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Including case insensitivity into loop command

 
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# 1  
Old 09-02-2009
Including case insensitivity into loop command
I have the following piece of code:
Code:
for file in *csv; do cat $file >> $newfile; done
for file in *CSV; do cat $file >> $newfile; done

and would like to know how to combine these two rules into one? The combined rule would then include the case insensitivity that I am looking for.
# 2  
Old 09-02-2009
Quote:
Originally Posted by figaro
Code:
for file in *csv [...]
for file in *CSV [...]

One way:

Code:
for file in *csv *CSV [...]

# 3  
Old 09-02-2009
That is great, thanks.
# 4  
Old 09-02-2009
Why run cat dozens of separate times in a shell loop when you could just run it once with no loop at all? concatenating files is what cat is for. Smilie It can of course accept multiple arguments.

Code:
cat *.csv *.CSV >> $newfile

If you're worried about there being too many arguments for commandline parameters to handle, I don't think a loop will help, you'll need to use a pipe.
Code:
# ls -1, as in one, not L
ls -1 | grep -i '\.csv$' | xargs --no-run-if-empty cat >> $newfile

Last edited by Corona688; 09-02-2009 at 01:13 PM..
# 5  
Old 09-02-2009
@Corona688: thank you for your answer, but those specific lines were actually taken from one of the posts on this forum, but your suggestion seems worthwhile and is actually rather quick.
 
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