A shell script is a computer program designed to be run by the Unix shell, a command-line interpreter. The various dialects of shell scripts are considered to be scripting languages. Typical operations performed by shell scripts include file manipulation, program execution, and printing text. A script that sets up the environment, runs the program, and does any necessary cleanup, logging, etc. is called a wrapper.
In this post, we will write a shell script to check if the user provided by the input is logged in or not.
INPUT:
The first line contains one string: username
OUTPUT:
Print “logged in” the user is logged in else print “not logged in”
The following is the shell script to check if the user is logged in or not:
echo enter username read name who > test if grep $name test then echo logged in else echo not logged in fi
OUTPUT:
$ enter username $ test $ test tty1 2019-02-21 10:56 (:0) $ test pts/0 2019-02-21 10:57 (:0) $ test pts/1 2019-02-26 19:19 (:0) $ logged in
Let us know in the comments if you are having any questions regarding this shell script.
And if you found this post helpful, then please help us by sharing this post with your friends. Thank You
