Linux important configuration files

/etc/sysconfig Directory on Red Hat Linux that holds system configuration files
/etc/rc.d Directory that holds system startup and shutdown files
/etc/rc.d/rc.sysinit Initialization file for the system
/etc/rc.config Configuration file for SuSE Linux system
/etc/rc.d/rc.local Initialization file for custom commands
/etc/rc.d/rc.modules Loads kernel modules on startup of the system
/etc/rc.d/init.d Directory that holds many of the daemons, servers and scripts for the System V init startup control standard
/sbin/init.d Directory that holds many of the daemons, servers, and scripts for a SuSE system
/etc/rc.d/rc(1-8).d Directories for the different runlevels; these directories hold links to scripts in the /etc/rc.d/init.d directory (on SuSE these are located in /sbin/init.d/rc(1-8).d
/etc/rc.d/init.d/halt Operations performed each time the system is shut down. Some distributions use the name rc.halt
/etc/rc.d/init.d/lpd Start up and shut down the lpd printing daemon
/etc/rc.d/init.d/inet Operations to start and stop the inetd Internet services daemon
/etc/rc.d/init.d/network Operations to start and stop the network connections
/etc/rc.d/init.d/httpd Operations to start and stop the httpd Web server daemon
/etc/X11 X Windows configuration files
/etc/lilo.conf LILO configuration file
/etc/fstab Listing of the Linux file systems and automatically mount file systems
/etc/hosts Hosts configuration file
/mnt Holds removable media file systems mount points
/etc/inittab The default state and terminal connections
/etc/passwd Contains user password and login information
/etc/shadow Contains user-encrypted passwords
/etc/group Contains a list of groups and the configuration for each group
/etc/syslog.conf Contains the names and locations of system log files
/proc/ Contains hardware configurations of the system
/var/log/boot.log(.x) Show the completion of daemons and other system functions, (.x) shows there are several corresponding to system boots
/var/log/cron (.x) Show the weekly and daily cron jobs completed, (.x) shows there are several corresponding to system boots
/var/log/dmesg Contains hardware detected on boot up
/var/log/maillog (.x) Mail logs for system information, (.x) shows there are several corresponding to system boots
/var/log/secure (.x) RSA key generation log, (.x) shows there are several corresponding to system boots
/var/log/spooler (.x) Spooler generation log, (.x) shows there are several corresponding to system boots
/var/log/fax Directory of fax log files
/var/log/httpd Directory of httpd Web daemon log files
/var/log/news Directory of news daemon log files
/var/log/samba Directory of samba log files
/var/log/squid Directory of squid log files
/var/log/uucp Directory of uucp log files

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