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Full Discussion: Tip: alternative for NR==FNR in awk
Top Forums Shell Programming and Scripting Tip: alternative for NR==FNR in awk Post 302911592 by Don Cragun on Friday 1st of August 2014 02:46:46 PM
Old 08-01-2014
Quote:
Originally Posted by jethrow
Another option would be to just check the filename:
Code:
awk '
BEGIN {f=FILENAME}
FILENAME==f {A[$1]; f=FILENAME; next}
($1 in A)
' file1 file2

This might work on some systems, but the standards say that the value of FILENAME in a BEGIN clause is undefined.

In awk on OS X, FILENAME expands to an empty string (or 0 depending on context) in a BEGIN action.
 

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