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who - display who is logged in and related data(processes, boot time).

whoami - Print the username associated with the current effective user ID.

Commands to create, delete, and modify groups.

zip - Package and compress (archive) files into zip file. You can use zipinfo command to list the files in zip format.

gzip - Compress/uncompress files with gzip compression. Compression reduces disk usage and transfer time. gzip is commonly used. the file created by gzip has ‘.gz’ extension.

tar - Archiving utility. Often combined with a compression method, such as gzip or bzip.

chgrp change group ownership for files and directories

chown - change file owner and group

chmod - change file mode bits.

Commands to create, delete, and modify users.

Explore -exec action for find command.

find - Find files or directories under the given directory tree, recursively.

locate - find files by name

whereis - locate the binary, source, and manual page files for a command

which - Locate a program in the user’s path.