Recursively rename files - oneliner preferably [duplicate]

find . -name '*.txt' -print0 | xargs -0 -n1 bash -c 'mv "$0" "${0/oldname/newname}"'

Obviously, that rename pattern is just a simple example, but beware that as is it will edit the whole path, not just the filename.

the mmv command will do this in a rather simple call:

mmv ";name_1.txt" "#1name_2.txt"

The ";" wildcard, which is reused in the replacement filename as "#1" matches also subdirectories.

If you need more complicated examples, you should look into the man-page.

As @ams points out, many recursive replace solutions require you to work with the whole path, not just the file name.

I use find's -execdir action to solve this problem. If you use -execdir instead of -exec, the specified command is run from the subdirectory containing the matched file. So, instead of passing the whole path to rename, it only passes ./filename. That makes it much easier to write the replace command.

find /the/path -type f \
               -name '*_one.txt' \
               -execdir rename 's/\.\/(.+)_one\.txt$/$1_two.txt/' {} \;

In detail:

• -type f means only look for files, not directories
• -name '*_one.txt' means means only match filenames that end in _one.txt
• In this answer, I'm using the rename command instead of mv. rename uses a Perl regular expression to rename each file.
• The backslashes after -type and -name are the bash line-continuation character. I use them to make this example more readable, but they are not needed in practice.
• However, the backslash at the end of the -execdir line is required. It is there to esacpe the semicolon, which terminates the command run by -execdir. Fun!

Explanation of the regex:

• s/ start of the regex
• \.\/ match the leading ./ that -execdir passes in. Use \ to escape the . and / metacharacters
• (.+) match the start of the filename. The parentheses capture the match for later use
• _one\.txt match "_one.txt", escape the dot metacharacter
• $ anchor the match at the end of the string
• / marks the end of the "match" part of the regex, and the start of the "replace" part
• $1 references the existing filename, because we captured it with parentheses. If you use multiple sets of parentheses in the "match" part, you can refer to them here using $2, $3, etc.
• _two.txt the new file name will end in "_two.txt". No need to escape the dot metacharacter here in the "replace" section
• / end of the regex

Before

tree --charset=ascii

|-- a_one.txt
|-- b_one.txt
|-- Not_this.txt
`-- dir1
    `-- c_one.txt

After

tree --charset=ascii

|-- a_two.txt
|-- b_two.txt
|-- Not_this.txt
`-- dir1
    `-- c_two.txt

Hint: rename's -n option is useful. It does a dry run and shows you what names it will change, but does not make any changes.