Secure rm (srm) is a command-line compatible rm(1) which completely destroys file contents before unlinking. The goal is to provide drop in security for users who wish to prevent command line recovery of deleted information, even if the machine is compromised.
You can download it from the following link: https://packetstormsecurity.com/files/download/124765/srm-1.2.12.tar.gz
Source: https://packetstormsecurity.com/files/124765/Secure-rm-1.2.12.html