Find out everything about a particular Linux process...
/proc/<pid>/<type>- eg. sudo cat
/proc/1234/environ
http://www.tldp.org/LDP/Linux-Filesystem-Hierarchy/html/proc.html
/proc/PID/cmdline- Command line arguments./proc/PID/cpu- Current and last cpu in which it was executed./proc/PID/cwd- Link to the current working directory./proc/PID/environ- Values of environment variables./proc/PID/exe- Link to the executable of this process./proc/PID/fd- Directory, which contains all file descriptors./proc/PID/maps- Memory maps to executables and library files./proc/PID/mem- Memory held by this process./proc/PID/root- Link to the root directory of this process./proc/PID/stat- Process status./proc/PID/statm- Process memory status information./proc/PID/status- Process status in human readable form.- etc