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cd (change directory) command is used to change the current working directory in Linux. Current working directory: Current working directory is also known as present working directory. It is a directory (folder) where the Use the pwd command to know current working directory / present working directory. pwd Syntax for cd command cd [option] directory_name […]

cp command in Linux/Unix cp command is used for copying files or directories from one location to another location. The copied files or directories are entirely independent of the original files or directories. Syntax of cp command cp [option] Source Destination Source can be one or more than one files or  directories as arguments Destination

Displays the checksum and byte count of a file cksum file   cksum file1 file2  

Cal command in Linux/Unix cal command is used in Linux to display the calender for a specific month or for a whole year in the terminal. Syntax of cal command cal [Month[Year]] Installing cal command Before installing the cal command, you should check whether the cal command is already installed or not. Write cal in

Apt is a command line package management utility for Ubuntu and Debian Linux. Apt is used to install, remove, update and upgrade Debian packages from command line in Ubuntu and Debian systems. Apt (Advanced package tool) overcomes the issues and bugs that were noticed in apt-get command. To use apt command user must have sudo

atq -v Uses of atq command with example To list all scheduled jobs use the command atq. You can also use at -l command to list all scheduled jobs instead of atq command. atq at -l If you are a root user, you can display the list of all scheduled jobs for a particular user.