Shell Script to Check if the User is Logged in or Not

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.

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Jazib
Android Developer | Competitive Programmer

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