Backing out of a script if command doesn't return any results?
Hello
I have a script which emails identifies the user ID of a user and sends them an email. A user can enter part of the name of the person he/wants to send the email to. Then I use the ypcat command to identify the UID of that person.
The problem I'm having, is building in an error trap for if the "ypcat passwd | grep -i "$RECIPIENT" | awk -F":" {'print $5 " " $1'}" command doesn't return any names (which may happen if the user makes a spelling mistake, for example).
I was under the impression that if a Unix command is executed and returns a result, then a return value of 0 is generated, hence the reason I put in if [ $! -ne 0 ] after running the ypcat command. However, this is giving me -ne: unary operator expected error message.
Has anybody any idea how I can get the script to back out if no values are returned by the ypcat command?
Many thanks
Glyn
Code:
'3')
TITLE="Synergy Reports - Project ${CM_PROJECT_UC}"
clear
LINENUM=1
print_line 1 "${BOLD_ON}${TITLE}${BOLD_OFF}"
print_line 1 "Enter the name or partial name of the report recipient (Return to Exit) > "
read RECIPIENT
if [ -z $RECIPIENT ]
then
print_line 1 "The User ID for the name you entered could not be identified."
print_line 1
redisplay_report_menu
fi
print_line 1
ypcat passwd | grep -i "$RECIPIENT" | awk -F":" {'print $5 " " $1'}
if [ $! -ne 0 ]
then
print_line 1 "The User ID for $RECIPIENT could not be identified..."
print_line 1
redisplay_report_menu
fi
INC_BY=`ypcat passwd | grep -i "$RECIPIENT" | awk -F":" {'print $1 " " $5'} | wc -l`
LINENUM=`echo "$LINENUM + $INC_BY" -1 | bc`
print_line 1
print_line 1 "Enter the User ID of the recipient (Return to Exit) > "
print_line 1
read USERNAME
if [ -z $USERNAME ]
then
print_line 1 "The User ID for $RECIPIENT could not be identified..."
print_line 1
redisplay_report_menu
fi
email_another_user_menu
;;
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