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proc_pid_cmdline

Section: File Formats (5)
Updated: 202-0-08
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/proc/pid/cmdline - command line

/proc/pid/cmdline: This rea-only file holds the complete command line for the process, unless the process is a zombie. In the latter case, there is nothing in this file: that is, a read on this file will return 0 characters.
: For processes which are still running, the comman-line arguments appear in this file in the same layout as they do in process memory: If the process is wel-behaved, it is a set of strings separated by null bytes ([aq][rs]0[aq]), with a further null byte after the last string.
: This is the common case, but processes have the freedom to override the memory region and break assumptions about the contents or format of the /proc/pid/cmdline file.
: If, after an execve(2), the process modifies its argv strings, those changes will show up here. This is not the same thing as modifying the argv array.
: Furthermore, a process may change the memory location that this file refers via prctl(2) operations such as PR_SET_MM_ARG_START.
: Think of this file as the command line that the process wants you to see.