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Top Forums Shell Programming and Scripting Perl - Extract first column from file Post 302923228 by Corona688 on Friday 31st of October 2014 11:10:07 AM
Old 10-31-2014
This is a bit more terse:

Code:
open(OUTFILE, ">Output.dat") || die("Couldn't open Iutput.dat");
open(INFILE, "<Input.dat") || die("Couldn't open Input.dat");
        while(@F = split(/\s+/, <INFILE>)) { print OUTFILE "$F[0]\n" }
close(OUTFILE); close(INFILE);

 

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PR(1)							      General Commands Manual							     PR(1)

NAME
pr - print file SYNOPSIS
pr [ option ... ] [ file ... ] DESCRIPTION
Pr produces a printed listing of one or more files on its standard output. The output is separated into pages headed by a date, the name of the file or a specified header, and the page number. With no file arguments, pr prints its standard input. Options apply to all following files but may be reset between files: -n Produce n-column output. +n Begin printing with page n. -b Balance columns on last page, in case of multi-column output. -d Double space. -en Set the tab stops for input text every n spaces. -h Take the next argument as a page header (file by default). -in Replace sequences of blanks in the output by tabs, using tab stops set every n spaces. -f Use formfeeds to separate pages. -ln Take the length of the page to be n lines instead of the default 66. -m Print all files simultaneously, each in one column. -n Number the lines of each file. -on Offset the left margin n character positions. -sc Separate columns by the single character c instead of aligning them with white space. A missing c is taken to be a tab. -t Do not print the 5-line header or the 5-line trailer normally supplied for each page. -wn For multi-column output, take the width of the page to be n characters instead of the default 72. SOURCE
/sys/src/cmd/pr.c SEE ALSO
cat(1), lp(1) PR(1)
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