Xing's Blog

top - display dynamic real-time view of the system summary info as well as a list of tasks currently being managed by the Linux kernel.

wc - print newline, word, and byte counts for each file

ps - display current processes. ps is short for Process Status.

id - display current user and group identity.

su - Switch shell to another user.

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.