27472Re: [PBML] Redirect stdout in a larger statement
- Jul 11, 2013Hi Martin,
We can use open2 using which we can read/write through different file
handles. This should work for you.
>perl -MIPC::Open2 -e 'open2(READ, WRITE,"sh"); print WRITE "echo Currenttime is:\n"; print WRITE "date\n"; close WRITE; @output = <READ>; close
READ; print @output;'
Current time is:
Thu Jul 11 01:36:12 PDT 2013
On Fri, Jun 7, 2013 at 7:25 PM, Martin McCormick <martin@...>wrote:
> I have a small perl script which I found as an example that calls the
> omshell, familiar to those who administer DHCP servers. You enter
> commands and get output on stdout.
> I want to capture all that output in a list as in
> @omstrings = < theoutput >;
> but so far, the magic syntax eludes me because the call to omshell is
> part of a larger statement and attempts to use @omstrings = `omshell`,
> something like that just confuses the script. Here it is, slightly
> obfuscated to protect the crown jewels.
> #!/usr/bin/perl -w
> use strict;
> my @omstrings;
> my $mac = "aa:bb:cc:dd:ee:ff";
> my $ip = "192.168.1.54";
> my $name = "zzzzokstate.edu";
> #We need to start capturing output from the omshell.
> open (OMSHELL, "|omshell") || die ("Unable to open omshell\n");
> print OMSHELL "server 192.168.2.3\n";
> print OMSHELL "port 7911\n";
> print OMSHELL "key key_name \"IFiTOLDUIDHAVE2KILLU\"\n";
> print OMSHELL "connect\n";
> print OMSHELL "new host\n";
> print OMSHELL "set name = \"$name\"\n";
> print OMSHELL "set hardware-address = $mac\n";
> print OMSHELL "set hardware-type = 1\n";
> print OMSHELL "set ip-address = $ip\n";
> print OMSHELL "create\n";
> close (OMSHELL) || die "Unable to close omshell.\n";
> As is, with the proper access credentials, this will
> create a static bootP host on the DHCP server but we must
> capture the output from omshell in order to check for errors and
> process the IP address which is delivered in hexadecimal format
> which will confuse some folks so they should not see it in that
> How do I capture all the output while omshell is open?
> One thing that did work was to use standard unix I/O redirection
> as in omshell >somefile but it would be more elegant to capture
> all the output in a perl array and not write to a file unless
> one needs to preserve it for some reason.
> The fact that this is the omshell is almost irrelevant.
> This is an external application that mostly produces standard
> output so the same idea should work if you called /bin/csh or
> Thanks to all for any constructive solutions.
> Martin McCormick WB5AGZ Stillwater, OK
> Systems Engineer
> OSU Information Technology Department Telecommunications Services Group
> Stillwater, Oklahoma
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