bash_retry.sh

#!/bin/bash
# Source this in your script to use these functions

function bash_check_int {
    if [ "$1" -eq "$1" ] 2>/dev/null; then
        return 0
    fi
    echo "$2 must be an integer"
    return -1
}

function bash_retry_loop {
    if [ $# -lt 3 ]; then
        echo "Wrong arguments. bash_retry_loop <loop_count> <loop_delay> <command>"
        return -1
    fi
    max=$1
    delay=$2
    bash_check_int $max   "First arg (loop_count)"
    if [ $? -ne 0 ]; then return -1; fi
    bash_check_int $delay "Second arg (loop_delay)"
    if [ $? -ne 0 ]; then return -1; fi

    inp_command="${@:3}"
    local n=1
    while true; do
        $inp_command && break || {
            if [[ $n -lt $max ]]; then
                ((n++))
                echo "Command failed. Attempt $n/$max:"
                sleep $delay;
            else
                echo "The command has failed after $n attempts." >&2
                return -1
            fi
        }
    done
}