lsof - list open files

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The lsof command reveals similar information since it is also capable of linking open ports to services: 
lsof -i | grep 834



The lsof output describes:


    

  • the identification number of the process (PID) that has opened the file;
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  • the process group identification number (PGID) of the process (optional);
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  • the process identification number of the parent process (PPID) (optional);
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  • the command the process is executing;
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  • the owner of the process;
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  • for all files in use by the process, including the executing text file and the shared libraries it is using:
      

    • the file descriptor number of the file, if applicable;
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    • the file's access mode;
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    • the file's lock status;
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    • the file's device numbers;
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    • the file's inode number;
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    • the file's size or offset;
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    •

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