#!/bin/bash

[ -z "$2" ] && { echo 'Usage: $0 "file" "some" "command" 
  Runs the command when file exists. waits for max 5 minutes'
    exit
}

fname="$1"
shift 1
otime=1
while :
do  [ -e "$fname" ] || {
        echo -n "File: $fname not found! "
        date
    }
    [ -e "$fname" ] && {
        break
    }
    otime=$(( $otime + 1 ))
    sleep 1
    [ $otime -gt 300 ] && {
       echo "File $fname still missing after 5 minutes!"
       exit 1
    }
done 

eval "$@"