#! /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 Ramey istrue() { test 0 -ne "$1" } isfalse() { test 0 -eq "$1" } phelp() { echo "$name: repeatedly execute a command line. $Usage commandline is executed once for each integer from startcount through endcount inclusive. The default for startcount is 1 if a positive endcount or no endcount is given, and -1 if a negative endcount is given. A count parameter consisting of a single number is taken to be an endcount. If only an endcount is given and it is positive, commandline is executed endcount times. endcount may be less than startcount. If no endcount is given (e.g. a count parameter of \"10-\"), commandline execution repeats indefinitely with the iteration variable incrementing in a positive direction. A count parameter of consisting of \"-\" will repeat indefinitely starting with 1. Note that quoting and variables in commandline are interpreted twice, once when it is passed to the repeat command, and once when it is actually executed. The iteration variable is \"count\". If \$count is used in commandline, make sure it is quoted with ' or \. Options: -h: Print this help. -p: Print value of iteration variable on stderr before each iteration. -s : sleep for seconds after each iteration except the last. -v: Print start and end values before beginning." } name=${0##*/} Usage="Usage: repeat [-hpv] [-s ] [[startcount]-][endcount] command [arg ...]" typeset -i count=1 forever=0 sleep=0 print=0 verbose=0 while 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;; esac done # remove args that were options shift $((OPTIND-1)) if [ $# -lt 2 ]; then echo -e "$Usage\nUse -h for help." 1>&2 exit 2 fi case "$1" in -[0-9]*-|[0-9]*-) # Start value only count=${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: $1" 1>&2 exit 1 ;; esac shift [ -z "$end" -o $count -le "$end" ] && increment=1 || increment=-1 istrue $verbose && echo "start=$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 assigned typeset -i end let end+=increment # make loop inclusive of original endcount while istrue $forever || [ $count -ne $end ]; do istrue $print && echo $count 1>&2 eval "$@" istrue $sleep && sleep $sleep let count+=increment done
