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/proc Linux filesystem

The /proc filesystem provides information regarding Linux processes, Linux kernel features, and Linux system hardware. The /proc filesystem is memory-based, not stored on the hard drive.

/proc/cmdline - The Linux kernel parameters that were used to boot the system.
/proc/cpuinfo - Information about the CPUs.
/proc/devices - A list of each character device file and block device file that the Linux kernel has recognized.
/proc/mdstat - Information about Linux RAID devices.
/proc/meminfo - Information about Linux system memory.
/proc/modules - A list of all Linux kernel modules currently loaded into Linux memory.
/proc/partitions - The Linux kernel’s partition table. Note: this may be different from what is in the hard disk’s partition table.
/proc/swaps - A list of all Linux swap space recognized by the Linux kernel.
/proc/vmstat - Linux virtual memory information.
/proc/sys - A directory that contains tunable Linux kernel parameters.