/proc/{pid}/ useful content

Based on [[John Fusco]] --

./cmdline is a text file ...
./cmd is a symlink to the current working dir of the process
./environ is a text file showing the process's env vars
./fd/ hold symlinks to the file descriptors, including sockets
./maps is a text file showing user space memory of the process
./smaps is a text file showing detailed info on shared lib used by the process
./status is a more human-readable text file with many process details