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unix linux

Ubuntu Linux Stop a Process

How do I stop a process under Ubuntu Linux using command line and GUI tools?
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Sysadmin because even developers need heroes!!!

Linux / UNIX: See If Particular Users Are Logged Into Server

How do I see if my friends or coworkers are logged into the same Linux or BSD or UNIX (AIX, HP-UX, Apple OS X) server / workstation as I am from a command line?
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Linux / UNIX: Kill User Session

How do I kill all users session under Linux or UNIX operating system using command prompt?
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Linux / UNIX: bc Convert Octal To Hexadecimal or Vise Versa

How do I convert from octal to hex number using bc UNIX / Linux command line utility?
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vi Find And Replace Text Command

How do I find and replace (substitute) test using vi or vim text editor under UNIX / Linux / BSD or Apple OS X operating systems?
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ping command: TTL Expired In Transit Error and Solution

When I try to ping other UNIX / Linux / BSD or MS-Windows servers in our network I get the following message:

TTL Expired In Transit

How do I fix this problem?
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Apache2 NameVirtualHost *:80 has no VirtualHosts Error and Solution

Whenever I try to star my Apache 2 server under UNIX / Linux and get a warning as follows:

[warn] NameVirtualHost *:80 has no VirtualHosts

How do I fix this problem?
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HowTo: Find Symlink under UNIX / Linux

How do I find symlink(s) under UNIX and Linux operating systems?
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HowTo: UNIX / Linux Open TCP / UDP Ports

How do I open the TCP or UDP ports under UNIX / Linux like operating systems?
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UNIX Disk Usage Command Examples

How do I find out disk usage under UNIX operating systems using GUI, CLI and Perl / shell programs?
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