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Shell Programming and Scripting

How to make AWK process an input file many many times?

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Top Forums Shell Programming and Scripting How to make AWK process an input file many many times?
# 8  
Old 05-14-2010
Quote:
Originally Posted by kevintse
[...]
or just put "ARGV[ARGC++] = ARGV[ARGC-1]"(thanks for radoulov's code) at the end of each processing.
You could manipulate the ARGV array in the BEGIN block as you like:


Code:
awk -vl=<times> 'BEGIN {
  f = ARGV[ARGC-1]
  while (++i <= l)
    ARGV[ARGC++] = f
  }
1' file

For example:

Code:
% echo in file >file

To read the input file 3 times:

Code:
% awk -vl=3 'BEGIN {
  f = ARGV[ARGC-1]
  while (++i< l)
    ARGV[ARGC++] = f
  }
1' file      
in file
in file
in file

To read it 10 times:

Code:
% awk -vl=10 'BEGIN {
  f = ARGV[ARGC-1]
  while (++i< l)
    ARGV[ARGC++] = f
  }
1' file                  
in file
in file
in file
in file
in file
in file
in file
in file
in file
in file

Note that the -vvar syntax (without a space between -v and the identifier) is a GNU awk extension. With other awk implementations you should use -v var (with a space).
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