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Full Discussion: Pull specific lines from long file based on formula
Top Forums Shell Programming and Scripting Pull specific lines from long file based on formula Post 302509421 by Chubler_XL on Wednesday 30th of March 2011 06:51:34 PM
Old 03-30-2011
Could call quit once the last match if found - stops reading all 10^8 lines when we just wanted 1 - 100:

Code:
limit=100
a=0
b=1
awk -v lim=$limit '
     {   
     for(n=1; n<=lim; n++) 
       { 
          if(NR==a+(b*n) )
            {print $0 ; if (n==lim) quit }
       } '  a=$a b=$b  inputfile > outputfile

 

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LEARN ABOUT DEBIAN

excel::template::element::formula

Excel::Template::Element::Formula(3pm)			User Contributed Perl Documentation		    Excel::Template::Element::Formula(3pm)

NAME

       Excel::Template::Element::Formula - Excel::Template::Element::Formula

PURPOSE

       To write formulas to the worksheet

NODE NAME

       FORMULA

INHERITANCE

       Excel::Template::Element::Cell

ATTRIBUTES

       All attributes a CELL can have, a FORMULA can have, including the ability to be referenced using the 'ref' attribute.

CHILDREN

       None

EFFECTS

       This will consume one column on the current row.

DEPENDENCIES

       None

USAGE

	 <formula text="=(1 + 2)"/>
	 <formula>=SUM(A1:A5)</formula>

	 <formula text="$Param2"/>
	 <formula>=(A1 + <var name="Param">)</formula>

       In the above example, four formulas are written out. The first two have the formula hard-coded. The second two have variables. The third
       and fourth items have another thing that should be noted. If you have a formula where you want a variable in the middle, you have to use
       the latter form. Variables within parameters are the entire parameter's value.

AUTHOR

       Rob Kinyon (rob.kinyon@gmail.com)

SEE ALSO

       CELL

perl v5.14.2							    2010-06-17				    Excel::Template::Element::Formula(3pm)
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