printing lines from a file
From: Christopher Spears (cspears2002_at_yahoo.com)
Date: 02/27/05
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Date: Sat, 26 Feb 2005 18:57:52 -0800 (PST) To: beginners@perl.org
Here is some code I am working on:
#!/bin/perl -w
use strict;
my $number_of_args = @ARGV;
open STDERR, ">./caught_errors" or die "Can't create
caught_errors: $!";
if ($number_of_args == 0) {
print "Not enough arguments!\n";
print "Usage: ./cedit somefile.C++\n";
print "Usage (optional): ./cedit somefile.C++
outputfile\n";
} elsif ($number_of_args == 1) {
system "g++", $ARGV[0];
open CAUGHTERRORS, "caught_errors" or die "Can't
open file: $!";
chomp(my $line = <CAUGHTERRORS>);
until (my $line =~ /^\s*$/) {
chomp($line = <CAUGHTERRORS>);
print $line."\n";
}
close CAUGHTERRORS;
} elsif ($number_of_args == 2) {
system "g++", $ARGV[0], "-o", $ARGV[1];
} else {
print "Too many arguments!\n";
print "Usage: ./cedit somefile.C++\n";
print "Usage (optional): ./cedit somefile.C++
outputfile\n";
}
Basically, I am trying automate g++. However, I don't
want any error messages printed to the screen. I want
them saved in a text file called caught_errors. That
part works. After g++ does its business, I want the
script to open the text file and print out any
messages that it sees in there. This is the part I am
having trouble with! This is frustrating because I
know I have done something like this before! Right
now, in caught_errors, I am getting the following
error messages:
hello.c++: In function `int main()':
hello.c++:7: error: syntax error before `return'
Use of uninitialized value in pattern match (m//) at
/home/Christstopher Spears/C++_code/tools/cedit line
16, <CAUGHTERRORS> line 1.
The first two are obviously from the C++ program I
wrote incorrectly to test the script. I don't
understand the third error message. Any hints?
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