Add leading zeros to integer section of filename-CodePudding

I have folders of images with names like HolidaySnapsJune-1.tif , HolidaySnapsMay-12.tif and HolidaySnaps2018-005.tif

I want to add one leading 0 to the integer section of the filename if it is 2 digits long, and I want to add two leading 00s if it is just one digit long.

I would love to do this is a bash script which would recursively work on folders so it's important that the difference in names preceeding the '-' is ignored or worked-around.

I'm on Windows and just have access to whatever is built into git-bashso bash, sed, awk etc.

CodePudding user response：

You could use the rename.ul command from linux-utils.

rename [options] expression replacement file...

replaces the first occurence of expression by replacement in all names of files passed to the command.

Assuming your filenames contain exactly one hyphen -, you could simply run both of the following commands in a shell that supports the **/* glob syntax to recursively rename all files (Alternatively use find with the -exec option or something alike):

rename.ul -- - -00  **/*-?.tif
rename.ul -- - -0  **/*-??.tif

There are several options to rename.ul to prevent you from accidentally renaming inintended files (Watch out! The consequences could be quite drastic):

-v, --verbose
       Show which files were renamed, if any.

-n, --no-act
       Do not make any changes; add --verbose to see what  would
       be made.

-i, --interactive
       Ask before overwriting existing files.

So you could either run the commands with the -nv options to perform a dry-run and see what changes the program would make, or add -i to be asked each time a file would be renamed.

CodePudding user response：

Using sed

$ printf '%s\n' $(ls *) | sed '/\.tif/s/\(.*-\)\(\<[0-9]\{2\}\>.*\)/\mv \1\2 \10\2/e;s/\(.*-\)\(\<[0-9]\>.*\)/mv \1\2 \100\2/e'