Need help with nawk

ryanlum · 04-07-2008, 03:15 PM

hi all,

I got a file that got tonsof record. It looks like this

60175144442 020120732491661399 20080405000452 0
60175144443 020120732491661399 20080405000452 0
60175144444 020120732491661399 20080405000452 0

How am i able to use nawk to check whether the end of the column (column 4) is a 0 or another number?

matthewg42 · 04-07-2008, 03:43 PM

Code:

awk '{ if ($4=="0") { print "yes" } else { print "no" } }'

Looks like telecoms records?

colucix · 04-07-2008, 03:52 PM

You can simply do something like this:

Code:

nawk '! $4 {printf "line %04d has zero\n",NR}' file

in this particular case the expression "! $4" evaluates to true if $4 is not different than zero (remember that in awk any non-zero numeric value or any non-empty string value is true, while any other value - zero or the null string - is false). A more explicit version is simply

Code:

nawk '{if ($4 == 0) printf "line %04d has zero\n",NR}' file

PTrenholme · 04-07-2008, 04:02 PM

1) Perhaps this should be in the "Programming" sub-forum.

2) If nwak is "standard", try $4 != "0" {print}