Question

What are the exact commands I should use to complete the task.

1. Using the ps –ef and grep command list all processes started by you (i.e. owned by your userid). (Hint: ‘^userid’ with match with a line that start with userid.)

2. Run command group (echo “Snoozing…”; date; sleep 50; echo “Awake.”;date ) > sleep.out & Note: Do not omit the parenthesis!!!

3. Repeat 1, identify process number of the process sleep

4. Display the content of file sleep.out

5. Kill the sleep process

6. Repeat 1. and verify that the process sleep no longer exist

7. Display the content of file sleep.out

8. Remove file sleep.out

Answer 1

Command Sequence:

Note:: $ is used before every command to indicate that following text is command.

So, $ is not part of command.

1. Using the ps –ef and grep command list all processes started by you

(i.e. owned by your userid). (Hint: ‘^userid’ with match with a line

that start with userid.)

Answer:

$ ps -ef | grep "^userid"

Note: "ps" lists the processes that running at present.

-e option makes ps command list all the processes.

-f option makes ps command list the processing in full format

"grep" command returns lines which match the given pattern.

2. Run command group

(echo “Snoozing…”; date; sleep 50; echo “Awake.”;date ) > sleep.out &

Note: Do not omit the parenthesis!!!

Answer:

$ (echo “Snoozing…”; date; sleep 50; echo “Awake.”;date ) > sleep.out &

Note:

'echo' command- print statements to standard output

'sleep 50' command - starts the sleep process which is of duration 50 seconds

'date' command - returns the current date

'> sleep.out' This shell operator is used to redirect the output. Here output

will be redirected to sleep.out

'&' makes the command group run in the background.

3. Repeat 1, identify process number of the process sleep

Answer:

$ ps -ef | grep "^userid"

4. Display the content of file sleep.out

Answer:

$ cat sleep.out

Note: cat command displays the contents of a file.

5. Kill the sleep process

Answer:

$ kill sleep_process_id

Note: Here sleep_process_id is from Step 3.

The sleep_process_id is at the first column value and seventh

column value must be "sleep" i.e process name.

Note:

kill command terminates the process with given id.

6. Repeat 1. and verify that the process sleep no longer exist

Answer:

$ ps -ef | grep "^userid"

7. Display the content of file sleep.out

Answer:

$ cat sleep.out

Note: "cat" command is used to display the file contents.

8. Remove file sleep.out

Answer:

$ rm sleep.out

Note: "rm" command is used to remove the files.

Example-Screenshot: