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07.12.2004 at 07:18PM PDT, ID: 21056413

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7.4

Perl command line Args and file input

Zone: Perl Programming Language

Tags: perl, command, args, line, input

I have a perl file that I run as
./myscript.pl somefile.txt

which parses out some values from a text file that looks like

[1] # join request # [4] other stuff
[3] # join successful # [2] other stuff

etc. where the first number in the brackets stands for a computer number. The result of the program is to count how many times that particular line (like "join request") a particular computer # has.

I want to be able to call my program ( a perl program) like

./myscript.sh somefile.txt some text to get

where "some text to get" is taken in from the argument and then i can get any value from that file from the command line. Currently, I am hardcoding whihc line / value I parse out in the following file:

Any idea how to do the input from command line / parse from args?

Thanks!

-Edward

#!/usr/bin/perl -s

my %messageCount=();
my %internalCount=();

main();

sub main(){

while (<>) {
@line = split(/\#/);

if((/join request/)){
#print $line[0];

$node = $line[0];
$node =~ /\[(\d*)\]/;
print $1;

$messageCount{$1} = $messageCount{$1} + 1;

}

}

while ( my ($key, $value) = each (%messageCount)){
chomp ($key);
print "$key $value\n";
}

}

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Question Stats

Zone: Programming

Question Asked By: edwardt

Solution Provided By: lwadwell

Participating Experts: 5

Solution Grade: A

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07.12.2004 at 07:19PM PDT, ID: 11535498

edwardt:

Oh - and I have a problem where it doesn't print out sequentially for some reason - if you can help in fixing that (sequentially by computer #) that would be helpful

Thanks!

-Edward

07.12.2004 at 08:08PM PDT, ID: 11535687

lwadwell:

There are a couple of options for the command line options:

1. use perl's standard array that contains the the arguements...'@ARGV'. Where $ARGV[0] is the first option, $ARGV[1] is the second...etc.
2. Or (my preferred) use the perl module 'Getopt'...or even better, 'Getopt::Long' to use more standard unix style options.

So your script could become something like...

#!/usr/bin/perl -s
use strict;

my $filename = $ARGV[0];
my $searchstr = $ARGV[1];

print "Searching file $filename for string $searchstr \n";

parse_file(); # I avoid using main as a subroutine name...

sub parse_file() {
my %messageCount = ();

open(INFILE, "$filename") or die "Cannot open file $filename $!";

while (my $line = <INFILE>) {
$messageCount{$1}++ if ($line =~ /\[(\d*)\]\s*\#\s*$searchstr\s*\#/); # may as well use a single regexp for this.
}
close(INFILE);

foreach my $key (sort keys %messageCount)) {
print "$key $messageCount{$key}\n";
}
}
## END Program

and call it like

./myscript.pl [file to search] [string to match]

Accepted Solution

07.12.2004 at 08:28PM PDT, ID: 11535765

lwadwell:

Woops, sorry too many brackets...line
foreach my $key (sort keys %messageCount)) {
should be
foreach my $key (sort keys %messageCount) {

let me explain the script a little better...

1. I am just using the @ARGV array to get the command line options...assuming the the first one is the file and the second is the string.

2. I am explicitly opening the file for reading...'open(INFILE, "$filename")'

3. '$messageCount{$1}++' is the same as '$messageCount{$1} = $messageCount{$1} + 1'. The '++' operator is used to add 1 to a variable.

4. The regexp (or regular expression) $line =~ /\[(\d*)\]\s*\#\s*$searchstr\s*\#/ is matching on...
a square opening bracket, ie the '\[', followed by
any number of digits, ie the \d*...and returning them in $1 by surrounding this in the round brackets...ie (\d*), followed by
any amount of white space, ie the \s*, foillowed by
a hash symbol, ie the \#, followed by
any amount of white space, ie the \s*, foillowed by
the desired search string, as contained in the variable $searchstr, followed by
any amount of white space, ie the \s*, foillowed by
a hash symbol, ie the \#

5. I close the open file...'close(INFILE)'

6. Then sort the values used as keys in the hash...'sort keys %messageCount'

07.13.2004 at 07:15AM PDT, ID: 11539130

GrayGh0st:

Just a little thing, but for ARGV[1] to get the entire search string, he would need to surround it with double quotes, correct? Otherwise, the whitespace delimited words would be in ARGV[2..n], I believe.

Justin

07.13.2004 at 07:26AM PDT, ID: 11539247

Rank: Wizard

FishMonger:

The sample file contents appears to have multiple "fields" per line which may or may not be for the same computer, so just to be sure, you may want to put the g (global) modifier on the end of the regex.

07.14.2004 at 02:34AM PDT, ID: 11546998

bugecdysis:

Assuming the first argument is the file spec and the rest is one search term:

die "usage: $0 filename search term\n" if $#ARGV < 1;

my (%messageCount, %internalCount);

# create search term from command line
my $pattern = join('\s+', @ARGV[1..$#ARGV]);
# escape any funny characters (like .)
$pattern =~ s/([^a-zA-Z0-9 ])/\\$1/g;
# reduce list to 1 file spec
$#ARGV = 0;

while (<>) {
$messageCount{$1}++, print $1 if /^[^#]*\[(\d+)\][^#]*$pattern/;
}
foreach (sort keys %messageCount) {
print "$_ $messageCount{$_}\n";
}

07.14.2004 at 04:18AM PDT, ID: 11547643

Rank: Guru

ahoffmann:

open(F,"<$ARGV[0]") and @f=<F>;
foreach $l (@f){$l=~m/^(\[\d+\])\s*#\s*($ARGV[1]).*/;$n=$1;$c{"$n"}++;}
while (($k,$v)=each %c){print "$k=$v"};'
# to be improved in many ways

07.14.2004 at 06:23PM PDT, ID: 11555215

edwardt:

Hi,

I have a minor problem with the

foreach my $key (sort keys %messageCount){
chomp ($key);
print "$key $messageCount{$key}\n";
}

It prints out my numbers like
10 1
11 1
12 2
13 1
14 5
15 8
16 15
17 10
18 13
19 1
2 1
20 3
3 1
4 1
5 1
6 6
7 1
8 1
9 1

I guess I could go into excel and do a sort - but if it can sort the keys based on numbers instead of string, that woudl be helpful.
Thanks.

-Edward

07.14.2004 at 06:41PM PDT, ID: 11555269

lwadwell:

for a numberic sort, try...

foreach my $key (sort {$a <=> $b} keys %messageCount) {

20080236-EE-VQP-29