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POError handling in bash/expect script
 

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    <p>Pasted below is a bash script, combined with expect code, which:</p> <ul> <li>connects to remote host via ssh, collects files and prepare tgz file;</li> <li>copy tgz file from remote host to local machine;</li> <li>connects to remote host via ssh again and remove previously created tgz file;</li> <li>finally, extract tgz file on local machine.</li> </ul> <p>Everything works, if passed arguments are valid (i.e., <code>$host</code>, <code>$user</code>, and <code>$pass</code>). If one of them is incorrect, script hangs. I wonder how to include some error handling (e.g., in $cmd1) to terminate script with message if username (or password) is incorrect?</p> <p>Thanks in advance for any pointers.</p> <pre><code>#!/bin/bash prog=$(basename $0) NO_ARGS=0 E_OPTERROR=85 # Script invoked with no command-line args? if [ $# -eq "$NO_ARGS" ]; then echo "Usage: $prog [-h host] [-u username] [-p password]" echo " $prog -help for help." exit $E_OPTERROR fi showhelp() { echo "Usage: $prog [-h host] [-u username] [-p password]" echo " -h: host" echo " -u: username" echo " -p: password" echo " -help: this help message" exit 2 } user="" host="" pass="" now=$(date +"%m-%d-%Y") dir="data_$now" file="data.tgz" while getopts "h:u:p:help" name; do case $name in h) host=$OPTARG ;; u) user=$OPTARG ;; p) pass=$OPTARG ;; help) showhelp $0 ;; esac done if [ -d "$dir" ]; then rm -R $dir mkdir $dir else mkdir $dir fi cmd1=$(expect &lt;&lt; EOF spawn ssh $user@$host expect "password: " send "$pass\n" expect "$ " send "cd /tmp\n" expect "$ " send "tar -czf $file \`find . -maxdepth 1 -name 'f2p_*' -print\`\n" expect "$ " send "logout" EOF) cmd2=$(expect &lt;&lt; EOF spawn scp $user@$host:/tmp/$file $dir expect "password: " send "$pass\n" expect "$ " EOF) CMD3=$(expect &lt;&lt; EOF spawn ssh $user@$host expect "password: " send "$pass\n" expect "$ " send "cd /tmp\n" expect "$ " send "rm $file\n" expect "$ " send "logout" EOF) echo "$cmd1" echo "$cmd2" echo "$cmd3" cd $dir tar -xzf $file rm $file count=$(ls -1 | wc -l | awk '{gsub(/^ +| +$/, "")}1') cd .. #clear echo "All done. Extracted $count *.net files." </code></pre>
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    1. COexcept? expect?
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    2. CO@Ignacio spelling corrected. Thanks for comment.
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