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My example didn't have the field separator.


$ awk -F\t -f what.awk what.txt


But it is definitely == :)

= would give you every line back, regardless of number of fields.

= is wrong. It will assign 2 to NF, not test if the value of NF is 2.

The contents of what.awk, I imagine, should be:


NF == 2 {print $1, "[LABEL=" $2 "]"}



$ cat what.awk
NF == 2 {print $1, "[LABEL=" $2 "]"}

$ cat what.txt
a b
c d e f
g h

$ awk -f...

This NF = 2 should be this NF == 2.

"It gives me errors" is no help. What errors?