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Checking if file exists and unzipping

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# 1  
Old 11-19-2012
Checking if file exists and unzipping
Hey, I am new to scripting and was wondering what is wrong with this if statement. I want to check if file exists and the if it does to unzip it. I program it as follows

Code:
if [ -e *_filename.gz ]; then
gunzip *_filename.gz 
fi

Thanks in advance!

Moderator's Comments:
Mod Comment Please use code tags next time for your code and data.
Last edited by joeyg; 11-19-2012 at 11:41 AM.. Reason: corrected spelling
# 2  
Old 11-19-2012
Try -f instead:-
Code:
if [ -f *_filename.gz ]; then

# 3  
Old 11-19-2012
The -f option does not work either! Smilie
# 4  
Old 11-19-2012
Works for me:-
Code:
# ls -l
-rwxr-xr-x   1 user    group         157 Nov 19 09:10 test1.gz
-rw-r--r--   1 user    group          39 Nov 19 10:39 test2.gz

# if [ -f *test*.gz ]
> then
>    echo Yes
> else
>    echo No
> fi
Yes

Code:
# rm -f *.gz
# if [ -f *test*.gz ]
> then
>    echo Yes
> else
>    echo No
> fi
No

What is your OS / Platform?
# 5  
Old 11-19-2012
This will fail in many systems because -f will get confused when given more than one argument.

I'd use a for-loop instead, breaking so it only runs once. Or not, if you want to run it over all files...

Code:
for FILE in *.gz
do
        if ! [ -f "$FILE" ] 
        then
                echo "No gz files"
       fi
       echo "$FILE exists"
       break
done

Last edited by Corona688; 11-19-2012 at 01:04 PM..
This User Gave Thanks to Corona688 For This Post:
only4satish
# 6  
Old 11-19-2012
Or you can use ls to check:-
Code:
if [ $( ls -l *_filename.gz 2> /dev/null | wc -l ) -ne 0 ]
then
      gunzip *_filename.gz
fi

# 7  
Old 11-19-2012
That is a useless use of ls *, running ls here is redundant. It will also cause error message spam when no files are present.
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