how to invoke external program and capture its output
Hi all,
I am using an external binary to view memory starting from a specific address and i want to automate this via PERL however there are problems. Hope you can help me ..thx
I have around 30K of addresses which i want to send each to the programme above and split & save in a seperate log file ..i firstly tried to verify that programme executes and run properly for just 1 address in the list, however i can`t see all the output ( see just 1 line) when i run the perl script below:
============================================================
Code:
#!/usr/bin/perl -w
open (FILE, 'addr.txt');
foreach my $line (<FILE>){
$command = `mem_disp $line 80`;
print "$command";
}
close (FILE);
=============================================================
This gives the following output:
Code:
bash-3.2$ split.pl
sh: line 1: 80: command not found
Opening RO Data Memory File scp.ro
Opening Memory File CP2.16.0000000c.18.pmd.raw
12B21D20 12B6E500 *.... *
-------------------------------------------------------------------
---------- Post updated at 11:23 AM ---------- Previous update was at 11:09 AM ----------
I think perl just cant see 80 in the command ..because the output is same as saying mem_disp <addr> without the number at the end..
Moderator's Comments:
Code tags for code, please.
Last edited by Corona688; 08-03-2012 at 01:30 PM..
I think you need to type ./myscript.pl, not myscript.pl, since PATH doesn't include the current directory for security reasons.
You certainly don't need perl to do something this simple -- especially when all you do in perl is run 30,000 more shells!! This does it all in one shell:
Code:
while read LINE; do mem_disp "$LINE" 80 ; done < input.txt > output.txt
Thx but this is the initial step, I need to split the output and assign them to variables, make some arithmetic operation then save them in a seperate report file . i believe using perl for this makes sense.
Running 30,000 individual, separate shells to run 30,000 commands is wrong, period. That's like making 300 phonecalls to say 300 words. You never have to do that, even if you're processing the result in perl. There's also some useless use of backticks in there, though seeing it in perl is a first.
You could do the loop in shell and feed the result into perl through files or stdin, perhaps.
I don't know why it's taking 80 as a command. It shouldn't be, unless there's odd unprintable characters there which convince it it's on a different line. Or maybe a ; Did you copy-paste the code literally or is it slightly different from what you posted?
hmm thx i got it now ..ok will do that in shell and process the output in perl..well i copied and pasted , script is exactly what you see here ..anyway thanks for advice ,,
Hi,
I have create a Shell Script, with one function.
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Please suggest me,
Regards,
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08-03-2012
