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How do you execute a UNIX command in the background?

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To run the count program, which will display the process identification number of the job, enter: count &

To check the status of your job, enter: ps

To bring a background process to the foreground, enter: fg

If you have more than one job suspended in the background, enter: fg %#

Replace # with the job number, as shown in the first column of the output of the jobs command.

You can kill a background process by entering: kill PID

Replace PID with the process ID of the job. If that fails, enter the following:

kill -KILL PID

To determine a job's PID, enter: jobs -l

If you are using sh, ksh, bash, or zsh, you may prevent background processes from sending error messages to the terminal. Redirect the output to /dev/null using the following syntax: count 2> /dev/null &

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Sunday, May 11, 2008

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Network Administrator

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181

How would you change all occurrences of a value using VI?

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%s/(old value)/(new value)/g

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Give two UNIX kernel parameters that effect an Oracle install.

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SHMMAX & SHMMNI

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Briefly, how do you install Oracle software on UNIX?

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Basically, set up disks, kernel parameters, and run orainst.

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What is the difference between a soft link and a hard link?

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A symbolic (soft) linked file and the targeted file can be located on the same or different file system while for a hard link they must be located on the same file system.

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Give the command to display space usage on the UNIX file system.

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df -lk

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236

Explain iostat, vmstat and netstat

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iostat reports on terminal, disk and tape I/O activity. vmstat reports on virtual memory statistics for processes, disk, tape and CPU activity. netstat reports on the contents of network data structures.

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Explain the read, write, and execute permissions on a UNIX directory

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Read allows you to see and list the directory contents. Write allows you to create, edit and delete files and subdirectories in the directory. Execute gives you the permissions to run programs or shells from the directory.

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