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Full Discussion: Using getopts. Need help
Top Forums Shell Programming and Scripting Using getopts. Need help Post 302512533 by losingit on Sunday 10th of April 2011 07:50:25 PM
Old 04-10-2011
Using getopts. Need help

Hi all...

I have been looking on here for the past few days for an answer and Im gonna have to break down and ask.

I just learned about the getopts command last week so have been trying to utilize it in my scripts.

Below, I am trying to set up a case structure for options using getopts. The options I wanna use are -m, -t and -f. Ive gotten the -m and -t to work but if you look at my code the -f is not working when I test it. It seems like when I enter something on the command line like " mon -f dog"
where mon is my program name and dog is the file I wanna test for existence, the -f is actually passed as the argument. Any ideas?

Code:
mailopt=FALSE
interval=5
while getopts mft: option
do
case "$option"
in
m) mailopt=TRUE;;
t) interval=$OPTARG;;
f) if [ -f "$1" ]
then
echo "ok $1"
else
echo "no $1"
fi
exit 1;;
\?) echo "Usage: mon [-m] [-t n] [-f] user"
    echo "      -m means to be informed by mail"
    echo "      -t means check every n secs"
    echo "  -f means check for existence fo a file"
    exit 1;;
esac
done
if [ "$OPTIND" -gt "$#" ]
then
echo "Missing user name!"
exit 2
fi
shiftcount=$((OPTIND - 1))
shift $shiftcount
user=$1
until who | grep "^$user " > /dev/null
do
sleep $interval
done
term=$(who | grep $user | cut -d' ' -f3)
if [ "$mailopt" = FALSE ]
then
echo "$user has logged on $user has logged on to terminal $term"
else
runner=$(who am i | cut -c1-7)
echo "$user has logged on to terminal $term" | mail $runner
fi

---------- Post updated at 07:50 PM ---------- Previous update was at 07:40 PM ----------

Just realized if I switch the $1 in my if statement in the case to a $2 it actually works. So the if is reading my -f as an argument, not a variable. How can I fix it?
 

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echo(1B)					     SunOS/BSD Compatibility Package Commands						  echo(1B)

NAME
echo - echo arguments to standard output SYNOPSIS
/usr/ucb/echo [-n] [argument] DESCRIPTION
echo writes its arguments, separated by BLANKs and terminated by a NEWLINE, to the standard output. echo is useful for producing diagnostics in command files and for sending known data into a pipe, and for displaying the contents of envi- ronment variables. For example, you can use echo to determine how many subdirectories below the root directory (/) is your current directory, as follows: o echo your current-working-directory's full pathname o pipe the output through tr to translate the path's embedded slash-characters into space-characters o pipe that output through wc -w for a count of the names in your path. example% /usr/bin/echo "echo $PWD | tr '/' ' ' | wc -w" See tr(1) and wc(1) for their functionality. The shells csh(1), ksh(1), and sh(1), each have an echo built-in command, which, by default, will have precedence, and will be invoked if the user calls echo without a full pathname. /usr/ucb/echo and csh's echo() have an -n option, but do not understand back-slashed escape characters. sh's echo(), ksh's echo(), and /usr/bin/echo, on the other hand, understand the black-slashed escape characters, and ksh's echo() also understands a as the audible bell character; however, these commands do not have an -n option. OPTIONS
-n Do not add the NEWLINE to the output. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWscpu | +-----------------------------+-----------------------------+ SEE ALSO
csh(1), echo(1), ksh(1), sh(1), tr(1), wc(1), attributes(5) NOTES
The -n option is a transition aid for BSD applications, and may not be supported in future releases. SunOS 5.10 3 Aug 1994 echo(1B)
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