Error handling in shell script

Question

I have the following the shell script. Which throws the following error if there is no file exist in the folder. So, how we do handle this so that script doesn't stop executing?

Error:

   mv: cannot stat `*': No such file or directory

Script:

for file in *
    do
        fl=$(basename "$file")            
        flname="${fl%%.*}"              
        gunzip "$file"
        mv "$flname" "$flname-NxDWeb2" 
        tar -zcf "$flname-NxDWeb2".tar.gz "$flname-NxDWeb2"
        rm "$flname-NxDWeb2"   
done;

Toby Speight · Accepted Answer · 2015-06-04 14:21:05Z

2

If the shell is bash, you can allow * to expand to the null string: shopt -s nullglob before your loop.

BTW, you might want to explicitly specify the uncompressed filename to produce, in case your logic doesn't completely agree with gunzip's (which it probably won't, if there's more than one dot in the name, or the file ends with .tgz or .taz):

gunzip -c "$file" >"$flname"

(you will need to remove the original yourself in this case, though)

You can avoid the need to move, too:

flname="${fl%%.*}-NxDWeb2"

And you might want to use trap to ensure your temporaries are cleaned up in the failure case (possible make your temporaries in $TMPDIR, too).

answered Jun 4, 2015 at 14:21

Toby Speight

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