rename
rename
remove -n to actually rename things
2 digit padding
convert 1.mp3, 2.mp3 to 01.mp3, and 02.mp3
rename -n 's/^(\d+)(\.mp3)$/sprintf("%02d%s", $1, $2)/e' *.mp33 digit padding
rename -n 's/^(\d+)(\.mp3)$/sprintf("%03d%s", $1, $2)/e' *.mp3append / prepend numbered sequence
rename -n -X -N 00001 -e 's/.*/$N/' *.jpgrename to lowercase
rename -f 'y/A-Z/a-z/' *rename only file extension to lowercase
rename -f 's/([A-Z]+)$/\L$1/' *