Srm
securely remove files or directories.
DESCRIPTION
srm removes each specified file by overwriting, renaming, and truncating it before unlinking. This prevents other people from undeleting or recovering any information about the file from the command line. By default srm uses the simple mode to overwrite the file's contents. You can choose a different overwrite mode with --dod, --doe, --openbsd, --rcmp, --gutmann. If you specify more than one mode option, the last option is used.