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Critical system files in Linux
Posted on June 2nd, 2008 No commentsIn Linux, almost all configuration parameters are stored in ordinary text files. And there is a special location under which the configuration files are stored namely
/etc. The following table lists all major configuration files found in Linux and their purpose.Critical system files in Linux File/Directory Permissions Description /var/log/ 751 Directory containing all log files. /var/log/messages 644 System messages. /etc/crontab 600 System wide crontab file. /etc/syslog.conf 640 Syslog daemon configuration file. /etc/logrotate.conf 640 Controls rotation of system log files. /var/log/wtmp 660 Who is logged in now. Use who to view. /var/log/lastlog 640 Who has logged in before. Use last to view. /etc/ftpusers 600 List of users who cannot FTP to the machine. /etc/passwd 644 List of system’s user accounts. /etc/shadow 600 Contains encrypted account passwords. /etc/pam.d 750 PAM configuration files. /etc/hosts.allow 600 Access control file. /etc/hosts.deny 600 Access control file. /boot/grub/grub.conf 600 Boot configuration file for GRUB bootloader. /etc/securetty 600 TTY interfaces that allow root logins. /etc/shutdown.allow 400 Users allowed to ctrl-alt-del /etc/security 700 System access security policy files. /etc/rc.d/init.d/ 750 Program startup files on Red Hat systems. /etc/init.d/ 750 Program startup files on Debian systems. /etc/sysconfig 751 System and network config files on Red Hat. /etc/ssh 750 Secure shell configuration files. /etc/sysctl.conf 400 Contains kernel tunable options. Related Posts
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