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Full Discussion: Help with foreach loop and extracting a certain string.
Top Forums Shell Programming and Scripting Help with foreach loop and extracting a certain string. Post 302213599 by KevinADC on Thursday 10th of July 2008 02:22:56 PM
Old 07-10-2008
If they wanted to check the entire IP address for an exact match they would use "eq" instead of a regexp:

Code:
@ips = qw(10.216.74.137 10.216.74.144 10.216.74.148);
$agent_address = "10.216.74.144";
foreach(@ips) {
   print "$_\n" if ($_ eq $agent_address);
}

Your way will find false positives especially because the dot character in the IP addresses will be interpreted as a wild card character in the regexp instead of a dot. You would want to use the \Q option to avoid that interpretation of the dot in an m// regexp.

Personally I do not understand this requirement:

Code:
I want to have a list of IP addresses and exit when an extracted IP address is not in that list.

"Exit" what? The only way to make sure the IP address is not in the list is to check the entire list, unless the list is in some type of order and you know once you get passed a certain part of the list the IP address can no longer be in the list. Like the letter "c" can not be past the letter "d" in an alpha sorted list of a-z.

Assuming the dot is always present after probableCause in the string:

Code:
$msg_line = 'enterprises.alcatel.nmu.genos.alarmHandoff.alarmHandoffObjects.alarmTable.alarmEntry.probableCause.3 200904 = Replaceable Unit Missing';
my $probablecause;
if ($msg_line =~ m/probableCause\.(?:[\d ]*)=([\S\s]+)$/) {
   $probablecause = $1 || 'no match';
}
print $probablecause;

 

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LEARN ABOUT LINUX

irsend

IRSEND(1)							   User Commands							 IRSEND(1)

NAME

       irsend - basic LIRC program to send infra-red commands

SYNOPSIS

       irsend [options] DIRECTIVE REMOTE CODE [CODE...]

DESCRIPTION

       Asks the lircd daemon to send one or more CIR (Consumer Infra-Red) commands. This is intended for remote control of electronic devices such
       as TV boxes, HiFi sets, etc.

       DIRECTIVE can be:
	  SEND_ONCE	    - send CODE [CODE ...] once
	  SEND_START	    - start repeating CODE
	  SEND_STOP	    - stop repeating CODE
	  LIST		    - list configured remote items
	  SET_TRANSMITTERS  - set transmitters NUM [NUM ...]
	  SIMULATE	    - simulate IR event

       REMOTE is the name of a remote, as described in the lircd configuration file.

       CODE is the name of a remote control key of REMOTE, as it appears in the lircd configuration file.

       NUM is the transmitter number of the hardware device.

       For the LIST DIRECTIVE, REMOTE and/or CODE can be empty:

	  LIST	 ""    ""   - list all configured remote names
	  LIST REMOTE  ""   - list all codes of REMOTE
	  LIST REMOTE CODE  - list only CODE of REMOTE

       The SIMULATE command only works if it has been explicitly enabled in lircd.

       -h --help
	      display usage summary

       -v --version
	      display version

       -d --device
	      use given lircd socket [/var/run/lirc/lircd]

       -a --address=host[:port]
	      connect to lircd at this address

       -# --count=n
	      send command n times

EXAMPLES

	  irsend LIST DenonTuner ""
	  irsend SEND_ONCE  DenonTuner PROG-SCAN
	  irsend SEND_ONCE  OnkyoAmpli VOL-UP VOL-UP VOL-UP VOL-UP
	  irsend SEND_START OnkyoAmpli VOL-DOWN ; sleep 3
	  irsend SEND_STOP  OnkyoAmpli VOL-DOWN
	  irsend SET_TRANSMITTERS 1
	  irsend SET_TRANSMITTERS 1 3 4
	  irsend SIMULATE "0000000000000476 00 OK TECHNISAT_ST3004S"

FILES

       /etc/lirc/lircd.conf
	      Default lircd configuration file.  It should contain all the remotes, their infra-red codes and the corresponding timing	and  wave-
	      form details.

DIAGNOSTICS

       If lircd is not running (or /var/run/lirc/lircd lacks write permissions) irsend aborts with the following diagnostics:
       "irsend: could not connect to socket"
       "irsend: Connection refused" (or "Permission denied").

SEE ALSO

       The documentation for lirc is maintained as html pages. They are located under html/ in the documentation directory.

       lircd(8), mode2(1), smode2(1), xmode2(1), irrecord(1), irw(1), http://www.lirc.org.

irsend 0.9.0-pre1						   October 2010 							 IRSEND(1)
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