Changes

# Issue the following Linux command: <span style="color:blue;font-family:courier;font-weight:bold">sleep 700</span><br><br>'''NOTE:''' The '''sleep ''' command just waits for a specified number of seconds before completing<br>in order to return to the shell prompt. It is useful in order to force a pause in a sequence of commands.<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 key combination: <span style="color:blue;font-family:courier;font-weight:bold">&lt;ctrl&gt;&lt;c&gt;</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''' ('''Signal Interrupt''') to terminate a process that is running.<br><br>

# You should now see output similar to what is displayed below:<br><span style="font-family:courier;font-weight:bold">[1]+ Stopped sleep 700</span><br><br>'''NOTE:''' This indicates that this process has been placed into the '''background'''.<br>This is useful in order to "free-up" the terminal to run other commands.<br><br># Clear your bash shell terminalscreen.<br><br># Issue the following Linux command: <span style="color:blue;font-family:courier;font-weight:bold">jobs</span><br><br>You should see the following output similar that was displayed above:<br><span style="font-family:courier;font-weight:bold">[1]+ Stopped sleep 700</span><br><br>This display indicates that this process (that is now in the background) has '''stopped'''.<br>In other words, the sleep command is NOT counting-down to zero to terminate.<br><br>'''NOTE: ''' You need to use the '''bg''' command to run that process that was sent into the background.<br><br>

# Issue the following Linux command: <span style="color:blue;font-family:courier;font-weight:bold">jobs</span><br><br>You should see the following output similar that was displayed above:<br><span style="font-family:courier;font-weight:bold">[1]+ sleep 700 &</span><br><br>This display indicates that this process in the background is '''running in the background'''<br>(denoted by the ampersand character "&"). Now the command is counting-down to zero.<br><br>

# Issue the following Linux command (using the PID number instead of "PID"):<br><span style="color:blue;font-family:courier;font-weight:bold">kill PID</span><br><br># Issue the '''jobs''' command. Is the sleep process still running?'''NOTE:''' You may need to issue the kill -9 PID command if the previous commands did not work.<br><br># Issue the following Linux command (using the PID number instead of "PID"):<br><span style="color:blue;font-family:courier;font-weight:bold">kill -9 PID</span><br><br># Issue the '''jobs''' command and '''ps''' commands to confirm there are no processes running in the background.<br><br>