How can I get file names of opened by a process?

By Posted on

Problem :

I want to list down all file names opened by init process. I know about /proc/PID/fd directory. But that gives file descriptors only. How can I get file names from list of file descriptors?

Solution :

Use lsof to list open files of a process, in your case “init”:

$ sudo lsof -ln -p `pgrep init`
COMMAND PID     USER   FD   TYPE DEVICE SIZE/OFF   NODE NAME
init      1        0  cwd    DIR    8,1     4096      2 /
init      1        0  rtd    DIR    8,1     4096      2 /
init      1        0  txt    REG    8,1    36992 354775 /sbin/init
init      1        0  mem    REG    8,1    14768 354922 /lib/x86_64-linux-gnu/libdl-2.13.so
init      1        0  mem    REG    8,1  1599504 350331 /lib/x86_64-linux-gnu/libc-2.13.so
init      1        0  mem    REG    8,1   126232 354818 /lib/x86_64-linux-gnu/libselinux.so.1
init      1        0  mem    REG    8,1   261184 354836 /lib/x86_64-linux-gnu/libsepol.so.1
init      1        0  mem    REG    8,1   136936 354986 /lib/x86_64-linux-gnu/ld-2.13.so
init      1        0   10u  FIFO   0,14      0t0   3054 /run/initctl