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it WORKED! thank you! thank you! thank you!!!!

here it is:

:~/desktop] Audrey% cat num3.txt
1 3
3 12
12 14
14 21
0 34
34 34
34 40
40 90

i appreciate input, I have tried both, however nothing is incremented in the finished file, and there are no errors -- what do you think may be the problem??

:~/desktop] Audrey% awk '$1||$2++'...

given I am using tcsh, and I need to use awk-if command

Basically, logic is as follows -
If some value in column one is equals to 0, then increment the corresponding value in column 2 by one.
...

thank you for you input.
i tried awk '!$1{$2+=1}1', however it gives me a bunch of errors. problem is that can not decipher the syntax of this awk expression for successful debugging. would you...

2 21
1 12
3 123
4 1234
6 49
0 49
33 212

I need to replace/increment all the values in the 2nd column that correspond to 0 in the first...