[SOLVED] shell script for editing file extensions

David the H. · 04-28-2012, 04:45 AM

Or, if you apply the suggestions I gave in my last post, like this:

Code:

#!/bin/bash

extension="$1"
shift

for fname in "${@}" ; do

     if [[ -r "$fname" ]] ; then

          newname="${fname%.*}.$extension"

          ##This is the test to prevent mv from siting an error
          if [[ "$fname" == "$newname" ]] ; then

               :

          else

               mv -f "$fname" "${fname%.*}.$extension"

          fi

     else

          echo "$fname: No such file"

     fi

done

R2B Boondocks · 11-12-2012, 10:03 PM

Hi I came across this post and it has helped me greatly. I am still having trouble with the final shell script though.
"
Finally, within the same directory, create a shell script, chExt.sh that takes one or more parameters, where the first is a desired extension and the remainder are names of files to be renamed. For each file in the command line, this script should rename the file, as above, if the file exists or print the error message described in the previous step if the file does not exist.
For example,

ls > crocodile.foo
echo bark > dingo.bar
./chExt.sh dat crocodile.foo bogusName.foo dingo.bar

should result in crocodile.foo being renamed crocodile.dat, an error message "bogusName.foo: No such file", and dingo.bar being renamed dingo.dat.
"

This is the script so far:

Code:

#!/bin/sh
extension="$1"
shift
for fname in "${@}" ; do
    mv "$fname" "${fname%.*}.$extension"
if test -r "$fname" ; then
newname="${fname%.*}.$extension"
if test "$fname" = "$newname" ; then  ##This is the test to prevent mv from sit\
ing an error
:
else
mv -f "$fname" "${fname%.*}.$extension"
fi
else
echo "$fname": No such file
fi

done

This gives me the following errors:

./chExt.sh 'cpp' 'aardvark.CPP' 'bongo.dat'
mv: cannot stat `aardvark.CPP': No such file or directory
aardvark.CPP: No such file
mv: cannot stat `bongo.dat': No such file or directory
bongo.dat: No such file

Thanks for all help!

catkin · 11-12-2012, 10:32 PM

R2B Boondocks question is answered in their LQ thread here.