Explain the following commands in UNIX:suid, wall, man, finger, ls, cat, ps, grep, sort, chmod

suid: This stands for "Set User ID". It is a special type of file permissions given to a file. Normally in Linux/Unix, when a program runs, it inherits access permissions from the logged in user. SUID is defined as giving temporary permissions to a user to run a program/file with the permissions of the file owner rather that the user who runs it.

wall: The 'wall' command in UNIX is used to broadcast a message to all users in a terminal session. This can be useful for system administrators who need to alert users about system downtime or issues.

man: The 'man' command is short for manual. This command is used to display the user manual of any command that we can run on the terminal. It provides a detailed view of the command which includes NAME, SYNOPSIS, DESCRIPTION, OPTIONS, EXIT STATUS, RETURN VALUES, ERRORS, FILES, VERSIONS, EXAMPLES, AUTHORS and SEE ALSO.

finger: The 'finger' command is used in Unix and Unix-like operating systems to get information about a particular user, such as login name, full name, and details about when the user last logged in.

ls: The 'ls' command is used to list the contents of a directory. By default, this will display the contents of the current directory.

cat: The 'cat' (short for “concatenate") command is one of the most frequently used command in Linux/Unix, Apple Mac OS X operating systems. 'cat' command allows us to create single or multiple files, view contain of file, concatenate files and redirect output in terminal or files.

ps: The 'ps' command, short for "process status", is used in Unix and Unix-like operating systems to display information about active processes.

grep: The 'grep' command, which means "global regular expression print," processes text line by line and prints any lines which match a specified pattern.

sort: The 'sort' command is used to sort the lines in a text file. You can sort the file in alphabetical order, reverse order, or numerical order.

chmod: The 'chmod' command, short for "change mode", is used to change the access permissions of file system objects. It is used to make a file executable, to change the read, write, and execute permissions of files and directories.