In this tutorial i will described some of the useful and important Linux command for Linux user. These command are normally we used for operate Linux system, Here we will show each command with example:
Cd command (Use to change directory)
This command is used to change directory.
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# cd ../.. //down two directory |
pwd command :
pwd command return current working directory.
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# pwd |
Service Command:
Service command call script located at /etc/init.d/ directory and execute the script.
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# service httpd start OR # /etc/init.d/httpd start |
Free command:
Free command shows free, total and swap memory information in bytes.
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# free |
Crontab Command:
List schedule jobs for current user with crontab command and -l option.
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# crontab -l //edit cron tab # crontab -e |
Less Command:
This command used to view quickly file. You can page up and down. Use ‘q‘ to quit from less window.
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# less error_log.log |
More Command:
This command used to view file and shows details in percentage. You can page up and down. Press ‘q‘ to quit out from more window.
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# more error_log.log |
VI Command:
This command is used to read/write file on command window.
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# vi test.php |
VI Command(Read Only):
This command is used to read/write file on command window.
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# vi -R test.php |
Go to specic line:
This command is used to read/write file on command window.
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# vi +112 test.php //112 line number |
Go to specic function:
This command is used to read/write file on command window.
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# vi +/test test.php //will go test() fucntion |
Note: Press ‘i’ to write into file and ‘q’ to quite without save and ‘:wq’ with save.
mkdir Command:
mkdir command is used to create directories under Linux.
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# mkdir directoryname |
CP Command:
This command is used to copy file from source to destination preserving same mode.
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# cp -p fileA fileB |
MV Command:
This command is used to rename fileA to fileB. -i options prompt before overwrite.
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# mv -i fileA fileB |
Cat Command:
cat command used to view multiple file at the same time.
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#cat fileA fileB |
rm command:
rm command used to remove or delete a file without prompting for confirmation.
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# rm filename |
Grep Command:
The grep command is used to search a given string in a file. we can use ‘-i’ option for ignoring case sensitive.
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# grep test fileB |
Find Command:
Find command used to search files, strings and directories.
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# find test fileB |
ps Command:
ps command displays about processes running in the system.
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# ps |
kill Command:
Use kill command to terminate process.
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# kill- 9 7508 //this will kill 7508 process id. |
Uptime Command:
This command is used to shows since how long your system is running and the number of users are currently logged in system.
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# uptime |
W Command:
It will displays users currently logged in and their process along-with login name, tty name, remote host, login time, idle time, JCPU, PCPU, command and processes.
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# w |
Users Command:
Users command displays currently logged in users.
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# users |
Whoami Command:
whoami command print the name of current user.
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# whoami |