in reply to •Re: Re: Simple command line calculator
in thread Simple command line calculator

perl -ple'$_=eval'

[download]
is a bit easier to use :) 

U28geW91IGNhbiBhbGwgcm90MTMgY
W5kIHBhY2soKS4gQnV0IGRvIHlvdS
ByZWNvZ25pc2UgQmFzZTY0IHdoZW4
geW91IHNlZSBpdD8gIC0tIEp1ZXJk

Replies are listed 'Best First'.
Re: Re: •Re: Re: Simple command line calculator
by Rich36 (Chaplain) on Mar 14, 2002 at 22:28 UTC
    How would you pass parameters to that expression?
    Rich36
    There's more than one way to screw it up...
[reply]

      How would you pass parameters to that expression? 

      2;130 juerd@ouranos:~$ perl -ple'$_=eval'
1+1
2
3*100
300

      [download]

      U28geW91IGNhbiBhbGwgcm90MTMgY
W5kIHBhY2soKS4gQnV0IGRvIHlvdS
ByZWNvZ25pc2UgQmFzZTY0IHdoZW4
geW91IHNlZSBpdD8gIC0tIEp1ZXJk

[reply]
[d/l]
Re: Re: •Re: Re: Simple command line calculator
by toku (Novice) on Mar 19, 2002 at 16:17 UTC
    You can make this take a command argument very easily. In fact you can replace the expr function with this: 
    function calc {
   perl -ple '$_=eval'
}

function expr {
   echo "$1" | calc
}

    [download]
    Toku
[reply]
[d/l]

      How about a Perl solution? 

      perl -le'print eval shift'

      [download]
      Or, to slurp all arguments: 
      perl -le'print eval "@ARGV"'

      [download]

      U28geW91IGNhbiBhbGwgcm90MTMgY
W5kIHBhY2soKS4gQnV0IGRvIHlvdS
ByZWNvZ25pc2UgQmFzZTY0IHdoZW4
geW91IHNlZSBpdD8gIC0tIEp1ZXJk

[reply]
[d/l]
[select]

In Section Cool Uses for Perl