BASH function for automatically rerunning processes if they fail.

RetryIfError.sh

function retryIfError() {
        dry=3         # Default number of tries
        dtl=60        # Default number of seconds to wait
        drc=0         # Default return code

        cmd=$1        # Command to call
        try=${2-$dry} # Number of times to try
        ttl=${3-$dtl} # Number of seconds to wait before trying again
        erc=${4-$drc} # Expected return code on success

        MAILTO=someone@somewhere.com

        for cx in $(seq ${try})
        do
                eval "${cmd}"
                rc=$?

                if [ ${rc} -eq ${erc} ]
                then
                        break
                else
                        if [ ${cx} -ne ${try} ]
                        then
                                mailx -s "RETRYING ${0##*/} - $(date +%Y%m%d)" ${MAILTO} << !
Command: ${cmd}
Return Code: ${rc}, Expected: ${erc}

We have attempted to execute the command ${cx} times.  We will try a total of ${try} times.  Next attempt will be in ${ttl} seconds.

Thanks!
!
                                sleep ${ttl}
                        else
                                mailx -s "RETRYING ${0##*/} - $(date +%Y%m%d)" ${MAILTO} << !
ERROR! Max Retries Exceeded!

Command: ${cmd}
Return Code: ${rc}, Expected: ${erc}

We have attempted to execute the command ${cx} times.  There will be no further attempts.

Thanks!
!
                                exit ${rc}
                        fi
                fi

        done
}