Linux Commands
The following table is a list of linux commands found on a Redhat 9.0 server.

To see a list of bash shell commands, go to the shell commands page.
For those of you who are unsure how to use linux commands, see our Linux Commands Tutorial.

Click on the command name or the to see a description of the command.
Click on the to see the man page for that command.

Command
Description

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 id and name (`id -un')


xargs Execute utility, passing constructed argument list(s)


yes Print a string until interrupted

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