Common CLI Commands

Console and output management:
    cat - Display file contents on the terminal.
    clear - Clear the terminal display.
    echo - Print text or variables in the terminal.
    top - Get information about running processes.
Creating and exporting environment variables:
    env - Display all environment variables running on the system.
    export - Export environment variables.
    printenv - Print a particular environment variable to the console.
    source - Execute commands stored in a file from within the current shell, or refresh environment variables.
Working with files and directories:
    cd - Change to another directory.
    cp - Copy the contents of the source directory or file to a target directory or file.
    find - Locate a file or directory by name.
    grep - Search for a string within an output.
    ls - List the contents of a directory.
    mkdir - Create directories.
    more - View and traverse the content of a file or stdout.
    mv - Move or rename files.
    pwd - Get the name of the present working directory.
    rm - Delete files or directories.
    tar - Extract and compress files.
Accessing command-line help documentation:
    man - Access manual pages for all Linux commands.
Working with networks on and from a Linux computer:
    curl - Get or post a file to or from the Internet according to a URL.
    ip - Gets the IP information for the physical or virtual machine.
    netstat - Get information about network connections and more.
    ssh - Establish a secure encrypted connection between two hosts over an insecure network.
    wget - Direct download files from the Internet.
Process management:
    && - Execute commands in a sequence.
    kill - Removes a running process from memory.
    ps - Display active processes.
System control:
    poweroff - Shut down a computer.
    restart - Restart a computer.
User management:
    whoami - Display the user ID.

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sudo find -name

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Finds a file or directory by name.

Example:

The following command finds a file named hostname starting from the root (/) directory of the computer’s filesystem. Note that the command starts with sudo in order to access files restricted to the root user:

$ sudo find / -name hostname

/proc/sys/kernel/hostname

/etc/hostname

/var/lib/selinux/targeted/active/modules/100/hostname

/usr/bin/hostname

/usr/lib64/gettext/hostname

/usr/share/licenses/hostname

/usr/share/doc/hostname

/usr/share/bash-completion/completions/hostname

/usr/share/selinux/targeted/default/active/modules/100/hostname

/usr/libexec/hostname

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grep

$ less -N ~/.bashrc