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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 NETBSD

uniq

UNIQ(1) 						    BSD General Commands Manual 						   UNIQ(1)

NAME

     uniq -- report or filter out repeated lines in a file

SYNOPSIS

     uniq [-cdu] [-f fields] [-s chars] [input_file [output_file]]

DESCRIPTION

     The uniq utility reads the standard input comparing adjacent lines, and writes a copy of each unique input line to the standard output.  The
     second and succeeding copies of identical adjacent input lines are not written.  Repeated lines in the input will not be detected if they are
     not adjacent, so it may be necessary to sort the files first.

     The following options are available:

     -c      Precede each output line with the count of the number of times the line occurred in the input, followed by a single space.

     -d      Don't output lines that are not repeated in the input.

     -f fields
	     Ignore the first fields in each input line when doing comparisons.  A field is a string of non-blank characters separated from adja-
	     cent fields by blanks.  Field numbers are one based, i.e. the first field is field one.

     -s chars
	     Ignore the first chars characters in each input line when doing comparisons.  If specified in conjunction with the -f option, the
	     first chars characters after the first fields fields will be ignored.  Character numbers are one based, i.e. the first character is
	     character one.

     -u      Don't output lines that are repeated in the input.

     If additional arguments are specified on the command line, the first such argument is used as the name of an input file, the second is used
     as the name of an output file.

     The uniq utility exits 0 on success, and >0 if an error occurs.

COMPATIBILITY

     The historic +number and -number options have been deprecated but are still supported in this implementation.

SEE ALSO

     sort(1)

STANDARDS

     The uniq utility is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible.

BSD
								  January 6, 2007							       BSD
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