Operating on Files Dired Transforming File Names
The dired command ! (
dired-do-shell-command) reads a shell
command string in the minibuffer and runs that shell command on all the
specified files. You can specify the files to operate on in the usual
ways for Dired commands (see Operating on Files). There are two
ways of applying a shell command to multiple files:
*' in the shell command, then it runs just once, with the list of file names substituted for the `
*'. The order of file names is the order of appearance in the Dired buffer.
Thus, ! tar cf foo.tar *
tar on the entire
list of file names, putting them into one tar file `
*', then it runs once for each file, with the file name added at the end.
For example, ! uudecode
uudecode on each
What if you want to run the shell command once for each file but with
the file name inserted in the middle? Or if you want to use the file
names in a more complicated fashion? Use a shell loop. For example,
this shell command would run
uuencode on each of the specified
files, writing the output into a corresponding `
for file in *; do uuencode $file $file >$file.uu; done
The working directory for the shell command is the top-level directory of the Dired buffer.
The ! command does not attempt to update the Dired buffer to show new or modified files, because it doesn't really understand shell commands, and does not know what files the shell command changed. Use the g command to update the Dired buffer (see Dired Updating).Operating on Files Dired Transforming File Names