I have a program in which the user enters the login credentials and if they fail 3 times in a row, they are locked out of the program (PS. How do I do that? Just "exit"?)
Here's what I have:
Code:
#!/bin/sh
echo "*****Welcome to User Administration Program******"
read -p "Enter Username: " USERVAR
read -s -p "Enter Password: " PASSVAR
for TRY in 1 2 3 4
do
if [ "$TRY" == 4 ] then
exit
else
echo ""
fi
if [ USERVAR == "admin" ] && [ PASSVAR == "superuser" ]
then
echo "Welcome back Admin,"
echo "Enter command>"
read command
else
echo "The username/password you entered was incorrect"
PASSVAR=""
USERVAR=""
fi
done
I'm getting a syntax error on line 9 due to the Else, not sure why.
I think the for loop will work, I'm not sure. I can't really test it properly because of this if statement not working
Probably best to just make the script readable/executable by admin user.
Putting password in the script is not at all secure as user needs to be able to read it to execute an so can just cat/view the script and note down the password.
Thanks sea, that worked.
Question though, with this, instead of it breaking the loop, it plays the message 3 times that the password/username is wrong. Basically it doesn't let the user try again.
I think this is because it isn't changing the values of PASSVAR and USERVAR. How would I reset their values and let the user try again? I have USERVAR = "" and the same for passvar, but I don't think that works. Or rather, it works, and then the program checks for the USERVAR/PASSVAR again, and they are blank. Whilst blank, it still checks them as wrong and shows that it is wrong.
Not sure what to do here
Edit: Even when the user puts in the correct credentials, it still says it is wrong.
Note: the proper syntax for numerical comparison in sh is if [ "$TRY" -eq 4 ].
Also read -p and read -s are bash syntax, but the shebang says #!/bin/sh. So if you want to use that syntax, you need to change the shebang to #!/bin/bash, to ensure the script runs with the proper shell.
In order to repeatedly ask for user name and password, you would need to make the read statements part of your loop, for example:
Code:
TRY=0
while
read -p "Enter Username: " USERVAR
read -s -p "Enter Password: " PASSVAR
echo
do
if [ $(( TRY+=1 )) -eq 4 ]; then
exit
fi
if [ "$condition" = "correct" ]; then # bit of pseudo code to demonstrate how to break from the loop if conditions are met..
break
fi
....
done
--
If you are switching to bash syntax you could also use:
Code:
if (( ++TRY == 4 )); then
--
I agree with Chubler, that putting a password in a script is not a secure way to go about..
This User Gave Thanks to Scrutinizer For This Post:
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