user-tools/repeat

   1 #!/bin/bash
   2
   3 true <<EOF
   4 =pod
   5
   6 =head1 NAME
   7
   8 repeat - Run a give command repeatedly
   9
  10 =head1 SYNOPSIS
  11
  12 repeat I<COMMAND> [I<ARGS>]
  13
  14 =head1 ENVIRONMENT
  15
  16 =over 4
  17
  18 =item REPEAT_TIMES
  19
  20 How many times to repeat the given command.
  21 Default is -1 which means infinite.
  22
  23 =item REPEAT_COUNT
  24
  25 How many times the command has been ran.
  26 It is not a variable repeat(1) itself takes as input,
  27 but passes to I<COMMAND> for its information.
  28
  29 =item REPEAT_UNTIL
  30
  31 Stop repeat(1) if I<COMMAND> exists with this return code.
  32 By default the return code is not checked.
  33
  34 =item REPEAT_DELAY
  35
  36 Sleep interval between invocations.
  37 In seconds, by default.
  38 See sleep(1) for valid parameters, eg. "10m" for 10 minutes.
  39 Default is no delay.
  40
  41 =back
  42
  43 =cut
  44
  45 EOF
  46
  47
  48 . /usr/lib/tool/bash-utils
  49
  50 if [ "$1" = --help -o $# = 0 ]
  51 then
  52         echo "Usage: [REPEAT_TIMES=num] [REPEAT_DELAY=interval] [REPEAT_UNTIL=code] repeat <COMMAND> [<ARGS>]"
  53         exit 0
  54 fi
  55
  56 REPEAT_TIMES=${REPEAT_TIMES:--1}
  57 export REPEAT_COUNT
  58 REPEAT_COUNT=0
  59
  60 while [ $REPEAT_TIMES = -1 -o $REPEAT_COUNT -lt $REPEAT_TIMES ]
  61 do
  62         "$@"
  63         if [ $? = "$REPEAT_UNTIL" ]
  64         then
  65                 break
  66         fi
  67         REPEAT_COUNT=$[REPEAT_COUNT + 1]
  68         sleep ${REPEAT_DELAY:-0}
  69 done