UNIX Commands 1/15/25

pwd

Print Working Directory; it displays the current directory path in the terminal.

man

Display the manual for a command; _ pwd

ls

List files and directories

clear

Clear the terminal screen

cat

Concatenate and display file contents

cat_>_[file] to edit or add data

head

Show the first few lines of a file

tail

Show the last few lines of a file

more

View file contents one screen at a time; more basic

less

View file contents with scrolling; more advanced

diff

Compare two files line by line

cd

Change the current directory

mkdir

Create new directories

rm

Remove files or directories

rmdir

Remove empty directories

cp

Copy files or directories

chmod

Change file permissions by using 3 digit code

Read: 4, Write: 2, Execute: 1

First digit: Owner’s permissions; Second digit: Group’s permissions; Third Digit: Others’ permissions

You add them based on what you want the permissions to be: 755, 777, 644, 600, 400

mv

Move or rename files and directories

wc

Count lines, words, and characters in a file

df

Display available disk space on file systems

top

Show real-time information about system processes

ps

List currently running processes

ps_aux allows for more information

grep

Search for patterns in files

egrep can be used for multiple patterns

sort

Sort lines of text in a file

paste

Merge lines of files