wadermanasi/linux-cheat-sheet

Linux Cheat Sheet containing most of the Linux system commands.

💎 LINUX CHEATSHEET

☑️ Let's Hands-on the Linux Commands for working on Super Useful and Powerful Linux Command Line Interface (CLI) 🌀

********************** ⭕ LINUX SYSTEM COMMANDS ⭕ *********************************

• sudo :short name for "SuperUser Do" enables to perform tasks which require administrative or root permissions
• ls :list of directories
• stat :details of inode
• gcc file_name.c -o myexe :create object file while compilation and create separate excecutable
• mkdir :make new directory
• rmdir :remove directory
• rm :remove file
• touch :create new file
• make :runs the makefile (makefile: used to manage project)
• cd :enter into directory
• cp :copy files from current directory to diff directory
• pwd :prints current working directory
• cat file_name :list the contents of file
• mv file_name source dest :move file from source to destination
• find :searches for the files and directories
• df :to get report of system disk space usage (in % and kb)
• df -m :to get report of system disk space usage (in mb)
• du :to check space used by file or directory (in blocks)
• du -h :to check space used by file or directory (in bytes, kb and mb)
• tar :used to archieve multiple files
• chmod :to change read, write and execute permissions of file or directory
• ping :to check connectivity status (ping google.com)
• wget :to download required data from internet (eg wget download_link)
• uname :nothing but stands for Unix Name (tells the unix type you are using)
• history :gives list of commands used by you on terminal till date
• zip :zip multiple files
• unzip :unzip the zip folder
• clear :to clean out the terminal with all past commands (but it is still there in history)
• rm -rf .git :to remove hidden .git folder in linux

*********************** ⭕ LINUX SHUTDOWN COMMANDS ⭕ *********************************

• shutdown -h now :immediately power off & shutdown the system
• shutdown -h +5 :shutdown the system after 5 minutes
• shutdown -r now :reboot the system
• shutdown -Fr now :force file system check during reboot

*********************** ⭕ LINUX FUNCTIONS ⭕ *********************************

• stat(file_name,address of stat object) :gives information about file
• lstat(file_name(path)),address of stat object) :same as stat() but for symbolic links/soft links it returns info of link iself instead of target file
• fstat(file_descriptor,address of stat object) :gives metadata
• access(file_name,mode_of_permission) :return positive int if process has access of the requested mode/mode_of_permission
• opendir() :directory file handling
• readdir() :read contents of directory (data cannot be written in directory)
• closedir() :close the opened directory
• chmod(abs or rel path,mode)( :system call to change the file permisssions mode
• fchmod(file_descriptor,mode) :system call to change the file permisssions mode
• chdir(path) :<unistd.h> change the current working directory
• fchdir(fd) :same as above (both returns 0 on success & -1 on failure)