Note: ^ M input method is to press Ctrl V first and press Enter
The first
$ perl -i -p -e "s / ^ m //g" * .txt or $ perl -i.bak -p -e "s / ^ m // g" * .txt # is also .bak as Suffix name plus a backup file
Second type (JLAKE)
Compared to the original, use VI to open
Press ESC to enter the command mode, type: 1, $ s / ^ m //g Enter
