Question

1. Write a bash command that will display the value of all environment variables
defined in your shell process, sorted in alphabetical order, and numbered.
Here is a sample of the type of output your command should produce:

1 }
2 ALSA_CONFIG_PATH=/etc/alsa-pulse.conf
3 AUDIODRIVER=pulseaudio
4 BASH_FUNC_mc%%=() { . /usr/share/mc/mc-wrapper.sh
5 COLORTERM=1

2. Write a bash command that will display the value (and only the value) of the
JAVA_ROOT environment variable. Here is a sample of the type of output your
command should produce:

/usr/lib64/jvm/jre

3. Write a bash command that will add your working directory and your home directory
to the current value of the PATH variable. Make sure your new PATH value works
no matter what your current working directory might be.

4. Write a bash command that will display the process ID number and the total CPU time
for each process on the system. Do not display any additional information. Here is a
sample of the type of output your command should produce:

PID TIME
24648 00:00:00
25431 00:00:00
27567 00:00:00
27568 00:00:00
27569 00:00:00
27570 00:00:00

5. Write a bash command that will display the name of every file on the Linux system
whose file contaent contains the string "doug.jones". The command must run in the
background, must redirect standard error to /dev/null, and must redirect standard
output to ~/out.

6. Write a bash command that will kill all of the even-numbered processes associated
with your userid, and no other processes.

7. Write a bash command that will start the program
/home/courses/140u-doug.jones/zombie_maker
as a background process, with standard output redirected to /dev/null.
  
This program will create a zombie process.

8. Write a bash command that will display the process id, parent process id, and wait
channel (search for wchan in man ps) for all zombie processes on the server.
Do not display any additional information.
Here is an example of the type of output your command should produce:

28318 28317 exit

9. Write a bash command that will kill job 1.

10. Write a bash command that will generate a file named
~/cpp_files
that contains the name and absolute path of all files on the system
that contain the line
int main(int argc, char **argv)

The contents of the file ~/cpp_files should be in alphabetical order.
The command you create should run in background, and redirect standard
error to the file ~/stderr.

Answer 1

Answer 1
*********
printenv | nl

Answer 2
********
printenv | grep "jre"

Answer 3
*********
export PATH="$PATH:$pwd

Answer 4
*********
ps -O %px | awk '{print $1 " "$4}'

We are allowed to do only 4 exercise out of any given.

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