Convert a bunch of BMP files to JPEG on Linux

"You can use ImageMagick's mogrify tool

mogrify -format jpg *.bmp"

"Let me do a little change to salmonmoose answer:

for i in `ls *.bmp`; do convert $i $i.jpg; done

The above works but generates files named ""bmp.jpg"". You can get .jpg files with this command:

for i in *.bmp; do convert ${i} ${i%bmp}jpg; done

See man bash for details of the for command. The ${i%bmp} part means the string ""${i}"" without the ""bmp"" substring at the end.

There are other operations to transform the string in ""${i}"". ""$i"" is a shorthand for ""${i}"". The ls *.bmp part in salmonmoose answer means ""execute ls *.bmp, then the for i part assigns each string separated by spaces to i"". The same is achieved by *.bmp because it matches all file names in the directory.

There is a drawback with for - if the files in your directory have spaces in the name, for example ""wedding picture 1.bmp"", it will be assigned 3 times to the i var, performing these commands:

convert wedding wedding.jpg
convert picture picture.jpg
convert 1.bmp 1.bmp.jpg

In my answer also the match ""${i%bmp}"" fails.

But there is a solution - you can use the find command instead. See man find for details. You should type something like the following (please check the syntax with the man page before trying it):

find -name *.bmp -type f -exec convert '{}' '{}'.jpg \;

(I am not very sure of the name part, and I have some doubt in the -exec part, see man find first)

If you want to join all the images in one .jpg file, you can concatenate them with other filter, as the one mentioned in the first answer."

"Recursive using find and ImageMagick's mogrify:
find . -iname *.bmp -exec mogrify -format png ""{}"" \;

The bmp files will remain in place."