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Count in the awk loop if anything else

 3 years ago
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Count in the awk loop if anything else

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can you explain to me why this simple onliner does not work? Thanks for your time.

awk 'BEGIN{i=1}{if($2 == i){print $0} else{print "0",i} i=i+1}' check

input text file with name "check":

a 1
b 2
c 3
e 5
f 6
g 7

desired output:

a 1
b 2
c 3
0 4
e 5
f 6
g 7

output received:

a 1
b 2
c 3
0 4
0 5
0 6


awk 'BEGIN{i=1}{ if($2 == i){print $0; } else{print "0",i++; print $0 } i++ }' check
  • increment i one more time in the else (you are inserting a new line)
  • print the currentline in the else, too
  • this works only if there is only one line missing between the present lines, otherwise you need a loop printing the missing lines

Or simplified:

awk 'BEGIN{i=1}{ if($2 != i){print "0",i++; } print $0; i++ }' check
Tags awk

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