3-1. Linux Commands and Tools

Basic Linux Commands

change directory

cd path

List command

ls [parameters]

-l : detailed listing view (e.g. owner, date, permission)
-a : include hidden files

move

mv original_filepath target_filepath

copy

cp original_filepath target_filepath

sudo

sudo "Linux command"

pwd

pwd (current location)

mkdir

mkdir new_folder_name

// making new directory

touch

touch new_file_name

shutdown

shutdown

//reboot or shut down linux system

passwd

// change the password for a user
passwd

// change another user's password
sudo passwd username

ps

ps

-A : print all processes
-f : show in full format (UID, PID, etc.)
// process status is used to provide information about the currently running processes, including their process identification numbers

grep

grep "text" [file]

// linux command to search text and string in a given file

Ex. grep printf filename   // search for a string in the target file
Ex. grep printf filename*  // search for a string in all files in the current directory

kill

kill PID

// terminate a process from the command line

apt

apt options

// apt works Ubuntu's Advanced Packaging Tool (APT)
Ex. options
update
upgrade
install "something"
remove "something"

ssh

ssh user_account@server_domain or IP_address

// make a connection to a remote Linux computer and log into user account

tar

tar -options file_path

Ex. options
-cvf : when compressing
-xvf : when extracting

top

top

// top is used to show the Linux processes
// It provides a dynamic real-time view of the running system

uname

uname

-a : see everything
-r : see the kernel release

// computer program in Unix and Unix-like computer operating systems that prints the name, version, and other details about the current machine and the operating system running on it.

history

history

// lists the commands you have previously issued on the command line

less

less file_path

// like vi
// view files without operating an editor

man

man [linux_command]

Ex. man ps
Ex. man top

// displays the manual pages for a command

ctags

sudo apt install ctags
ctags -R

// a programming tool that generates an index (or tag) file of names found in source and header files

cscope

sudo apt install cscope
cscope

// a programming tool used on very large projects to find source code, functions, declarations, definitions and regular expressions