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12.12.2007 at 04:19PM PST, ID: 23020037
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9.2

How to write to output file after pattern match?

Asked by naseeam in Perl Programming Language

Tags: , , , ,

The following makefile runs a perl script.  This perl script writes to the same makefile.

makefile
...
target:  perl script.pl < somefile > makefile
           

target:  OBJS

target:  LDFLAGS += \
   -SEC SECTION1=00010094,SECTION2=000100D4,SECTION3=00010154

...

The following is somefie.

somefile

...
__SYMBOL_ONE          00000198  DAT  ONE
...
__SYMBOL_TWO               00001270  DAT  TWO
...

The attached incomplete perl script reads somefile.  It needs to output to makefile right after -SEC.  Please modify attached perl script so data is printed right after -SEC.

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#!/usr/local/bin/perl -w
 
while (<>) {
    chomp;
    if (/^\s*__SYMBOL_ONE\s*([0-9a-fA-F]+)/) {
        $first_loc = hex($1) ;
    }
    if (/^\s*__SYMBOL_TWO\s*([0-9a-fA-F]+)/) {
        $second_loc = hex($1) ;
    }
}
 
# Find -SEC in the output file. Right after -SEC, need to print following:
printf "\tFIRST=0x%08x, SECOND=0x%08x\n", $first_loc, $second_loc ;
[+][-]12.12.2007 at 07:30PM PST, ID: 20462159

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[+][-]12.12.2007 at 08:48PM PST, ID: 20462450

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[+][-]12.13.2007 at 02:40AM PST, ID: 20463472

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[+][-]12.13.2007 at 05:30AM PST, ID: 20464101

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[+][-]12.13.2007 at 08:23AM PST, ID: 20465385

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[+][-]12.13.2007 at 05:42PM PST, ID: 20469192

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[+][-]12.14.2007 at 10:33AM PST, ID: 20473432

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[+][-]12.14.2007 at 01:43PM PST, ID: 20474712

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About this solution

Zone: Perl Programming Language
Tags: pattern, file, perl, output, write
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Solution Provided By: mjcoyne
Participating Experts: 1
Solution Grade: A
 
 
 
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