Useful commands to run against /proc

proc_cheat_sheet.sh

# Obtain the (IPv4) addresses for all network interfaces
awk '/32 host/ { print f } {f=$2}' <<< "$(</proc/net/fib_trie)"

# Get info about the CPU
cat /proc/cpuinfo

# List the available filesystems
cat /proc/filesystems

# See what filesystems are mounted
cat /proc/mounts

# See the environment variables a process has access to
cat /proc/$SOME_PROCESS_ID/environ

# See the command line arguments that were used to launch a program
cat /proc/$SOME_PROCESS_ID/cmdline

# See memory info for process
#
# Columns:
#   1. virtual memory addresses used
#   2. permissions for address access
#   3. offset into the mapping
#   4. device storing this file
#   5. inode on the device for this address space
#   6. pathname to the file associated with this address space
#
cat /proc/$SOME_PROCESS_ID/maps