Create a script called script8.1 that will do the following: Accept a username a

Question

• Create a script called script8.1 that will do the following:
  • Accept a username as an argument; if one is not provided, ask for it; (Assume that the argument or user input provided is an actual username.)
  • Using the argument (if it's provided) or user input (if it's not), check to see if that user is logged on;
  • Display to the screen an appropriate message: either " is logged on" or " is not logged on"
  • Do not display anything to the screen except the request for a user name, if
    necessary, and the statement that the user is (or is not) logged on.

Explanation / Answer

#! /bin/bash

if [ $# -ne 1 ]
then
echo "Usage: test username"
exit 1
else
LOGIN_CHK=`who | cut -f1 -d" " | grep -i $1 |wc -l`
if [ "$LOGIN_CHK" -gt "0" ]
then
echo "$1 is logged on"
else
echo "$1 is NOT logged on"
fi
fi

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