Basic Linux & Unix commands
100+ Important LINUX and UNIX Commands
100+ Important LINUX and UNIX Commands
- adduser ::-- Add a new user
- arch ::-- Print machine architecture
- awk ::-- Find and Replace text within file(s)
- bc ::-- An arbitrary precision calculator language
- cal ::--Display a calendar
- cat ::--Concatenate files and print on the standard output
- chdir ::--Change working directory
- chgrp ::--Change the group ownership of files
- chkconfig ::--Tool for maintaining the /etc/rc[0-6].d directory hierarchy
- chmod ::--Change the access permissions of files and directories
- chown ::--Change the user and group ownership of files
- chroot ::--Change root directory
- cksum ::--Print CRC checksum and byte counts
- clear ::--Clear terminal screen
- cmp ::--Compare two files
- comm ::--Compare two sorted files line by line
- cp ::--Copy one or more files to another location
- cron ::--Daemon to execute scheduled commands
- crontab ::--Schedule a command to run at a later time
- csplit ::--Split a file into context-determined pieces
- cut ::--Divide a file into several parts
- date ::--Display or change the date & time
- dc ::--Desk Calculator
- dd ::--Data Dump - Convert and copy a file
- df ::--Display free disk space
- diff ::-- Display the differences between two files
- diff3 ::--Show differences among three files
- dir ::--Briefly list directory contents
- dircolors ::-- Colour setup for `ls'
- dirname ::--Convert a full pathname to just a path
- du ::--Estimate file space usage
- echo ::-- Display message on screen
- ed ::-- A line-oriented text editor (edlin)
- egrep ::--Search file(s) for lines that match an extended expression
- eject ::--Eject CD-ROM
- env ::-- Display, set, or remove environment variables
- expand ::-- Convert tabs to spaces
- expr ::-- Evaluate expressions
- factor ::-- Print prime factors
- false ::-- Do nothing, unsuccessfully
- fdformat ::-- Low-level format a floppy disk
- fdisk ::-- Partition table manipulator for Linux
- fgrep ::-- Search file(s) for lines that match a fixed string
- find ::-- Search for files that meet a desired criteria
- fmt ::-- Reformat paragraph text
- fold ::-- Wrap text to fit a specified width
- format ::-- Format disks or tapes
- free ::-- Display memory usage
- fsck ::-- Filesystem consistency check and repair
- gawk ::-- Find and Replace text within file(s)
- grep ::-- Search file(s) for lines that match a given pattern
- groups ::-- Print group names a user is in
- gzip ::-- Compress or decompress named file(s)
- head ::-- Output the first part of file(s)
- hostname ::-- Print or set system name
- id ::-- Print user and group id's
- info ::-- Help info
- install ::-- Copy files and set attributes
- join ::-- Join lines on a common field
- kill ::-- Stop a process from running
- less ::-- Display output one screen at a time
- ln ::-- Make links between files
- locate ::-- Find files
- logname ::-- Print current login name
- lpc ::-- Line printer control program
- lpr ::-- Off line print
- lprm ::-- Remove jobs from the print queue
- ls ::-- List information about file(s)
- man ::-- Help manual
- mkdir ::-- Create new folder(s)
- mkfifo ::-- Make FIFOs (named pipes)
- mknod ::-- Make block or character special files
- more ::-- Display output one screen at a time
- mount ::-- Mount a file system
- mv ::-- Move or rename files or directories
- nice ::-- Set the priority of a command or job
- nl ::-- Number lines and write files
- nohup ::-- Run a command immune to hangups
- passwd ::-- Modify a user password
- paste ::-- Merge lines of files
- pathchk ::-- Check file name portability
- pr ::-- Convert text files for printing
- Printcap ::-- Printer capability database
- printenv ::-- Print environment variables
- printf ::-- Format and print data
- ps ::-- Process status
- pwd ::-- Print Working Directory
- quota ::-- Display disk usage and limits
- quotacheck ::-- Scan a file system for disk usage
- quotactl ::-- Set disk quotas
- ram ::-- ram disk device
- rcp ::-- Copy files between two machines
- rm ::-- Remove files
- rmdir ::- Remove folder(s)
- rpm ::-- Remote Package Manager
- rsync ::-- Remote file copy (Synchronize file trees)
- screen ::-- Terminal window manager
- sdiff ::-- Merge two files interactively
- sed ::-- Stream Editor
- select ::-- Accept keyboard input
- seq ::-- Print numeric sequences
- shutdown ::-- Shutdown or restart linux
- sleep ::-- Delay for a specified time
- sort ::-- Sort text files
- split ::-- Split a file into fixed-size pieces
- su ::-- Substitute user identity
- sum ::-- Print a checksum for a file
- symlink ::-- Make a new name for a file
- sync ::-- Synchronize data on disk with memory
- tac ::-- Concatenate and write files in reverse
- tail ::-- Output the last part of files
- tar ::-- Tape Archiver
- tee ::-- Redirect output to multiple files
- test ::-- Evaluate a conditional expression
- time ::-- Measure Program Resource Use
- touch ::-- Change file timestamps
- top ::-- List processes running on the system
- traceroute ::-- Trace Route to Host
- tr ::-- Translate, squeeze, and/or delete characters
- true ::-- Do nothing, successfully
- tsort ::-- Topological sort
- tty ::-- Print filename of terminal on stdin
- umount ::-- Unmount a device
- uname ::-- Print system information
- unexpand ::-- Convert spaces to tabs
- uniq ::-- Uniquify files
- units ::-- Convert units from one scale to another
- unshar ::-- Unpack shell archive scripts
- useradd ::-- Create new user account
- usermod ::-- Modify user account
- users ::-- List users currently logged in
- uuencode ::-- Encode a binary file
- uudecode ::-- Decode a file created by uuencode
- vdir ::-- Verbosely list directory contents (`ls -l -b')
- watch ::-- Execute/display a program periodically
- wc ::-- Print byte, word, and line counts
- whereis ::-- Report all known instances of a command
- which ::-- Locate a program file in the user's path
- who ::-- Print all usernames currently logged in
- whoami ::-- Print the current user name
- xargs ::-- Execute utility, passing constructed argument list(s)
- yes ::-- Print a string until interrupted
