Basics

We can see all cpu info using the command lscpu

man pages: Press h to get help on navigation, press q to quit and return to the command prompt, use the Up and Down arrow keys to scroll up and down, and the PgUp and PgDn keys to scroll one page at a time. KEYS WHICH CAN HELP IN NAVIGATION: apropos command: It is alias of the command man -k {half_remembered_cmd_name} → This command allows us to perform keyword search on manual pages incase we have forgot what the command name is. Note Before we run the keyword search we need to run the command mandb ...

Navigate Linux Directory Tree - Practice questions: Note Do it yourself, try to use the existing knowledeg you had learned from the chapter 1. If you get stuck , you can look into AI tools but don’t overuse them. ...

Main commands: Commands Short description ls -l Lists files in a long format showing permissions, owner, and size. ls -a Lists all files, including hidden ones (those starting with a dot). ls -ld Lists details of the directory itself rather than its contents. ls -lh Lists files in long format with file sizes in human-readable format (KB, MB). ls -lt Lists files sorted by modification time, newest first. ls -ltr Lists files sorted by modification time in reverse order (oldest first). ls -R Lists all files in the current directory and all subdirectories recursively. pwd Prints the full path of the current working directory. cd .. Moves one level up into the parent directory cd dir_name Changes the current directory to the specified folder cd ~ Moves directly to the current user’s home directory. cd - Switches back to the previous directory you were in. cd Shortcut to return to the home directory. tree -a Displays all files and directories in a tree structure, including hidden ones. tree -d Displays only directories in the tree structure. tree -h Displays the tree structure along with human-readable file sizes. tree -f Displays the full path prefix for each file in the tree. tree -p Displays the tree structure along with file permissions. tty Prints the file name of the terminal connected to standard input. uptime Shows how long the system has been running and the current load. clear Clears the terminal screen for a fresh workspace. which command_name Shows the full path of the executable for a command. whereis command_name Locates the binary, source, and manual page files for a command. type command_name Explains how a command name would be interpreted (alias, builtin, or file). uname Prints the name of the operating system kernel. uname -a Prints all available system information in one line. uname -s Displays the kernel name. uname -n Displays the network node hostname. uname -r Displays the kernel release version. uname -v Displays the kernel version date and build info. uname -m Displays the machine hardware architecture (e.g., x86_64). uname -p Displays the processor type or “unknown”. uname -i Displays the hardware platform or “unknown”. uname -o Displays the operating system name (e.g., GNU/Linux). lscpu Displays detailed information about the CPU architecture. man cmd_name Opens the official manual page for a specific command. man -k cmd_name Searches the manual descriptions for a specific keyword. appropos cmd_name Searches the manual pages for a keyword (same as man -k). cmd_name --help Displays a brief summary of a command’s options and usage. cmd_name -? An alternative flag used by some programs to show help. ls -l /usr/share/doc/cmd_name Checks for additional offline documentation files for a program.