SJ
LinuxCommandsCheatSheet
Searching
Hardware Information
File Commands
System Management and Info
Disk Usage
dmesg
Show bootup messages
grep [pattern] [file]
Search for a pattern in a file
ls
List files in the directory
uname -r
Show system information
df -h
Show free space on system
cat /proc/cpuinfo
Show CPU information
grep -r [pattern] [directory]
Search a pattern recursively
ls -a
List files, include hidden files
uname -a
Show kernel release info
df -l
Show free nodes on system
free -h
Show free and used memory
locate [name]
Search for files & directories
pwd
Show current directory
uptime
Show uptime length/avg. load
fdisk -l
Disk partition types and sizes
lshw
Hardware configuration info
find [/location] -name [x]
List items beginning with [x]
mkdir [name]
Create a directory
hostname
Show system hostname
du -ah
Show disk usage for all files
lsblk
Block devices info
find [/location] -size [+100M]
List items larger than 100MB
rm [file]
Remove a file
hostname -l
Show system IP address
du -sh
Show disk usage for current
directory
lspci -tv
Tree-diagram of PCI devices
rm -r [directory]
Recursively remove directory
last reboot
Show reboot history
findmnt
Show target mount point
mount [device] [mount_point]
Mount a device
lsusb -tv
File Transfer
Tree-diagram of USB devices
dmidecode
Show BIOS hardware info
hdparm -i /dev/[disk]
Show disk data info
hdparm -tT /dev/[disk]
Disk read speed test
badblocks -s /dev/[disk]
Unreadable blocks test
scp [file.txt] [server/tmp]
Securely copy file to server
rsync -a [/location] [/backup/]
Sync the contents of a
location with the backup
directory
Process Related
File Compression
tar cf [file.tar] [file]
whoami
Show current user
ln -s [/path/file] [link]
Create a symbolic link to file
finger [username]
Show user information
let "[variable]=[value]"
Assign integer value to var
touch [file]
Create a new file
ulimit [flags] [limit]
View or limit system resources
export [variable]
Export a Bash variable
more [file]
Show file contents
shutdown [hh:mm]
Schedule a system shut down
declare [variable]="[value]"
Declare a Bash variable
echo $[variable]
Display value of the variable
pmap
Show process memory usage
gpg -c [file]
Encrypt a file
top
Show all running processes
gpg [file.gpg]
Decrypt a file
kill [process_id]
Kill the process by ID
wc
Count words/lines/bytes
pkill [process_name]
Kill the process by name
killall [process_name]
Kill all processes by name
fg [job]
Bring [job] to foreground
Install a package with DNF
List files opened by processes
lsof
Install a local rpm package
trap "[commands]" [signal]
Execute command on signal
Remove an rpm package
wait
Pause terminal until process
completes
Install a package with APT
nohup [command] &
ls | xargs wc
cut -d[delimiter] [file]
[data] | cut -d[delimiter]
awk '[pattern] {print $0}' [file]
shred -u [file]
Cut file section and print
ip addr show
Show IP addresses
alias [alias]='[command]'
Create command alias
ip address add [ip]
Assign IP address to interface
watch -n [interval] [command]
Set interval to run a command
ifconfig
Show all network interfaces
sleep [interval] && [command]
Postpone command execution
netstat -pnltu
Show active listening ports
at [hh:mm]
Schedule a job
netstat -nutlp
Show tcp and udp ports
man [command]
Display command manual
whois [domain]
Show domain information
history
Print command history
dig [domain]
Show domain's DNS info
dig -x [host]
Domain reverse lookup
dig -x [ip]
IP address reverse lookup
Cut data section and print
Print lines matching a pattern
Overwrite and delete a file
diff [file1] [file2]
Compare two files
source [file]
Compile from source code
[command] | tee [filename] >/
dev/null
Store command output to a
file, skip terminal output
host [domain]
Run a process in background
File Permission
Shell Command Management
Network Management
Words/lines/bytes in directory
Users and Groups
Keyboard Shortcuts
Ctrl + C
Kill current process
Ctrl + Z
Stop process (can be resumed)
Ctrl + W
Cut the word before the cursor
Ctrl + U
Cut part of the line before the
cursor
Ctrl + K
Cut part of the line after the
cursor
Ctrl + Y
Paste from clipboard
Ctrl + R
Recall last command
IP lookup for a domain
hostname -l
Show local IP address
wget [file_url]
Download a file from url
id
Show active user details
last
Show last system logins
who
Show who is logged in
w
Show logged users and activity
groupadd [group]
Add a new group
Full permission to owner,
read and write for others
adduser [user]
Add a new user
cd ..
Move up one level
Ctrl + O
Run the recalled command
chown [user] [file]
Change file ownership
usermod -aG [group] [user]
Add user to group
cd
Change directory to $HOME
Ctrl + G
Exit command history
chown [user]:[group] [file]
Change file owner and group
userdel [user]
Delete a user
cd [/location]
Change to specified directory
!!
Repeat the last command
usermod
Modify user information
exit
Log out of the session
chgrp [group] [directory]
Change directory group
chmod 777 [file]
SSH Login
chmod 755 [file]
telnet [host]
Rename a file
Add a new kernel module
Install a package with YUM
ssh -p [port] [user]@[host]
mv [filename1] [filename2]
modprobe [module-name]
yum install [package.rpm]
Connect to host as user
Connect to host via port 22
Variables
Show last 10 lines of a file
Most recent suspended job to
foreground
ssh [host]
Show current day and month
tail [file]
fg
ssh [user]@[host]
cal
Show processes as a tree
Package info & summary
Install software from source
code
Copy directory1 to directory2
pstree
yum info [package]
tar zxvf [source_code.tar.gz]
cd [source_code]
./configure
make
make install
cp -r [directory1] [directory2]
List variables and functions
List background processes
apt install [package]
Manage the system clock
set
bg
rpm -e [package.rpm]
timedatectl
Shut down immediately
Find a package by a keyword
rpm -i [package.rpm]
Copy file1 to file2
shutdown now
yum search [keyword]
dnf install [package.rpm]
cp [file1] [file2]
Show first 10 lines of a file
Create a gz compressed file
Package Installation
Show current time and date
head [file]
Create a gzip tar file
gzip [file]
date
Show active process snapshot
Extract archived file
tar czf [file.tar.gz]
Force remove directory
ps
Create a tar file from a file
tar xf [file.tar]
rm -rf [directory]
chmod 766 [file]
File read, write, execute
permissions to everyone
Full permission to owner,
read permissions for others
Use a non-default port
Connect to Telnet via port 23
curl -O [file_url]
Download a file from url
nslookup [domain]
Show domain information
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