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Full Discussion: How to count pattern in column
Top Forums Shell Programming and Scripting How to count pattern in column Post 302149045 by ahjiefreak on Tuesday 4th of December 2007 05:34:28 PM
Old 12-04-2007
Hi,

Could you please explain to me what is the context of :-

nawk -v pat='^&*#' -f ah.awk myFile

Where do ah.awk comes? I assume "myFile" is the existing shell script.

And honeslty the code you shown me just stunned me. Correct me if I am wrong.

From my understanding,the first thing is to compare the blank spaces, and insert the patterns to pat array?

From the pat array which contain [%,$,`] , then you split the pat array to pat2 which holds the number of elements of pattern.

From these number of patterns, then what I could not really understood is:-

for(i=1; i <= patN; i++)
printf(" %d '%s' %s", gsub(patA[i], "", $0), patA[i], (i==patN) ? "\n" : "")

In this for loop, from 1 to number of lines in the file, you are trying to somehow check the pattern? But I do not really understand especially on
gsub(patA[i], "", $0), patA[i], (i==patN) ? "\n" : "") doing. Perhaps you could help to shed some light on this.

Sorry as I am quite new to the shell programming.

P/s: Is there any other ideas which we could use just awk and for loop without using the "ah.awk"?


Rgrds,
Jason
 

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LEARN ABOUT OPENSOLARIS

lptest

lptest(1B)					     SunOS/BSD Compatibility Package Commands						lptest(1B)

NAME

       lptest - generate line printer ripple pattern

SYNOPSIS

       /usr/ucb/lptest [length [count]]

DESCRIPTION

       The  lptest  utility  writes the traditional ripple test pattern to the standard output. In 96 lines, the ripple test pattern prints all 96
       printable ASCII characters in each position. The ripple test pattern was originally created to test printers.  It is also useful for  test-
       ing terminals, driving terminal ports, debugging, and performing tasks that require a quick supply of random data.

       This command is obsolete.

OPTIONS

       length	 Specifies the length of the output line in characters. 79 characters is the default.

       count	 Specifies the number of output lines. 200 lines is the default. If  count is specified, length must also be specified.

EXIT STATUS

       The following exit values are returned:

       0	   Successful completion.

       non-zero    An error occurred.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWscplp 		   |
       +-----------------------------+-----------------------------+

SEE ALSO

       attributes(5)

SunOS 5.11							    9 Sep 1996								lptest(1B)
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