user-tools/fgat

   1 #!/bin/bash
   2
   3 set -e
   4
   5 now=`date +%s`
   6 terminus=`date +%s -d "$1"`
   7 shift
   8 declare -a command
   9 command=("$@")
  10
  11
  12 if [ -z "$1" ]
  13 then
  14         echo "No command specified." >&2
  15         exit 252
  16 fi
  17 if [ $terminus -lt $now ]
  18 then
  19         echo "Time past." >&2
  20         exit 253
  21 fi
  22
  23 at=`date -d @$terminus`
  24 echo "Command scheduled to run at $at." >&2
  25
  26
  27 while [ $terminus -gt $now ]
  28 do
  29         set +e
  30         sleep $[$terminus - $now]
  31         set -e
  32         now=`date +%s`
  33 done
  34
  35 exec "${command[@]}"
  36 exit $?
  37
  38
  39
  40 true <<EOF
  41
  42 =pod
  43
  44 =head1 NAME
  45
  46 fgat - Execute command in foreground at a given time
  47
  48 =head1 SYNOPSIS
  49
  50 fgat <B<time-spec>> <B<command>> [B<arguments>]
  51
  52 =head1 DESCRIPTION
  53
  54 In opposite of at(1), fgat(1) stays in console's foreground and waits for B<time-spec>, after that runs B<command>.
  55 B<time-spec> can be any string accepted by date(1).
  56
  57 =cut
  58
  59 EOF