To delete user in linux first login as root using using su – then provide root password after login use command userdel -r user_name. userdel command is used to delete ther specified user_name
1 2 3 4 | [cse@localhost ~]$ su - Password: [root@localhost ~]# userdel -r manish [root@localhost ~]# |
With userdel -r We delete a user and its home directory and the user´s mail spool.
For adding a new user first login as root using su – then use command useradd username this will create n new user to check detail of user use id username it will show user detail. login as root
1 2 | [abc@localhost ~]$su - password: |
give the following command
1 | [root@localhost ~]#useradd manish |
check user is created or not
1 2 | [root@localhost ~]#id manish uid=501(manish) gid=501(manish) groups=501(manish) |
it will give … Read more
Command “cal” stands for calendar.This command is used to see the calendar of a specific month/ year or both.The basic syntax of command “cal”.
1 | cal [month] [year] |
[month]- is used for specify month[year] – is used for specify year cal command to display calendar of current month type “cal” command on terminal and press enter and output … Read more
“mv” command is used to moves a group of file to a another/different directory. “mv” command can also use to rename file and directory. This command does not create a new copy of file , it only rename it. When we rename it does not consume any additional space on the disk. Syntax:
1 | $ mv file01 RenameFile [press enter] |
Example … Read more
Linux and Unix tail command is one of the important command. Command tail displays the bottom/end of the file at the terminal. When “tail” command is used without any option it will display the bottom/end ten lines of the file. Syntax of tail Command in Unix and Linux Syntax:
1 | $ tail filename [press enter] |
Example of tail Command in … Read more
Command sort is used to display/arrange the content of the text file in ascending or descending order. By default, sort command sorts the entire lines. Syntax:
1 | $ sort filename [press enter] |
Example: Suppose we have a file Employee.txt as shown below and we want to sort the content of the file and display at the terminal. By default sort … Read more
Command head displays the beginning/top of the file at the terminal. When “head” command is used without any option it will display the beginning/top ten lines of the file. Syntax:
1 | $ head filename [press enter] |
Example: Suppose we have a file Employee.txt as shown below and we want to see the beginning/top of this file by default it will … Read more
Command tee displays the output of the command and at the same time it saves this output in a file specified by the user. “tee” command can be used anywhere along with pipeline. Example: Suppose we have a file Data.txt as shown below and we want to see the content of this file and at … Read more
“rm” command is used to remove/delete files. this command can delete more than one file at a time. “rm” command can also delete the specific file from the directory. Syntax:
1 | $ rm filename [press enter] |
Example: Suppose we want to delete a file Mybook01 then the command is as follows:
1 | $ rm Mybook01 [press enter] |
Note: File ones delete can’t be regained. Delete … Read more
cat command is used to see the content of the file. cat command is also used to concatenate two or more file. cat command is also used to create new files. Syntax:
1 | $ cat filename [press enter] |
Suppose we have two files Employee.txt and Data.txt as shown below:
1 2 3 4 5 | Name | Post | Salary | DOB | Age | Aditya | DGM | 100000 | 03-02-1987 | 30 | Kumar | GM | 700000 | 05-02-1977 | 41 | Manish | CA | 500000 | 10-02-1997 | 20 | Rajeev | CLERK| 300000 | 05-05-1987 | 31 | |
File 1: Employee.txt File 2: Data.txt Example: To see the … Read more
