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Goals
- Identify some useful commands to get information
about a networked computer system
Logged in?
- Who's logged on? (w or who or finger
on Unix/Linux)
- What processes are running (ps -aux or ps -elf
on Unix/Linux; use the process manager in Windows)
- What usernames are there? (/etc/passwd on Unix/Linux,
try the Computer Management / Users in Windows)
- What software is available? (ls various system directories
on Unix/Linux; rpm -q -a with RedHat and other Linux;
Control Panel / Add/Remove Software in Windows)
Not logged in?
- What ports are open? (use "telnet" to test by hand, e.g.,
telnet SERVERNAME 25 to see if an SMTP server is running)
- Is there a login banner or screen?
- A Web server?
- An organizational chart listing who does what with the system?
- Evidence on the Internet (sample: search groups.google.com to see whether
someone from the system has posted messages)
Remember, your activities might be logged! These
tests should be used with discretion.
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