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Full Discussion: grep and awk
Top Forums UNIX for Dummies Questions & Answers grep and awk Post 302174609 by ShawnMilo on Tuesday 11th of March 2008 02:58:27 PM
Old 03-11-2008
Quote:
Originally Posted by melanie_pfefer
Many thanks
You're very welcome. I realize that I should probably explain it a bit.

Code:
cat temp.txt | perl -pe 's/^.*\s+(\d+\s+mhz).*$/CPU speed: $1/i' | sort -u

This uses a regular expression to find everything from the beginning of the line (^.*) up to one or more blank spaces (\s+), followed by one or more digits followed by a space and the letters "mhz" (\d+\s+mhz). It then captures everything else up to the end of the line (.*$). Surrounding the part I want in parenthesis lets me refer to it later with $1 (additional sections would be $2, etc.). It's case-insensitive because of the "i" after the final forward-slash.

Then, "sort -u" makes the output unique. So if all the lines are the same, there will only be one line of final output. If three lines were the same and one was different, there would be two lines of output -- one of each. Making the "sort -u" into "sort | uniq -c" would print out how many of each value there were.

ShawnMilo
 

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LEARN ABOUT CENTOS

x86info

x86info(1)						      General Commands Manual							x86info(1)

NAME

       x86info -- display x86 CPU diagnostics

SYNOPSIS

       x86info	[-a]   [-c]   [-f]  [fB-F]   [-m]  [-mhz]   [-r]   [?]	 [--all]  [--cache] [--flags] [--verbose]  [--msr]  [--mhz]  [--registers]
       [--help]

DESCRIPTION

       This manual page documents x86info, a program which displays a range of information about the CPUs present in an x86 system.

       In order to make full use of this program you need to have the CPU ID and MSR device drivers in your kernel with  accessible  device  files
       /dev/cpu/<n>/cpuid and /dev/cpu/<n>/msr.

OPTIONS

       This program follows the usual GNU command line syntax, with long options starting with two dashes (`-').  A summary of options is included
       below.

       ?	   --help
		 Show summary of options.

       -a	    --all
		 Show all information.	Equivalent to -c -f -m	    -r -mhz.

       -c	    --cache
		 Show TLB, cache sizes and cache associativity.

       -f	    --flags
		 Show CPU feature flags.

       -m	    --msr
		 Dump model specific registers.  This feature is currently only supported on a few  different  processors.  Future  versions  will
		 include parsing of bits in MSRs for all processors.

       -mhz	      --mhz
		 Estimate current clock rate.

       -mp	      --mptable
		 Dump MP table showing CPUs BIOS knows about.

       -r	    --registers
		 Show register values from all possible cpuid calls.

       -s	    --show-machine-check
		 Show machine check exception information.

       -v	    --verbose
		 Show verbose descriptions.

AUTHOR

       x86info was written by Dave Jones <davej@redhat.com>.

       This manual page was written by Mark Brown <broonie@debian.org> for the Debian GNU/Linux system (but may be used by others).

       Permission is granted to copy, distribute and/or modify this document under the terms of the GNU General Public License version 2.

																	x86info(1)
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