Restrict a user to running a command only two times [closed]

I want to restrict a user to run a command only two times in Ubuntu.

Specifically, I have created a custom command through an alias which needs to be executed only two times by every user.

My custom command is

alias extend_shutdown_150='bash extend_shutdown.sh 150'

I'm not getting the way to implement more on this!

#!/bin/bash
minutes=$1
echo $minutes >> /usr/bin/input.log

a=`grep -i 15 /usr/bin/input.log | wc -l`
b=`grep -i 30 /usr/bin/input.log | wc -l`
c=`grep -i 60 /usr/bin/input.log | wc -l`
#echo $a $b $c
if [[ "$a" -gt "2" ]] ||  [[ "$b" -gt "2" ]] ||   [[ "$c" -gt "2" ]] ; then
     echo " Error: User tried to snooze the system more then 2 times"
elif [[ "$minutes" -eq "15" ]] ||  [[ "$minutes" -eq "30" ]] ||   [[ "$minutes" -eq "60" ]] ; then
     echo " System shutdown is extend $minutes Minutes more"
else
  echo " Error: Minutes must be one of 15,30 or 60"
fi

So based on user input the data will be stored into /usr/bin/input.log so I'm comparing the same file to stop the user from snoozing the system.

Is there any possible way I can append the username & date in /usr/bin/input.log e.g.: hari 9/2/2021 15?

Solution 1:

You may implement that yourself in your bash script.

• Have the script log the date and user in a log file each time the command is started.
• Have the script read the log and check whether the date/user combination occurs less than twice (e.g. a grep -c $PATTERN $FILE could do: this counts the number of lines in which a certain pattern, e.g. "date + username", occurs)
• Continue execution or halt with a message if the number of lines > 2.