Problem 2: Write a bash script that checks for options passed to it. Your script

Question

Problem 2:
Write a bash script that checks for options passed to it.
Your script should:
(i) Generate error messages
(ii) Check for invalid options
(iii) Check for options d, p, and z, where option ‘d’ must take an argument
(iv) Print to the screen information informing which (if any) option was triggered





For example, again assume that your script is named my_script.sh, a user could invoke it by typing $ my_script.sh -p, $ my_script.sh -z, $ my_script.sh –d argument_to_d, or combination of these options.


Problem 2:
Write a bash script that checks for options passed to it.
Your script should:
(i) Generate error messages
(ii) Check for invalid options
(iii) Check for options d, p, and z, where option ‘d’ must take an argument
(iv) Print to the screen information informing which (if any) option was triggered





For example, again assume that your script is named my_script.sh, a user could invoke it by typing $ my_script.sh -p, $ my_script.sh -z, $ my_script.sh –d argument_to_d, or combination of these options.


Problem 2:
Write a bash script that checks for options passed to it.
Your script should:
(i) Generate error messages
(ii) Check for invalid options
(iii) Check for options d, p, and z, where option ‘d’ must take an argument
(iv) Print to the screen information informing which (if any) option was triggered





For example, again assume that your script is named my_script.sh, a user could invoke it by typing $ my_script.sh -p, $ my_script.sh -z, $ my_script.sh –d argument_to_d, or combination of these options.

Explanation / Answer

#!/bin/bash -l
#PBS -l nodes=4:ppn=8,walltime=24:00:00

cat $PBS_NODEFILE | uniq | tr '\012' ' ' > tmp-$PBS_JOBID
read -a NODE < tmp-$PBS_JOBID
rm tmp-$PBS_JOBID

inode=-1
ijob=0

usage() { echo "Usage: $0 [-s <45|90>] [-p <string>]" 1>&2; exit 1; }

while getopts ":s:p:" o; do
case "${o}" in
s)
s=${OPTARG}
((s == 45 || s == 90)) || usage
;;
p)
p=${OPTARG}
;;
*)
usage
;;
esac
done
shift $((OPTIND-1))

if [ -z "${s}" ] || [ -z "${p}" ]; then
usage
fi

echo "s = ${s}"
echo "p = ${p}"

for ((K=1;K<=8;K++))
do
[ $((ijob++ % 2)) -eq 0 ] && ((inode++))
ssh ${NODE[inode]} _somepath_/RUN$K/sub.script &
done
wait
exit 0

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