Usage: mass-mv [OPTION...] [--] [ filename(s) ] Renames files en masse. Options: -a, --convert-all replace all runs of non-'[:alnum:].-' with '_' -c, --chop=string chop out a string (not a regex) -l, --lower lower case filenames -n, --dry-run just print what it would do -R, --recursive descend subdirectories -s, --sed=string pass old filename through a sed command (eg 's/asdasd/dfgdfg/') -S, --spaces remove spaces -u, --upper upper case filenames -v, --verbose be verbose -h, --help print this help message -V, --version print version and exit Mandatory or optional arguments to long options are also mandatory or optional for any corresponding short options.