Array Length Reports as Having Length when it is Empty? Post: 302700517

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Top Forums Shell Programming and Scripting Array Length Reports as Having Length when it is Empty? Post 302700517 by mrm5102 on Thursday 13th of September 2012 01:48:59 PM

09-13-2012

Registered User

Quote:

Originally Posted by mrm5102

Just so I'm understanding arrays correctly, would I have to be explicit in giving it an index in order for it to be considered an array?
Like this: not using this but just an example...

Code:

OUTPUT=$(ps auxww | grep [p]rocessname)

IFS='
'

x=0
for line in $OUTPUT
 do
        PID[$x]=$(echo "$line" | awk -F ' ' {'print $2'})
        x=$(($x+1))
done

Anyway thanks for your suggestion, much appreciated!

Thanks Again,
Matt

Like I said, I'm NOT using this code, I was simply asking if that's how you assign into array elements...!

Quote:

is almost always wrong since you can do it all with awk '{ extract something } ' file-with-9000-lines-of-junk in one operation instead of 9,000.

I get what your saying, and that would be better if I was processing a file with 9,000 lines. BUT in this case I'm only checking "ps auxww" which wouldn't
have more then a TOTAL of a couple hundred processes running and I have never seen more then 3-4 instances of the Daemon that I'm looking for, so "9000 times"
is kind of silly to say...

I get it's MUCH more efficient, but after just trying both ways side-by-side, the difference in speed and cpu is unnoticeable...

Anyway, I appreciate your help and explanations with all this but now I think I'm going to go back and rewrite this whole thing... And try and spend a little time with awk.

So thanks AGAIN for your help!

Thanks Again,
Matt

mrm5102

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igawk

IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME

       igawk - gawk with include files

SYNOPSIS

       igawk [ all gawk options ] -f program-file [ -- ] file ...
       igawk [ all gawk options ] [ -- ] program-text file ...

DESCRIPTION

       Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1).

       AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like

	      @include getopt.awk

       in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path.

OPTIONS

       See gawk(1) for a full description of the AWK language and the options that gawk supports.

EXAMPLES

       cat << EOF > test.awk
       @include getopt.awk

       BEGIN {
	    while (getopt(ARGC, ARGV, "am:q") != -1)
		 ...
       }
       EOF

       igawk -f test.awk

SEE ALSO

       gawk(1)

       Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995.

AUTHOR

       Arnold Robbins (arnold@skeeve.com).

Free Software Foundation					    Nov 3 1999								  IGAWK(1)