Shell Programming and Scripting

Hi everyone,

Sorry I keep asking these stupid perl questions here. They're not any sort of assignment or anything like that, I'm just browsing through the book "Learning Perl" and I'm finding that I can do some of their practice exercises just fine, but others give me some trouble.

Right now I am trying to make a two programs. One of them has input of two different file numbers, both in ascending order. These files contain numbers, and these numbers are displayed in ascending order. The array needs to be built before it is displayed, and you are not allowed to use any sorting technique (the numbers have to be put in the result one at a time).

They give you a hint that says that the first number from the second file can be identified by it being the first one that is smaller than the previous number.

Another one that I have yet to figure out is where the input is a file that contains a list of stack commands, one per line, and has the form operation: value, specified on the command line.

The output is a stack, displayed after each command is read and executed. It says that the possible commands are push, pop, shift, and unshift, and the values can be strings or numbers.

Like I said, I've been able to do most of these, but these are a few of the ones that I haven't been able to get to work correctly. Any help would be greatly appreciated!

Thanks all,

Jason

"Learning Perl" exercise answers are in Appendix A