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bigbadaboum

Member

Registered: 2022-12-22

Posts: 28

[SOLVED] Can Thunar Custom Action run .sh scripts?

I'm trying to convert all the WebP files in a folder to JPEG files using a Thunar custom action.

#!/bin/bash

for f in ./*.webp; do
    if [ -f "$f" ]; then
        basefilename="${f%.*}"
        newfilename="${basefilename}.jpg"
        if [ ! -f "$newfilename" ] ; then
            printf "Converting %s to %s " "$f" "$newfilename"
            convert -quality 55 "$f" "$newfilename"
            if [ -f "$newfilename" ]; then
            rm $f
            printf "...... Done!! \n"
            fi
        else
            printf "\n !!!File $s already exists !!!\n" $newfilename
            continue
        fi
    fi
done   
exit 0

source: https://www.thechubbyengineer.com/compu … es-to-jpg/

Can you help me?

Last edited by bigbadaboum (2026-06-15 19:16:40)

ToZ

Administrator

From: Canada

Registered: 2011-06-02

Posts: 12,644

Re: [SOLVED] Can Thunar Custom Action run .sh scripts?

Thunar custom actions work on mimetypes, like folder or image/webp. This means if you want to work on folders containing webp images and webp images directly, you'll need two separate custom actions.

Custom Action #1 - folders containing webp images

1. Create a script with the following content (and make it executable):

   #!/usr/bin/env bash
   
   for F in $@; do
           for f in "$F"/*.webp; do
                   basefilename="${f%.*}"
                   newfilename="${basefilename}.jpg"
                   convert -quality 55 "$f" "$newfilename"
                   rm "$f"
           done
   done

2. In the custom action, set the command to point to this script followed by "%F"

3. On the appearance tab, select "Directories"

4. To make it work, right-click on one or more directories containing webp files and select this custom action.

Custom Action #2 - webp image files

1. Create a script with the following content (and make it executable):

   #!/usr/bin/env bash
   
   for f in $@; do
           basefilename="${f%.*}"
           extension="${f##*.}"
           newfilename="${basefilename}.jpg"
           if [ "$extension" == "webp" ]; then
                   convert -quality 55 "$f" "$newfilename"
                   rm "$f"
           fi
   done

2. In the custom action, set the command to point to this script followed by "%F"

3. On the appearance tab, select "Images"

4. To make it work, right-click on one or more webp files and select this custom action.

Last edited by ToZ (2026-06-15 19:14:51)

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bigbadaboum

Member

Registered: 2022-12-22

Posts: 28

Re: [SOLVED] Can Thunar Custom Action run .sh scripts?

Your two tutorials work perfectly for me, thank you very much.

organicode

Member

Registered: 2026-04-01

Posts: 26

Re: [SOLVED] Can Thunar Custom Action run .sh scripts?

Congrats on solving the issue above.

Interested in the unspoken subtext of this topic. Why convert webp to jpg? Just interested to know out of curiousity, Because I thought webp has better quality for its lossy compression when compared to jpg. Assuming its a support based thing, I believe support for jpg is more widespread but i could be wrong, and dont want to assume. Just wondering if I'm missing something important (not online much these days due to modem issue).

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