How can i convert the following bash script into a perl script -

  #!/bin/bash  i="0"  echo "" echo "##################" echo "launching requests" echo "  count:  $2 " echo "  delay:  $3 " echo "  sessid: $1" echo "##################" echo ""  while [ $2 -gt "$i" ]   i=$[$i+1]   php avtest.php $1 $4 &   echo "executing request $i"   sleep $3 done  

here better/modified script in bash

  #!/bin/bash  i="0" #starttime=`date +%s` starttime=$(date -u +%s) starttime=$[$starttime+$1+5] #starttime=$($starttime+$1+5) dtime=`date -d @$starttime` echo "" echo "##################" echo "launching requests" echo "  count:  $1 " echo "  delay:  1 " #echo "  execution:  $starttime " echo "  scripts fire @ :  $dtime " echo "##################" echo ""  while [ $1 -gt "$i" ]   i=$[$i+1]   php avtesttimed.php $1 $3 $starttime &   echo "queueing request $i"   sleep 1 done  

here's direct translation

#!/usr/bin/env perl use strict; use warnings;  print <<here; ################## launching requests   count:  $argv[1]   delay:  $argv[2]   sessid: $argv[0] ################## here  $i = 0; while($argv[1] > $i){     $i += 1;     system("php avtest.php $argv[0] $argv[3] &");     print "executing request $i\n";     sleep $argv[2]; } 

but make more sense read command line parameters variables named after they're , not rely on remembering argument ordering.

a brief errata in conversion:

i use here string represent multiline text. have put in multiple print statements more closely mimic bash version

in bash arguments accessed numbered variables, starting $1 , going up. in perl argument list represented array @argv, numbered starting @ 0 (like arrays in languages). in both bash , perl name of script can found in variable $0.

in perl arrays written @arrayname when refering entire array, use $arrayname[index] when accessing array members. perl $list[0] bash ${list[0]} , perl @list bash ${list[@]}.

in perl variables declared my keyword; equivalent in bash declare.

i've used system function spawning background processes. argument can command line might use in bash.

unlike echo, print requires told if there should newline @ end of line. recent versions of perl say function exists append newline you.

the perl sleep function pretty self-explanatory.

edit: due typo $i in print statement had been represented $ni leading runtime errors. has been corrected.