I have written a script to allow me to search for a class code, and student id prefix, which will then display the current students with that prefix, and how many of those that are logged in. Now I want to add an error message when the user fails to enter two arguments (class code and student prefix). In this message I want to display what the error was and the proper syntax. How do I add the error message?
Code:
##### Header ####
echo
echo $1 Students
echo
##### Column Names #####
echo "User ID Name"
##### Search for the student prefix in /etc/passwd, create temp file #####
grep $2 /etc/passwd | cut -d: -f1,5 | sort -t: +1 | sed 's/^\(.*\):\(.*\), \(.*\)$/\1 \3 \2/' > temp
#### Display temp file ####
cat temp
echo
#### Display number of students in $1 class ####
echo Number of $1 students: `cat temp | wc -l`
echo
#### Display list of user names currently ####
#### logged in that match the student prefix ####
echo $1 Students currently logged in
echo
who | grep $2 | cut -c1-7
echo
#### Display how many users currently logged ####
#### in that match the student prefix given ####
echo There are currently `who | grep $2 | wc -l` $1 students logged in.
#### Delete temp file ####
rm temp
Last edited by MadMurdock0311; 03-31-2011 at 05:03 PM..
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03-31-2011
