df
df is a Linux command in the System Info category, rated intermediate difficulty. Reports disk space usage for mounted filesystems. The syntax is df [options] [filesystem]. Key options and parameters: filesystem — specific mount point (optional). It returns disk usage information. A practical example: df -h # Human-readable sizes (GB/MB) df -T # Show filesystem type df -i # Show inode usage instead of blocks A close relative is uname, which displays system information (kernel name, hostname, architecture). A close relative is du, which estimates file and directory space usage. A close relative is free, which displays memory usage (RAM + swap). More about this category: Linux system info commands — uname, df, du, free, uptime, lscpu, and more. View system information and hardware details. Related System Info commands: uname, du, free, uptime, lscpu, lsusb, lspci, hostname. This page is part of the free Linux Reference documentation covering 304+ commands, each with syntax, options, practical examples, and a difficulty rating.