• Linux is not popular operating system, but who use Linux some of basic command for them, I think it will be helpful form them who use Linux:
  • For changing directory / to /etc
  • [root@pc1 /]# cd /etc
  • One step back /etc to /
  • [root@pc1 etc]# cd ..
  • Go to previous working directory
  • [root@pc1 /]# cd –
  • Go to current login user home directory
  • [root@pc1 etc]# cd ~
  • Show the contents of /etc in single color
  • [root@pc1 ~]# dir /etc
  • Show the contents of /etc in different colors with nature of contents
  • [root@pc1 ~]# Ls /etc
  • create a folder on root partition
  • [root@pc1 ~]# mkdir /disk
  • Create a folder in /disk
  • [root@pc1 ~]# mkdir /disk/dir
  • Create multiple folder in multiple directories with single command
  • [root@pc1 ~]# mkdir /etc/dir1 /var/dir2 /usr/dir3
  • Create multiple folder in same directory
  • [root@pc1 ~]# mkdir dir1 dir2 dir3
  • Copy a file in directory
  • [root@pc1 disk]# cp file dir
  • Copy a file from /disk/file and paste it in /disk/dir/
  • [root@pc1 disk]# cp /disk/file /disk/dir
  • Copy a directory with –r option
  • [root@pc1 disk]# cp -r dir dir2
  • Copy a file from /disk/file and paste it in /etc with myfile name
  • [root@pc1 disk]# cp /disk/file /etc/myfile
  • Remove a file
  • [root@pc1 disk]# rm file
  • Remove a file with forcefully option
  • [root@pc1 disk]# rm –f file
  • Remove a directory with out –r option and you face will an error
  • [root@pc1 disk]# rm dir
  • Remove a directory with –r option
  • [root@pc1 disk]# rm -r /disk
  • Remove a directory with forcefully option
  • [root@pc1 disk]# rm -rf dir
  • Move /etc/dir1 to /disk/ with different name
  • [root@pc1 disk]# mv /etc/dir1 /disk/mydir
  • Rename the folder name mydir to dir
  • [root@pc1 disk]# mv /disk/mydir /disk/dir
  • Rename the file name with myfile
  • [root@pc1 disk]# mv file myfile
  • Read a file page by page with less command
  • [root@pc1 disk]# less /etc/grub.conf
  • Read a file page by page with more command
  • [root@pc1 disk]# more /etc/qrub.conf
  • Read first ten lines of grub.conf
  • [root@pc1 disk]# head /etc/grub.conf
  • Read last ten lings of grub.conf
  • [root@pc1 disk]# tail /etc/grub.conf
  • Read first 12 lines with –n option
  • [root@pc1 disk]# head -n 12 /etc/grub.conf
  • Read last 11 lines with –n option
  • [root@pc1 disk]# tail -n 11 /etc/grub.conf
  • Copy the contents of /etc/grub.conf in /disk/file
  • [root@pc1 disk]# cat /etc/grub.conf > /disk/file
  • Append the contents /etc/mtab in /etc/file
  • [root@pc1 disk]# cat /etc/mtab >> /disk/file
  • Merging tow commands with pipe sign output of the first command is input of second command
  • [root@pc1 disk]# cat /etc/squid/squid.conf I more
  • Count the total lines of squid.conf
  • [root@pc1 disk]# cat /etc/squid/squid.conf I wc -L
  • Show only spool words in squid.conf
  • [root@pc1 disk]# cat /etc/squid/squid.conf I grep spool
  • Flush the contents of file
  • [root@pc1 disk]# cat /dev/null > /var/log/messages

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