Linux Important System Files

File Purpose Where to Find More Information
User and Security Files
/etc/group User group information group, chmod
/etc/npasswd npasswd configuration file npasswd
/etc/shadow shadow password file password, npasswd
/etc/passwd User account information password, chmod
Networking Files
/etc/bootptab Internet Bootstrap Protocol server database bootptab
/etc/exports Directories to export to NFS clients exports
/etc/gateways List of gateways routed
/etc/hosts Hostname to IP address mapping file route
/etc/hosts.equiv Lists of trusted hosts and remote users hosts.equiv
/etc/inetd.conf inetd configuration file inetd
/etc/named.conf named default initialization file named
/etc/networks Known networks route
/usr/lib/named or/etc/named.d named configuration files named
/etc/smb.conf or /etc/samba/smb.conf SAMBA configuration file smb.conf
/etc/snmpd.conf SNMP daemon configuration file snmpd.conf
/etc/ftpaccess FTP configuration file ftpaccess
/etc/httpd/access.conf HTTP access configuration file
/etc/httpd/httpd.conf HTTP daemon configuration file
/etc/httpd/srm.conf HTTP server resource management configuration file
/etc/services Network services list services(5)
X-Windows Files
/etc/XF86Config or /etc/X11/XF86Config X-Server configuration file XF86Config, xf86config
/etc/X11/xinit/xinitrc xinit configuration file xinit
$HOME/.xinitrc User-specific xinit configuration file xinit
$HOME/.fvwmrc fvwm configuration file fvwm, X
/usr/lib/X11/system.fvwmrc System default MWM configuration file fvwm, X
/usr/lib/X11/app-defaults Application-specific defaults X
$HOME/.Xdefaults-hostname Host-specific defaults X
System Start-Up Files
/etc/inittab init configuration file inittab
/etc/lilo.conf Lilo configuration file lilo.conf, lilo
/etc/rc* System start-up scripts init, initscript
System Log Files
/etc/syslog.conf System login configuration file syslog.conf
/var/log/message General system log file syslogd
Miscellaneous Files
Systemwide shell configuration files man-page for respective shell
User-specifc shell configuration files man-page for respective shell
/etc/sysconfig Miscellaneous configuration files
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