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Full Discussion: Find pattern in first field of file
Top Forums Shell Programming and Scripting Find pattern in first field of file Post 302957960 by Aia on Saturday 17th of October 2015 02:13:28 AM
Old 10-17-2015
An Awk version
Code:
awk '
FNR==NR {                     # prevents loading Content.txt into array s   
    s[$0]                     # load Pattern.txt file into array s
    next                      # move to process next line of Pattern.txt
}
{
    for (p in s){             # iterate each pattern
        if(match($1, p)){     # check pattern for match against first field
            print             # print record if match is found
            next              # stop pattern iteration for this record, match was found already
        }
    }
}' Pattern.txt Content.txt

Perl version
Copy as search.pl and run as perl search.pl Pattern.txt Context.txt
Code:
#!/usr/bin/perl

# search.pl
# Perl facilities to help avoiding errors
use strict;
use warnings;

# files names to obtain from command line
my $pattern_file = shift or die;
my $context_file = shift or die;

# open pattern file for read
open my $fh, '<', $pattern_file or die;
# load pattern file into an array
my @patterns =<$fh>;
# dismiss patterns file handle
close $fh;
# remove the newline at end of record
chomp(@patterns);

# open context file for read
open $fh, '<', $context_file or die;
# iterate line by line through the context file
while(<$fh>) {
    # obtain the first field
    my ($field) = split;
    # search field for pattern; move to next line if match found
    for my $p (@patterns) {
        $field =~ /$p/ and print and next;
    }
}
# dismiss context file handle
close $fh;

This User Gave Thanks to Aia For This Post:
krsnadasa
 

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GRUB-RENDER-LABEL(1)                                               User Commands                                              GRUB-RENDER-LABEL(1)

NAME

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SYNOPSIS

       grub-render-label [OPTION...] [OPTIONS]

DESCRIPTION

       Render Apple .disk_label.

       -b, --bgcolor=COLOR
              use COLOR for background

       -c, --color=COLOR
              use COLOR for text

       -f, --font=FILE
              use FILE as font (PF2).

       -i, --input=FILE
              read text from FILE.

       -o, --output=FILE
              set output filename. Default is STDOUT

       -t, --text=STRING
              set the label to render

       -v, --verbose
              print verbose messages.

       -?, --help
              give this help list

       --usage
              give a short usage message

       -V, --version
              print program version

       Mandatory or optional arguments to long options are also mandatory or optional for any corresponding short options.

REPORTING BUGS

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SEE ALSO

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              info grub-render-label

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