If you are trying to find a program, log into the shell.

Type the command:

# whereis

where 'program' is the program you are looking for, will show you one or more possibilities for what you are looking for.

If you have more than one copy of a program, say one in /usr/bin and another in /usr/local/bin/ ,

typing "which program" will show you which one will be called first.

If you can't find it at all, type command:

# locate

will show you everyfile that matches "program".

Some of the most common programs :
• /usr/sbin/sendmail
• /usr/bin/perl
• /bin/mail
• /usr/bin/php

Default locations for most commonly used configuration files and important directories:

Exim

• /etc/exim.conf
• /var/log/exim_mainlog
• /var/log/exim_rejectlog
• /etc/valiases/
• /etc/vfilters/
• /home/username/.forward

MySQL

• /root/.my.cnf
• /etc/my.cnf
• /var/lib/mysql/

Apache
• /usr/local/apache/conf/httpd.conf
• /usr/local/apache/domlogs/

System
• /var/log/messages
• /var/log/dmesg

Proftpd
• /etc/proftpd.conf
• /var/log/xferlog
• /etc/proftpd/

sshd
• /etc/ssh/sshd_config