$ bat /proc/3151/cmdline
───────┬─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
       │ File: /proc/3151/cmdline   <BINARY>
───────┴─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
$ /bin/cat /proc/3151/cmdline;
sleep100%

PROC(5)                                                   Linux Programmer's Manual                                                   PROC(5)

NAME
       proc - process information pseudo-filesystem

DESCRIPTION
       The  proc  filesystem  is a pseudo-filesystem which provides an interface to kernel data structures.  It is commonly mounted at /proc.
       Typically, it is mounted automatically by the system, but it can also be mounted manually using a command such as:

           mount -t proc proc /proc

       Most of the files in the proc filesystem are read-only, but some files are writable, allowing kernel variables to be changed.