Programs which provide service to users are known as utility softwares.

Disk formatter: FDISK, format defragmenter disk checker: Fsck disk cleaner system profiler backup file system compression * Files and directories list directory: Ls, dir copy, move, remove: Cp, mv, rm, xcopy archive: Tar compression: Zip format conversion: Atob comparison: Diff sort: Sort * Security authentication: Login antivirus software: Avast, Norton Antivirus firewall: Zone Alarm, Windows … Read more