Basically, you want to

  1. get a line (or undef),
  2. process the line, and
  3. loop if appropriate,

in that order. The following snippets will do just that: 

{
   local $_;
   do {
      $_ = <INHANDLE>;
      ...
   } while defined $_;
}

[download]
for (;;) { # Loop until "last".
   local $_ = <INHANDLE>;
   ...
   last if not defined $_;
}

[download]
{ # Loop while "redo".
   local $_ = <INHANDLE>;
   ...
   redo if defined $_;
}

[download]
my $block = sub { ... };
&$block while <INHANDLE>;
&$block foreach undef;

[download]

All of the snippets set $_ to undef on the last pass.

All of the snippets have access to the lexical variables, package variables and @_ of the parent scope.

Update: Moved local outside of the loop in first snippet.

In reply to Re: Continuing While Loop One Iteration After EOF by ikegami
in thread Continuing While Loop One Iteration After EOF by jcc

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