Useful and basic linux commands
Many people find Linux difficult but this is wrong. Linux is a very simple Operating system . In this post, we will learn some simple commands of Linux.
Which will help system administrators and students.
Useful linux commands
- rootuser# ls ———- list content in current directory
- rootuser# ls -l ———- list content in long listing format
- rootuser# ls -al ———- list all subcontent in long listing format
- rootuser# ls -R ———- list content recursively
- rootuser# ls -F ———- list content and classify them
- rootuser# l. ———- list hidden files
- rootuser# ll ———- an alias for the above
- rootuser # find ——————- Memory usage in byte
- rootuser # find -m ——————- Memory usage in Megabyte
- rootuser # find -g ————— Memory usage in gigabyte including free and used
- rootuser# cd ———- change directory to…
- rootuser# cd .. ———- change to parent directory
- rootuser# cd – ———- change to previous directory
- rootuser# cd ———- change to home directory
- rootuser# cd ~ ———- change to home directory
- rootuser# ^l ———- clear the screen
- rootuser# fdsik -l ———- list partition
- rootuser# ssh ———— default command for connecting to a remote Linux computer over the network.
- rootuser# df -h ———- same as my computer in windows
- rootuser# man ———- manual
- rootuser# clear ———- clear the screen
- rootuser# alias ———- display all aliases for current user
- rootuser# alias ———- make alias eg alias c=’clear’
- rootuser# unalias ———- remove alias eg unalias c
- rootuser# cp ———- copy (for files)
- rootuser# cp -a ———- copy (for directories)
- rootuser# cp -p ———- copy and preserve date and time
- rootuser# exit ———- log out from the system
- rootuser# logout ———- log out from the system
- rootuser# ^d ———- log out from the system
- rootuser# mv ———- move OR rename
- rootuser# rmdir ———- remove empty directory
- rootuser# rm ———- remove (for files)
- rootuser# rm -f ———- remove forcefully ( ” ” )
- rootuser# rm -r ———- remove recursively (for directories)
- rootuser# rm -rf ———- remove recursively and forcefully ( ” ” )
- rootuser# clear ———- clear the screen
- rootuser# ^l ———- clear the screen
- rootuser# cat ———- display content of the file
- rootuser# cat -n ———- display content of the file and number the lines
- rootuser# cal ———- display calendar for current month
- rootuser# ln -s ———- make a soft/sym/symbolic link
- rootuser# ln ———- make a hard link
- rootuser# hwclock ———- display the hardware clock
- rootuser# hwclock –hctosys ———- set the system time from the hardware clock (NTP)
- rootuser# date ———- display system date and time
- rootuser# date -s ” ———- change system date and time in mm/dd/yy
- rootuser# who am I ——— display current user, terminal and uptime
- rootuser# w ———- display is details which files are open on which terminal
- rootuser# who —– display users logged in the system with their respective terminals and time since logged in
- rootuser#group —————– which groups a user is a member of
- rootuser# id —————- display id info of current user
- rootuser# id -u ————- display user id of current user
- rootuser# id -un ————————— display username of current user
- rootuser# id -g ————————- display group id of current user
- rootuser# id -gn ——————————- display groupname of current user
- rootuser# history ——————– display the list of the last 1000 commands
- rootuser# ! 289 ———————– Run command 289 in history
- rootuser#tail —————– listing of the last 10 lines of a file.
- rootuser# uptime ————————— display for how long the system has been running
- rootuser# which —————- display the path of the binary
- rootuser# whereis ———————– display all paths
- rootuser# head —————– listing of the first 10 lines of a file
- rootuser# less ————– —————- view files without opening an editor.
- rootuser# vimtutor —————— vi manual with exercise in text based
- rootuser# pico —————— pico manual with exercise in text based
- rootuser# mcedit ———————— mcedit manual with exercise
- rootuser# vi ———— text editor for writing
- rootuser# curl —————– Retrieve information and files Uniform Resource Locators
- rootuser# diff ———- compares two text files and shows difference in prompt
- rootuser# echo ————————- to set or print environment variables
- rootuser# find ————————- finds the file in directory
- rootuser# exit —————— logout from system or terminal
- rootuser#finger ———— short information of the user inclusing login ,full name ,home directory and mails.
- rootuser# root ————- for checking connectivity of the devices connected on the network(LAN) or over the network(WAN).
- rootuser# top ——— showing information of cpu and memory zombi process same as task manager in windows.