lsof: lsof: Lsof is a Unix-specific tool. Its name stands for "LiSt Open Files", lsof: and it does just that. It lists information about files that are open lsof: by the processes running on the system. lsof: lsof: Victor A. Abell of Purdue University is the developer of lsof. lsof: lsof: lsof: lsof: