Steps for Script

1. Perform the following actions
   • Run ls on a file that does not exist
   • Run ls on the same file, but redirect Standard Error to /dev/null
   • Run ls on the same file, but redirect Standard Error to errors.txt
   • Print errors.txt to the terminal
   Run one command for each of the items above.
2. Using 3 commands on the same command line
   • Go to your home directory
   • Run ls
   • Return to your hw08 directory
3. Copy bother10.sh from /home/ckelly/course_files/it244_files to your hw08 directory.
   Write a single command line that
   • Run bother10.sh in the background sending the output to /dev/null
   • Run bother10.sh in the background sending the output to /dev/null
   • Run bother10.sh in the background sending the output to /dev/null
   • Run ps in the foreground
4. Using the directory stack mechanism do the following
   • Go to your home directory
   • Show your position in the filesystem
   • Go to my home directory
   • Show your position in the filesystem
   • Return to your home directory
   • Show your position in the filesystem
   • Return to you hw08 directory
   • Show your position in the filesystem
5. Do the following
   • Create the local variable foo and assign it the value "FOO"
   • Create the global variable bar and assign it the value "BAR"
   • Write a single command that will print the values of foo and bar
6. Copy print_foo_bar.sh from /home/ckelly/course_files/it244_files to your hw08 directory.
   Run print_foo_bar.sh.
   foo will not print because it is local to the login shell and cannot be seen in a subshell.
7. Do the following
   • Create the global variable my_city and assign it the name of the town you live in
8. Print the value of the keyword shell variable whose value is a list of all the directories Bash will search to find an executable file with the same name as the command you typed on the command line.
9. Print the value of the keyword shell variable whose value is the absolute pathname of your default shell.
10. Run a command that will show you all your global variables.