while(<>){
  push @array,(split/~/)[1];
}
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And an explanation, as you're a newbie:

while(<>) {

This bit reads every line from your file (if you've specified your file name on the command line, e.g. "./myscript.pl filename.txt")

push @array,(split /~/)[1];

split /~/ takes the current line, and splits it into an array on the ~ character.

(split /~/)[1] takes the second element of that array. That's staffid, the bit you want. Similarly print( ('a','n','d')[1] ) would print "n".

push @array, ... just adds this to your array.

dave hj~