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→INVESTIGATION 2: MANAGING PROCESSES
# Make certain that you are logged into your Matrix account.<br><br>The '''sleep''' command waits for a specified number of seconds before returning to the shell prompt.<br>It is useful in order to force a pause in a sequence of commands. In the tutorial, we will be using<br>this command to '''simulate "long-running" processes''' for us to manage.<br><br>
# Issue the following Linux command: <span style="color:blue;font-family:courier;font-weight:bold">sleep 700</span><br><br>
# Notice that this process will run for '''700 seconds''', and is forcing the user to wait until this process finishes.<br>A process that is '''running in the terminal ''' is referred to as a '''foreground process'''.<br><br>The Unix/Linux system is designed to allow users to send '''preemptive signals''' to manage those processes.<br><br>
# Press the following key combination to '''terminate''' the command running on the terminal:<br><span style="color:blue;font-family:courier;font-weight:bold">ctrl-c</span><br><br>You should notice that the process that was running in the foreground has been '''interrupted''' (i.e. terminated).<br>'''NOTE:''' The '''ctrl-c''' key combination sends '''SIGINT'''<br>('''Signal Interrupt''') signal to terminate a process that is running on the terminal.<br><br>
# Reissue the Linux command: <span style="color:blue;font-family:courier;font-weight:bold">sleep 700</span><br><br>