The Red Hat Linux file system is the backbone of the operating environment, housing everything from system configuration to user data and application files. Understanding its structure — and knowing how to move through it efficiently — is a fundamental skill for any Red Hat system administrator.
This guide walks you through the most important directories, frequently used system files, and the commands you’ll need to navigate, assess, and gather information about the file system. Whether you’re brushing up for an exam, sharpening your on-the-job skills, or preparing for a troubleshooting session, reviewing and practicing these commands will strengthen your Linux proficiency and problem-solving speed.
We recommend reading each section carefully and practicing the commands in a safe test environment. Consistent review will ensure you can locate critical files, analyze system information, and maintain your Red Hat systems with confidence.
Common Red Hat Directories
The Linux file system is structured hierarchically, with specific directories serving specific purposes. Below are the most critical directories you’ll encounter in Red Hat Enterprise Linux (RHEL) systems:
- /var – Stores variable data such as logs, spool files, and cache.
- /etc – Contains System configuration files.
- /tmp – Temporary files used by the system and applications.
- /opt – Optional add-on application software packages.
- /home – User home directories.
- /root – The root user’s home directory.
- /bin and /sbin – Essential binaries for all users and superuser.
- /sys – Hardware and device information allowing for kernel configuration.
- /proc – Information about running processes and other kernel information.
- /mnt – Generic mount point which to mount filesystems or devices.
- /run – Temporary file system (tmpfs) used for volatile runtime data since boot.
- /dev – Location to house special or device files.
Common Red Hat System Files
Certain files containing critical system and hardware information that is regularly referenced by administrators to include:
- /var/log/messages – Primary system log containing general operational messages. Heavily utilized when troubleshooting various issues.
- /var/log/secure – Critical security log that records security-related events primarily focused on authentication and authorization attempts.
- /var/log/audit/audit.log – Default log for the auditd daemon containing a comprehensive record of security-relevant events and system activity.,
- /etc/redhat-release – Displays the Red Hat Enterprise Linux version.
- /proc/meminfo – Reports detailed memory usage statistics.
- /proc/cpuinfo – Shows processor architecture and specifications.
- /etc/fstab – Lists file systems and their mount points for automatic exporting.
- /etc/exports – Network File System (NFS) server configuration file of local file systems (directories) that are exported to NFS Clients.
Commands for Navigating the File System
Efficient navigation is essential for any administrator. Below are commands you’ll use daily:
- ls – List directory contents with details.
- cd – Change the current working directory.
- pwd – Print the current working directory path.
- echo – Display text or variable values. Also useful for pushing text to files.
Commands for Listing File System Hardware and Details
Disk space management is vital for system health. These commands help assess usage:
- du – Estimate disk space used by files and directories.
- df – Display the file system disk space usage.
Commands for Listing File System Hardware and Details
When diagnosing issues or gathering system specs, these commands are invaluable:
- dmidecode – Display hardware details from BIOS/firmware.
- lsblk – List block devices and mount points.
- lspci – Show PCI device information.
- lsmod – Display loaded kernel modules
Practice and Review
To truly master the Red Hat file system, you should:
- Explore each directory and note its contents.
- Open each file listed in this lesson and observe its contents.
- Run each command, examine its output, and review the man page for additional information.
Regular review and hands-on practice will ensure you can locate information quickly, troubleshoot effectively, and maintain system stability under pressure.
