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.
The first line contains one string: username
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
$ 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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