#! /bin/bash## original from:# repeat: repeat a command.# @(#) repeat.ksh 1.1 93/06/03# 90/05 john h. dubois iii (john@armory.com)# 90/11 added help# 93/06/03 Added s, h, p, and v options## conversion to bash v2 syntax done by Chet Rameyistrue(){	test 0 -ne "$1"}isfalse(){	test 0 -eq "$1"}phelp(){echo "$name: repeatedly execute a command line.$Usagecommandline is executed once for each integer from startcount through endcountinclusive.  The default for startcount is 1 if a positive endcount or noendcount is given, and -1 if a negative endcount is given.  A countparameter consisting of a single number is taken to be an endcount.  Ifonly an endcount is given and it is positive, commandline is executedendcount times.  endcount may be less than startcount.  If no endcount isgiven (e.g. a count parameter of \"10-\"), commandline execution repeatsindefinitely with the iteration variable incrementing in a positivedirection.  A count parameter of consisting of \"-\" will repeatindefinitely starting with 1.Note that quoting and variables in commandline are interpreted twice, oncewhen it is passed to the repeat command, and once when it is actually executed.The iteration variable is \"count\".  If \$count is used in commandline, makesure it is quoted with ' or \.Options:-h: Print this help.-p: Print value of iteration variable on stderr before each iteration.-s <sec>: sleep for <sec> seconds after each iteration except the last.-v: Print start and end values before beginning."}name=${0##*/}Usage="Usage: repeat [-hpv] [-s <sec>] [[startcount]-][endcount] command [arg ...]"typeset -i count=1 forever=0 sleep=0 print=0 verbose=0while getopts :0123456789hpvs: opt; do    case $opt in    h) phelp; exit 0;;    s) sleep=$OPTARG || exit 1;;    p) print=1;;    v)verbose=1;;    [0-9]) break;;    +?) echo "$name: options should not be preceded by a '+'." 1>&2; exit 2;;    ?)  echo "$name: $OPTARG: bad option.  Use -h for help." 1>&2; exit 2;;    esacdone # remove args that were optionsshift $((OPTIND-1))if [ $# -lt 2 ]; then    echo -e "$Usage\nUse -h for help." 1>&2    exit 2ficase "$1" in-[0-9]*-|[0-9]*-)    # Start value only    count=${1%-}    forever=1    end="-1";    ;;-[0-9]*-[0-9]*|[0-9]*-[0-9]*)    # Start and end value    s=${1%-}    end=${s##[0-9]*-}    count=${s%-$end}    ;;-[0-9]*|[0-9]*)    end=$1    case "$end" in    -\*)	count=-1;;    esac    ;;-)    forever=1    end="-1";    ;;*)     echo "$name: bad count parameter: $1" 1>&2    exit 1    ;;esacshift[ -z "$end" -o $count -le "$end" ] && increment=1 || increment=-1istrue $verbose && echo "start=$count end=$end" 1>&2# Need to do this here so that up to this point, -0 will keep the leading -# and end will not be 0 if no value assignedtypeset -i endlet end+=increment	# make loop inclusive of original endcountwhile istrue $forever || [ $count -ne $end ]; do    istrue $print && echo $count 1>&2    eval "$@"    istrue $sleep && sleep $sleep    let count+=incrementdone