|
whatis
Search whatis database for complete words; used to find short descriptions of system commands
|
|
which
Shows the full path to shell commands
|
|
whereis
Locate binary, source and man pages for a command
|
|
apropos
Search through a database of short description to find help and man pages containing certain terms and commands
|
|
man
Manual pages for commands
|
|
env
|
List current environment variables
|
|
echo $NAME
|
Output value of $NAME variable
|
|
export NAME=value
|
set $NAME to value in enviroment
|
|
set
|
Change value of shell atrributes and positional parameters or display list of shell variables and functions
|
|
$PATH
|
Exectuable search path
|
|
$HOME
|
Home directory
|
|
$SHELL
|
Current shell
|
|
df
Report file system disk space usage
|
|
mount
Show whats mounted or mount a file system
|
|
unmount
Unmount a file system
|
|
fuser
Identifies processes using files or sockets
|
|
isof
list open files on the system
|
|
clear
|
clears your screen
|
|
pwd
|
Shows current directory
|
|
cd
|
Change directories
|
|
ls
|
List directory contents
|
|
mkdir
|
Create a new directory
|
|
rmdir
|
Delete an empty directory
|
|
cat
|
Print a file on the screen, concatenate files
|
|
touch
|
Create an empty file, change file timestamps
|
|
cp
|
Copy directories or files
|
|
mv
|
Moves directories or files
|
|
rm
|
Removes directories or files (This is how you remove recursively)
|
|
ln
|
Creates a symbolic or hard link for a file
|
|
less
|
View a file on page at a time, allows for going backwards
|
|
head
|
Print the first 10 lines of a file
|
|
tail
|
Print the last 10 lines of a file
|
|
wc
|
Count the number of words or characters in a file
|
|
stat
|
Display file of file system status
|
|
cut
|
Remove sections from lines of input
|
|
paste
|
Merge lines of files
|
|
grep
|
Search text files for lines containing a matching pattern
|
|
locate
|
Find files by matching the whole path name
|
|
find
|
search for files in a directory hierarchy
|
|
uname
|
Prints information about a machine and operating system it is run on
|
|
who
|
Print who is currently logged in
|
|
uptime
|
Prints system uptime and load
|
|
sudo
|
Execute a command as another user, usually with higher permissions
|
|
shutdown
|
Bring the system down in a safe way
|
|
-a
|
Show all (including hidden)
|
|
-R
|
Recursive list
|
|
-r
|
Reverse order
|
|
-t
|
Sort by last modified
|
|
-S
|
Sort by file size
|
|
-l
|
Long listing format
|
|
-1
|
One file per line
|
|
-m
|
Comma-separated output
|
|
-Q
|
Quoted output
|
|
-i
|
Case insensitive search
|
|
-r
|
Recursive search
|
|
-v
|
Inverted search
|
|
-o
|
Show matched part of file only
|
|
ps
|
Report on current processes
|
|
pstree
|
Display a tree of processes
|
|
top
|
Show real time processes
|
|
kill
|
Terminate a process by PID
|
|
killall
|
Kill a process by name
|
|
pkill
|
Look up or signal processes based on same and other attributes
|
|
pgrep
|
Grep for process information
|
|
ctrl+z
|
Stop the job but don't end process
|
|
&
|
Place this after a command to put the process in the background
|
|
jobs
|
Display all jobs
|
|
chmod 775 file
Change file permissions to 775
|
|
chmod -R 600 folder
Recursively chmod folder to 600
|
|
chown user.group file
Change file owner to user and group to group
|
|
First number is the owner permission, second is group and third is everyone
|
|||
|
Calculate permission digits by adding number below:
|
|||
|
suid=4
|
421
|
421
|
421
|
|
sgid=2
|
rwx
|
rwx
|
rwx
|
|
flag=1
|
owner
|
group
|
world
|
example: cmod 777 /etc/file.txt |
|||
|
/etc/sysconfig/network-scripts
This folder contains the configuration files for each interface on the system; usually named ifcfg-eth0 or ifcfg-eth1.
|
|
/etc/resolv.conf
This file contains the permanent Domain Name Server (DNS) settings
|
|
ifconfig
|
Configure network interface
|
|
route
|
Show/Manipulate the IP routing table
|
|
ip
|
Show/Manipulate routing, devices, policy and tunnels; replaces ifconfig, arp, and route
|
|
ifup
|
Bring network interface up
|
|
ifdown
|
Bring network interface down
|
|
ping
|
Send ICMP ECHO_REQUEST to network hosts
|
|
groupadd
Create a new group
|
|
groupdel
Delete a group
|
|
groupmod
Modify definition of a specified group
|
|
useradd
Create a new user
|
|
userdel
Delete a user
|
|
usermod
Modify a user account
|
|
passwd
Update a user's password
|
|
vipw
Edit password, group, shadow-password (Updates etc/shadow)
|
|
vigr
Edit password, group, shadow-group (Updates etc/gshadow)
|
|
chage
Change password policy
|
No comments yet.
Cheatography n. The art of mapping complex subjects into clear, instantly navigable reference guides.
