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Home : Linux : Commands : Linux Commands
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
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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
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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
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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
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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
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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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