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Replace a field where values are null in a file.

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Top Forums Shell Programming and Scripting Replace a field where values are null in a file.
# 8  
Old 06-05-2013
@MadeInGermany
Code:
$3~/^$/

So this is the only solution that represent an empty filed.
Thanks for the information Smilie
# 9  
Old 06-09-2013
@juzzfun, Jotne: if you do not use quotes it will shave off the leading zero of 099990
This User Gave Thanks to Scrutinizer For This Post:
MadeInGermany
# 10  
Old 06-09-2013
Quote:
Originally Posted by MadeInGermany
Note that 1.
Code:
!$3

also replaces fields with 0 or 00,
while 2.
Code:
$3~/^$/

only replaces empty fields.
We had a discussion in another thread about $3=="" that IMHO should be equal to 2.
But Solaris /usr/xpg4/bin/awk (since the patch for bugID 5074811) treats it like 1.
Could you please give me a pointer to the other thread?

I'm curious as to why you believe $3=="" should evaluate to 2 when $3 is an empty field. The standards say:
Quote:
The value of the comparison expression shall be 1 if the relation is true, or 0 if the relation is false.
and a comparison expression is an expression using one of the operators <, <=, !=, ==, >=, or >.
# 11  
Old 06-09-2013
Quote:
Originally Posted by Don Cragun
I'm curious as to why you believe $3=="" should evaluate to 2 when $3 is an empty field.
Hi Don, may be you didn't read MadeInGermany's reply carefully (or may be it was not well explained). I think he meant that $3=="" is equivalent to $3~/^$/ (the 2nd code fragment in his post).
These 2 Users Gave Thanks to elixir_sinari For This Post:
Don Cragun MadeInGermany
# 12  
Old 06-10-2013
Quote:
Originally Posted by juzz4fun
I can use nawk, but just wondering why awk is not working with 1 on my machine Smilie
solaris keeps a stone-age awk around for compatibility reasons. To get the language everyone expects awk to be these days, you use nawk.
# 13  
Old 06-10-2013
Quote:
Originally Posted by Corona688
solaris keeps a stone-age awk around for compatibility reasons. To get the language everyone expects awk to be these days, you use nawk.
They still ship this in SysV R4.0 style i.e. link awk with oawk:
Code:
ls -li /usr/bin/*awk
     54765 -r-xr-xr-x   2 root     bin        89108 Oct  1  2007 /usr/bin/awk
     54744 -r-xr-xr-x   1 root     bin       126944 Oct  1  2007 /usr/bin/nawk
     54765 -r-xr-xr-x   2 root     bin        89108 Oct  1  2007 /usr/bin/oawk
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