/proc/asound/version find alsa version
/proc/cpuinfo. Getting CPU information, such as the family, type, and speed
/proc/net Viewing important networking information under
/proc/net/dev, such as active interfaces information
/proc/net/route routing information
/proc/net/netstat network statistics.
/proc/kmsg Contains messages generated by the kernel
/proc/loadavg Lists the system load average
/proc/meminfo Displays memory usage
/proc/modules Lists the kernel modules currently loaded
/proc/mounts Shows all mounted file systems in Linux
/proc/net Lists status information about network protocols
/proc/stat
Contains system operating statistics, such as page fault occurrences,other statistics such as CPU load, swap file usage
/proc/uptime Displays the time the system has been up
/proc/version Displays the kernel version
Retrieving file system information.
/proc/interrupts Displays the interrupts in use
/proc/ioports Shows the I/O ports in use
/proc/num
Each process is held in a directory that’s labeled by its number: /proc/1 is the directory for process 1, for example
/proc/devices
Lists the device drivers configured for the currently running kernel
/proc/dma
Displays the Direct Memory Access (DMA) channels currently used
/proc/filesystems
Lists file systems configured into the kernel
proc/kcore
Holds an image of the physical memory of the system
/proc/net/arp
when a linux system (or any device with ethernet) wishes to address an IP address, the ARP request message "who is X.X.X.X tell Y.Y.Y.Y" is sent using the ethernet broadcast address. the target system forms an arp response "X.X.X.X" is hh:hh:hh:hh:hh:hh and sends it to the requesting host.An arp response is cached for a short time in /proc/net/arp to avoid the need to continually reestablish the mapping between hardware ethernet addresses and IP addresses.
/proc/sys/net/core/netdev_max_backlog
When the kernel receives packets from the places them on a special queue.By default, a maximum of 300 packets is allowed on the queue. Under extraordinary circumstances,you may need to edit this file and change the value for the allowed maximum.
/proc/sys/net/ipv4/icmp_echo_ignore_all
Default = 0, meaning that the kernel will respond to Internet Control Message Protocol ICMP) echo-reply messages. Set this to 1 to tell the kernel to stop replying to those messages.
/proc/sys/net/ipv4/icmp_echo_ignore_broadcasts
Default = 0, meaning that the kernel will allow ICMP responses to be sent to broadcast or multicast addresses.
/proc/sys/net/ipv4/ip_forward
Default = 0, meaning the kernel will not forward packets between network interfaces.To allow forwarding (e.g., for routing), change this to 1.
/proc/sys/net/ipv4/ip_local_port_range
Range of ports Linux will use when originating a connection. Default = 32768–61000.
/proc/sys/net/ipv4/tcp_syn_cookies
Default = 0 (Off). Change to 1 (On) to enable protection for the system against SYN flood attacks.
Reporting media mount point information via USB; for example, the Linux kernel reports what device to use to access files (such as /dev/sda) if a USB camera or hard drive is detected on the system. You can use the dmesg command to see this information.
See http://procps.sourceforge.net/faq.html
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