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Full Discussion: [Help] PERL Script - grep multiple lines
Top Forums Shell Programming and Scripting [Help] PERL Script - grep multiple lines Post 302267530 by otheus on Friday 12th of December 2008 03:39:25 PM
Old 12-12-2008
Sounds pretty simple. But I'm not sure if there should be MULTIPLE generation IDs or not. Let's assume so. So let's say you pass the variables on the command line to your new script:
Code:
$ your-script.pl $from_month $from_year $to_month $to_year

So now you want a script to read these four arguments, run through the named file, and save it to another file, right? So:
Code:
$ your-script.pl $from_month $from_year $to_month $to_year <data.txt >genid.txt

Now comes the script:
Code:
#!/usr/bin/perl -w

# Create lookup table for Month specification so we can 
# determine which month-name is before/after another month name
%Month = ( Jan => 1, Feb => 2, Mar => 3, Apr => 4, May => 5, Jun => 6, Jul => 7, 
 Aug => 8, Sep => 9, Oct => 10, Nov => 11, Dec => 12 );

# Get arguments from command line
($from_month, $from_year, $to_month, $to_year) = @ARGV;

# loop through each input line
while (<>) { 
  # "remember" gen_id for next line of input. 
  $gen_id = $1
     if /^\s*Generation (\d+)/;

  # if the shoe fits...
  if (/imported at \w+ (\w+) .* (\d{4})\s*$/ 
    && $2 >= $from_year && $2 <= to_year
    && $Month{$1} >= $Month{$from_month}
    && $Month{$1} <= $Month{$to_month}
  ) { 
     print $gen_id,"\n";
  }
}

 

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LEARN ABOUT MINIX

zgrep

ZGREP(1)                                                      General Commands Manual                                                     ZGREP(1)

NAME

       zgrep - search possibly compressed files for a regular expression

SYNOPSIS

       zgrep [ grep_options ] [ -e ] pattern filename...

DESCRIPTION

       Zgrep  invokes  grep  on  compressed  or  gzipped  files.   These  grep  options  will  cause  zgrep  to  terminate  with  an  error  code:
       (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*).  All other options specified are passed directly to grep.  If no file is specified,  then  the
       standard input is decompressed if necessary and fed to grep.  Otherwise the given files are uncompressed if necessary and fed to grep.

       If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.

EXIT CODE

       2 - An option that is not supported was specified.

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

       grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)

                                                                                                                                          ZGREP(1)
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