Linux Process Management 1. Write a command that will display the value of the P

Question

Linux Process Management

1. Write a command that will display the value of the PATH variable, insert the output of the

command below it

2. Write a command that will add the directory ~/.bin to the end of your path. Insert the

output of the command below it

3. Write a command that will display the name of every file on the Linux system where the

file content contains the string "Tom Snyder". The command must run in the background, and

must redirect standard error to /dev/null. Insert the output of the command below it

4. Write a command that will display the process ID number and total CPU time for each process

on the system. Insert the output of the command below it.

Explanation / Answer

1. $PATH will give the value of the path variable. Using the pipe operator (|) the output can be forwarded to the next command, that is,
$PATH |

2. Use the export command to modify PATH, enter:
export PATH=$PATH~/.bin

3. You can use the ls command to list the files using wildcard characters. A period . is a wild card, allowing you to substitute for <anything>. The * will let you repeat it 0 or more times.

ls *Tom Snyder*

4. To get the pid of a Running-Program
pgrep:

pgrep [options] pattern
DESCRIPTION : pgrep looks through the currently running processes and lists the process IDs which match the selection criteria to stdout. All the criteria have to match. For example,

To find process named sshd owned by root.

$ pgrep -u root sshd
List the processes owned by root OR daemon.

$ pgrep -u root,daemon
pidof:

DESCRIPTION:

Pidof finds the process id's (pids) of the named programs. It prints those id's on the standard output.

syntax: pidof program_name

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