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  2. Process identifier - Wikipedia

    en.wikipedia.org/wiki/Process_identifier

    On some systems, like MPE/iX, the lowest available PID is used, sometimes in an effort to minimize the number of process information kernel pages in memory. The current process ID is provided by a getpid() system call, [8] or as a variable $$ in shell. The process ID of a parent process is obtainable by a getppid() system call. [9]

  3. List of POSIX commands - Wikipedia

    en.wikipedia.org/wiki/List_of_POSIX_commands

    date: Misc Mandatory Display the date and time Version 1 AT&T UNIX dd: Filesystem Mandatory Convert and copy a file Version 5 AT&T UNIX delta: SCCS Optional (XSI) Make a delta (change) to an SCCS file PWB UNIX df: Filesystem Mandatory Report free disk space Version 1 AT&T UNIX diff: Text processing Mandatory Compare two files; see also cmp

  4. OBD-II PIDs - Wikipedia

    en.wikipedia.org/wiki/OBD-II_PIDs

    PID code (e.g.: 4980h) value of the specified parameter, byte 0 value, byte 1 (optional) value, byte 2 (optional) value, byte 3 (optional) Vehicle specific 7E8h, or 8h + physical ID of module. Number of additional data bytes: 3 7Fh this a general response usually indicating the module doesn't recognize the request.

  5. exec (system call) - Wikipedia

    en.wikipedia.org/wiki/Exec_(system_call)

    The argv value is an array of pointers to arguments. arg0. The first argument arg0 should be the name of the executable file. Usually it is the same value as the path argument. Some programs may incorrectly rely on this argument providing the location of the executable, but there is no guarantee of this nor is it standardized across platforms.

  6. Parent process - Wikipedia

    en.wikipedia.org/wiki/Parent_process

    After Linux kernel 3.4 this is no longer true, in fact processes can issue the prctl() system call with the PR_SET_CHILD_SUBREAPER option, and as a result they, not process #1, will become the parent of any of their orphaned descendant processes. This is the way of working of modern service managers and daemon supervision utilities including ...

  7. Unix shell - Wikipedia

    en.wikipedia.org/wiki/Unix_shell

    tcsh and sh shell windows on a Mac OS X Leopard [1] desktop. A Unix shell is a command-line interpreter or shell that provides a command line user interface for Unix-like operating systems. The shell is both an interactive command language and a scripting language, and is used by the operating system to control the execution of the system using ...

  8. Comparison of command shells - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_command_shells

    A shell script (or job) can report progress of long running tasks to the interactive user. Unix/Linux systems may offer other tools support using progress indicators from scripts or as standalone-commands, such as the program "pv". [49] These are not integrated features of the shells, however.

  9. Program-specific information - Wikipedia

    en.wikipedia.org/wiki/Program-specific_information

    Each of the programs listed in PAT has an associated value of PID for its PMT. The value 0x0000 for program_number is reserved to specify the PID where to look for network information table. If such a program is not present in PAT the default PID value (0x0010) shall be used for NIT. TS packets containing PAT information always have PID 0x0000.