ftail

        #!/usr/bin/perl

        $| = 1;
        if ($ARGV[0] eq '-e') { shift; $END++ } 
        my $file = shift;

• I didn't bother with Getopt::Std or getopts.pl here

• For a program with one option, this is enough

        my $devino = "";

• As you know, Unix files have ID numbers called i-numbers

• When combined with the disk device numbers, these are unique

• No two files will have the same device number / i-number pair

• $devino is the ID pair for the file ftail thinks it's reading

• If the $devino for the file changes, then ftail is no longer reading the right file

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Copyright © 2012 M. J. Dominus