Awk bug
Bill Vaughn
bill at ur-cvsvax.UUCP
Fri Sep 6 08:21:24 AEST 1985
A bug in awk which I thought had been fixed seems to have reappeared in
another situation. It involves the string $0 and how the modification of
individual fields affect it. It seems that the assignment of $0 to a
variable has not been covered by the previous fix. But then, a bare 'print'
statement changes $0 to what one expects it to be!
Check out the following script. (blank lines inserted for readability)
Script started on Thu Sep 5 17:43:58 1985
11> cat /tmp/awks
{$1=""; x[1]=$0; print x[1]}\
{print}\
{y=$0; print y}
12> echo 1 2 3 | awk -f /tmp/awks
1 2 3
2 3
2 3
13> cat /tmp/awks1
{$1=""; print}\
{x[1]=$0; print x[1]}\
{y=$0; print y}
14> echo 1 2 3 |awk -f /tmp/awks1
2 3
2 3
2 3
15> cat /tmp/awks2
{$1=""; y=$0; print y}\
{print}\
{x[1]=$0; print x[1]}
16> echo 1 2 3 |awk -f /tmp/awks2
1 2 3
2 3
2 3
17>
script done on Thu Sep 5 17:49:04 1985
Does anybody know whats going on here? If it's relevant, I'm running 4.2bsd
on a 750. Thanks
_________________________________
\ Bill Vaughn /
\ Center for Visual Science /
/ University of Rochester \
/ rochester!ur-cvsvax!bill \
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