How do I get the path of a process in Unix / Linux

You can find the exe easily by these ways, just try it yourself.

• ll /proc/<PID>/exe
• pwdx <PID>
• lsof -p <PID> | grep cwd

On Linux, the symlink /proc/<pid>/exe has the path of the executable. Use the command readlink -f /proc/<pid>/exe to get the value.

On AIX, this file does not exist. You could compare cksum <actual path to binary> and cksum /proc/<pid>/object/a.out.