Re: writing to stdin

Well.. try something like:

 print "Are you sure? [y]";
 chomp(my $ans = <STDIN>);
 $ans ||= "y";
 if ($ans =~ m!^y(es)?!) {
    # do something
 } else {
    # do otherthing
 }
[download]

Update: added missing chomp thanks to cog. Added some more code as asked by virtualsue.

Alberto Simões

Comment on Re: writing to stdin Download Code

Replies are listed 'Best First'.
Re^2: writing to stdin by cog (Parson) on Mar 28, 2005 at 14:31 UTC
There are two problems with the code... First, it's not case-insensitive... Secondly, an answer such as "y should I?" will match :-) This will do the trick: `print "Are you sure? [y]"; chomp(my $ans = <STDIN>); $ans \|\|= "y"; if ($ans =~ m!^y(es)?$!i) { # do something } else { # do otherthing }` [download] And another approach: `#!/usr/bin/perl print "Are you sure? [y]"; if (<> =~ /^(y(es)?)?\n$/i) { # answer was yes } else { # answer was no }` [download]	[reply] [d/l] [select]
Re^2: writing to stdin by cog (Parson) on Mar 28, 2005 at 13:18 UTC
Actually, there's a `chomp $ans;` missing (otherwise, one could write `my $ans = <STDIN> \|\| 'y';`, which would be quite cool...)	[reply] [d/l] [select]
Re^2: writing to stdin by virtualsue (Vicar) on Mar 28, 2005 at 13:25 UTC
Other than the chomp problem, this code will interpret the answer "yes" as no. Maybe this is trivial, but I think it's nice to make the extra effort to do what the user really wants. :-)	[reply]


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