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Pipelines
    A  pipeline is a sequence of one or more commands separated by one of the control operators | or |&.  The
    format for a pipeline is:

           [time [-p]] [ ! ] command [ [|⎪|&] command2 ... ]

    The standard output of command is connected  via  a  pipe  to  the  standard  input  of  command2.   This
    connection  is performed before any redirections specified by the command (see REDIRECTION below).  If |&
    is used, the standard error of command is connected to command2's standard input through the pipe; it  is
    shorthand  for  2>&1  |.   This  implicit  redirection  of  the  standard  error  is  performed after any
    redirections specified by the command.

    The return status of a pipeline is the exit status of the last command, unless  the  pipefail  option  is
    enabled.   If  pipefail  is  enabled,  the  pipeline's return status is the value of the last (rightmost)
    command to exit with a non-zero status, or zero if all commands exit successfully.  If the reserved  word
    !   precedes  a  pipeline, the exit status of that pipeline is the logical negation of the exit status as
    described above.  The shell waits for all commands in the pipeline to terminate before returning a value.

    If the time reserved word precedes a pipeline, the elapsed as well as user and system  time  consumed  by
    its execution are reported when the pipeline terminates.  The -p option changes the output format to that
    specified by POSIX.  When the shell is in posix mode, it does not recognize time as a  reserved  word  if
    the  next  token begins with a `-'.  The TIMEFORMAT variable may be set to a format string that specifies
    how the timing information should be displayed; see the description of TIMEFORMAT under  Shell  Variables
    below.

    When the shell is in posix mode, time may be followed by a newline.  In this case, the shell displays the
    total user and system time consumed by the shell and its children.  The TIMEFORMAT variable may  be  used
    to specify the format of the time information.

    Each command in a pipeline is executed as a separate process (i.e., in a subshell).

GNU project C and C++ compiler

-x language
    Specify explicitly the language for the following input files (rather than letting the compiler
    choose a default based on the file name suffix).  This option applies to all following input files
    until the next -x option.  Possible values for language are:

            c  c-header  cpp-output
            c++  c++-header  c++-cpp-output
            objective-c  objective-c-header  objective-c-cpp-output
            objective-c++ objective-c++-header objective-c++-cpp-output
            assembler  assembler-with-cpp
            ada
            f77  f77-cpp-input f95  f95-cpp-input
            go
            java

-c  Compile or assemble the source files, but do not link.  The linking stage simply is not done.  The
    ultimate output is in the form of an object file for each source file.

    By default, the object file name for a source file is made by replacing the suffix .c, .i, .s, etc.,
    with .o.

    Unrecognized input files, not requiring compilation or assembly, are ignored.

-E  Stop after the preprocessing stage; do not run the compiler proper.  The output is in the form of
    preprocessed source code, which is sent to the standard output.

    Input files which don't require preprocessing are ignored.

-v  Print (on standard error output) the commands executed to run the stages of compilation.  Also print
    the version number of the compiler driver program and of the preprocessor and the compiler proper.