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filename extension check - regular expression

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# 1  
Old 03-01-2007
filename extension check - regular expression
How to compare the file name for "zip" or "ZIP" extension.

I can put one more || condition to check the upper case in the below:
if [[ "`echo ${fileName} | cut -d'.' -f2`" = "zip" ]]; then

Is there any better way to compare using regular expressions.

Thx in advance.
# 2  
Old 03-01-2007
Try..
Code:
case $fileName in 
       *.ZIP|*.zip) echo true ;; 
       *) echo false ;; 
esac

# 3  
Old 03-01-2007
Quote:
Originally Posted by devs
How to compare the file name for "zip" or "ZIP" extension.

I can put one more || condition to check the upper case in the below:
if [[ "`echo ${fileName} | cut -d'.' -f2`" = "zip" ]]; then
You can get the suffix from a filename without using an external (i.e., slow) command:

Code:
suffix=${filename##*.}

... but it's not necessary to do that.

Quote:
Is there any better way to compare using regular expressions.
Use pattern matching (not regular expressions) in a case statement:

Code:
case $filename in
   *.[zZ][iI][pP]) true ;;
   *) false ;;
esac

# 4  
Old 03-02-2007
the below command will chop the extension of a given file and convert it into lowercase.You can put this in a test statement to compare the ext.

echo "${filename##*.}" | tr 'A-Z' 'a-z'
# 5  
Old 03-02-2007
Got it. Thank you all.
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