "\." to get only the words with a dot there. –  removelastdotonlyifitsthere Aug 15 '12 at 7:27
    
sed also can do it with smth like this: sed -n '/\./{s=/[^/]*$==;s/\.$//;p}. Anyway grep + sed will work much longer than just one sed. –  rush Aug 15 '12 at 7:33
    
If it can be done with one sed it would be nice though. How to apply your last sed command? –  removelastdotonlyifitsthere Aug 15 '12 at 7:36
    
sed 's/[./]\+[^./]*$//' –  Peter.O Aug 15 '12 at 7:36
    
Thanks now I don't need cut, but grep is still there. A sed equivalent of my piped grep command would then remove the grep to,if it's possible, it would be nice. "Also you can put all your sed + grep + cut into just one sed" doesn't work for me, prints all the words? –  removelastdotonlyifitsthere Aug 15 '12 at 7:41
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