Say I have the following files:
foo.coffee
foo.js
bar.js
Is there an easy way how to rm *.js if there's a corresponding .coffee file? In the example such a command would remove foo.js leaving:
foo.coffee
bar.js
I'm looking for some sort of a rm wrap as I need to do a recursive rm -r.
A little bit of bash (using all the best practices!):
shopt -s nullglob
for f in *.js; do
coffee=${f%.js}.coffee
[[ -f $coffee ]] && rm -v -- "$f"
done
nullglob is a shell optional behavior so that *.js will expand to the empty string if there are no files with extension js..js and replace it with .coffee in the variable coffee.rm is used with the -v switch (verbose) so that you see what's happening.rm is also used with -- that marks the end of options, just in case there's a file that starts with a hyphen: in that case, rm would be confused and try to interpret an option.[[ ... ]] construct is a conditional construct and uses conditional expressions. Notice I'm using the robust double square bracket [[ and not the single [. Very good practice (in bash).For testing purposes, you should put echo in front of rm:
[[ -f $coffee ]] && echo rm -v -- "$f"
so that it only echoes the command and doesn't remove anything. When you're happy with that, remove the echo.
Enjoy!
