Process information with Perl - UNIX Systems Programming - Engineering Assessment Answer

Engineering Assessment Task

Title: Process information with Perl
In this assignment, you will write a Perl program that reads from a file similar to the output of Unix’ command ps (information about the processes running on a Unix computer). These are the specifications for your Perl program:
1. The file containing your program must be named pslog.pl
2. Your program must use the following syntax: pslog.pl option argument_file
Your program must check that the argument_file argument is an existing and readable file.
If not, it must print a message of your choice to the standard output and exit. The format for file argument_file and the values for the option argument are described below.
3. File argument_file can have any arbitrary name. It must be a file of text with the following format:
a. The file consists of an arbitrary, yet reasonable, number of lines (including, possibly, zero lines). Each line corresponds to a process.
b. Each line must contain four fields separated by one or more space characters.
c. The four fields are: process ID, terminal, time and command name.
d. Field process ID is a string of characters representing an integer between 0 and 32768. If the string’s length is less than 5 characters, this field is padded to the left with space characters (see the examples below).
e. Field terminal is a string of minimum 1 / maximum 8 characters representing the terminal associated with the process.
f. Field time is a string of 8 characters representing the cumulated CPU time in format hours(2 digits):minutes(2 digits):seconds(2 digits). Examples: 66:45:52; 00:00:00; 00:05:00; 08:11:01; 99:59:59.
g. Field command name is a string of characters with the name of a command.

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