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Missing command fuser

Issue:

opatchauto apply is failing with below errors:

    Prerequisite check “CheckSystemCommandAvailable” failed.
    The details are: Missing command :fuser

Solution:

Install below package as a root user:

    yum install psmisc

The package contains the following programs:

    fuser - identifies what processes are using files.
    killall - kills a process by its name, similar to a pkill found in some other Unices.
    pstree - Shows currently running processes in a tree format.
    peekfd - Peek at file descriptors of running processes.