Thanks all .
On Sat, Nov 28, 2009 at 3:00 AM, Randal L. Schwartz
wrote:
> > "Majian" == Majian writes:
>
> Majian> Hi ,all:
> Majian> I have a problem about this :
>
> Majian> cat test:
> Majian> 12
> Majian> 23
> Majian> 34
> Majian> 45
> Majian> 56
> Majian> 67
>
> Majian> I want to bec
> "Majian" == Majian writes:
Majian> Hi ,all:
Majian> I have a problem about this :
Majian> cat test:
Majian> 12
Majian> 23
Majian> 34
Majian> 45
Majian> 56
Majian> 67
Majian> I want to become like this :
Majian> 1223
Majian> 3445
Majian> 5667
Majian> I thought it for a long time , but I
On Fri, Nov 27, 2009 at 8:34 PM, Majian wrote:
> Could you explain it ?
>
> What is the meaning of the $.? And Why use the "%2" operator?
>
$. means the line number, see perldoc perlvar and look for $.
%2 means the modulus operator.
# perl -le 'print $_%2 for 0..3'
0
1
0
1
HTH.
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On Fri, Nov 27, 2009 at 8:03 PM, Majian wrote:
> Hi ,all:
>
> I have a problem about this :
>
> cat test:
> 12
> 23
> 34
> 45
> 56
> 67
> ...
>
> I want to become like this :
> 1223
> 3445
> 5667
> ...
>
# perl -e '
$m=<) {
chomp if $.%2;
print;
}'
1223
3445
5667
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Hi ,all:
I have a problem about this :
cat test:
12
23
34
45
56
67
...
I want to become like this :
1223
3445
5667
...
That means the next line is after the above line ~
I thought it for a long time , but I have no idea yet~~
Can someone help me ?
Thanks
