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#!/usr/bin/perl
use warnings;
...
print "@eachwordcmd\n";
print "$eachlinecmd[4]\n";
print "$eachwordcmd[3]\n";

C:\Users\perl514\Documents\perl\practice>perl split.pl

...
Use of uninitialized value $eachlinecmd[4] in concatenation (.) or str
+ing at split.pl line 9.

Use of uninitialized value $eachwordcmd[3] in concatenation (.) or str
+ing at split.pl line 10.