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Shell Programming and Scripting

Error Trapping

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# 1  
Old 05-24-2005
Error Trapping
Hi,

Can anybody tell me how to error trap an empty line. If i am asked for a password and I hit enter without entering any text, how do i display an error?

Thanks
Kev
# 2  
Old 05-24-2005
Try this...


#!/bin/ksh
echo "Enter passwd : \c"
read passwd
if test ! -n "$passwd"
then
echo "Please enter something"
fi
# 3  
Old 05-24-2005
So how would i go about puting it into this:

echo "Which User ID do you want to check?"
read user


grep $user /etc/passwd
if test $? -eq 0
then
echo "$user exists"
else
echo "$user is available"
fi

exit 0

Cheers
# 4  
Old 05-24-2005
I couldn't figure out what you need exactly Smilie
# 5  
Old 05-24-2005
sorry,

I meant how to put the error trapping into the script. I need the script to return an error if enter is pressed and no data has been entered.
# 6  
Old 05-24-2005
That's exactly the script I gave does. Try running the script and Just press eneter when it prompts for the passwd. It will display the message!!
# 7  
Old 05-25-2005
MySQL
Try this !

Code:
echo "Which User ID do you want to check?"
read user
if test ! -n "$user"
then
    echo "Please enter something"
    exit 1
fi

grep $user /etc/passwd
if test $? -eq 0
then
    echo "$user exists"
else
    echo "$user is available"
fi
exit 0

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