Make lowercase rename

Quick, dirty and hacky PHP script (with a terrible project name).

Given a source directory, spits out to the console a bash script to recursively rename uppercase filenames to lowercased versions - basically a bunch of mv "sourcefile" "sourcefilelowercase" commands. It will not modify directories, only the files within.

Something I needed to lowercase around 30,000 digital camera images on a NAS drive which has a rather limited toolchain (BusyBox).

I'm sure I could have done this directly on the NAS using bash, but it proved easier/quicker to:

• Cobble this together
• Run script over NFS share to the files in question
• SCP result over to NAS as bash script
• Run bash script directly on the NAS from it's BusyBox shell

This will be little to zero use for anyone else but me.

Tested under PHP 7.2.x.

Usage

Note: The second optional argument --move-temp will first move the source file to a temp filename, then back to it's final lowercased filename. This defeats issues with broken filesystems, such as FAT32:

$ ./makelowercaserename.php \
  "/path/to/files" [--move-temp] >"/path/to/outbash.sh"

Or pass in an alternative command for mv via MVCMD:

$ MVCMD="git mv" \
  ./makelowercaserename.php \
  "/path/to/files" [--move-temp] >"/path/to/outbash.sh"