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Reading extension of files

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# 8  
Old 06-05-2009
Code:
echo "file_name.sh" |  sed 's/.*\.\(.*\)/\1/'

will work for all.
# 9  
Old 06-05-2009
it is just a regex.
first of all i m modifying the solution.
pl refer to this

Quote:
echo "myfile.ext.ext" | sed 's/.*\.\([^.]*$\).*/\1/p'
it is searching for the pattern like this..

.* - anything
\. - literal dot.
[^.]*$ - anything after dot except dot at the end.
\(..\) - save the regex found
\1 - replace the regexp saved.

in previous solution i was first searching for the pattern.
# 10  
Old 06-05-2009
Quote:
Originally Posted by panyam
Code:
echo "file_name.sh" |  sed 's/.*\.\(.*\)/\1/'

will work for all.

Why do you use an external command when you can do it in the shell?

Code:
filename=file_name.sh
extension=${filename##*.}

# 11  
Old 06-05-2009
Code:
Why do you use an external command when you can do it in the shell?

since i am not good in bash programming. Have to learn a lot SmilieSmilie
# 12  
Old 06-05-2009
cfajohnson is right! You can even do it with tcsh:
Code:
set filename = file_name.xyz
echo $filename:e

# 13  
Old 06-05-2009
Code:
ls | sed 's/.*\.//'

# 14  
Old 06-05-2009
Quote:
Originally Posted by panyam
since i am not good in bash programming. Have to learn a lot

It's not just bash; it's the standard Unix (a.k.a POSIX) shell.
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