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Top Forums Shell Programming and Scripting Strange behaviour of arrays in awk Post 302852447 by Scrutinizer on Wednesday 11th of September 2013 02:33:30 PM
Old 09-11-2013
That is standard awk behaviour, arrays are not declared. If you refer to a non-existing array element, it automatically creates it. It does not assign an empty value, but rather it creates an unitialized array element with an empty value.. To test the presence of an array element without creating it, you need the index in array expression.

As for the second part. No, not exactly because of the first condition, which makes that the second part gets executed for some of the lines in file1. Try:

Code:
FNR==NR { 
  if (/file1_l1/) code[$2] = 1
  next
}


Last edited by Scrutinizer; 09-11-2013 at 04:22 PM..
 

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lreplace(n)						       Tcl Built-In Commands						       lreplace(n)

__________________________________________________________________________________________________________________________________________________

NAME
lreplace - Replace elements in a list with new elements SYNOPSIS
lreplace list first last ?element element ...? _________________________________________________________________ DESCRIPTION
lreplace returns a new list formed by replacing one or more elements of list with the element arguments. first and last specify the first and last index of the range of elements to replace. 0 refers to the first element of the list, and end (or any abbreviation of it) may be used to refer to the last element of the list. If list is empty, then first and last are ignored. If first is less than zero, it is considered to refer to the first element of the list. For non-empty lists, the element indicated by first must exist. If last is less than zero but greater than first, then any specified elements will be prepended to the list. If last is less than first then no elements are deleted; the new elements are simply inserted before first. The element arguments specify zero or more new arguments to be added to the list in place of those that were deleted. Each element argu- ment will become a separate element of the list. If no element arguments are specified, then the elements between first and last are sim- ply deleted. If list is empty, any element arguments are added to the end of the list. SEE ALSO
lappend(n), lindex(n), linsert(n), list(n), llength(n), lrange(n), lsearch(n), lsort(n) KEYWORDS
element, list, replace Tcl 7.4 lreplace(n)
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