GETCONF(1)                   General Commands Manual                  GETCONF(1)

     getconf – retrieve standard configuration variables

     getconf [-v environment] path_var file
     getconf [-v environment] system_var

     The getconf utility prints the value of a POSIX or X/Open path or system
     configuration variable to the standard output.  If the specified variable
     is undefined, the string “undefined” is output.

     The first form of the command, with two mandatory arguments, retrieves
     file- and file system-specific configuration variables using pathconf(2).
     The second form, with a single argument, retrieves system configuration
     variables using confstr(3) and sysconf(3), depending on the type of
     variable.  As an extension, the second form can also be used to query
     static limits from <limits.h>.

     All sysconf(3) and pathconf(2) variables use the same name as the manifest
     constants defined in the relevant standard C-language bindings, including
     any leading underscore or prefix.  That is to say, system_var might be
     ARG_MAX or _POSIX_VERSION, as opposed to the sysconf(3) names _SC_ARG_MAX
     or _SC_POSIX_VERSION.  Variables retrieved from confstr(3) have the leading
     ‘_CS_’ stripped off; thus, _CS_PATH is queried by a system_var of “PATH”.

   Programming Environments
     The -v environment option specifies a IEEE Std 1003.1-2001 (“POSIX.1”)
     programming environment under which the values are to be queried.  This
     option currently does nothing, but may in the future be used to select
     between 32-bit and 64-bit execution environments on platforms which support
     both.  Specifying an environment which is not supported on the current
     execution platform gives undefined results.

     The standard programming environments are as follows:

           POSIX_V6_ILP32_OFF32       Exactly 32-bit integer, long, pointer, and
                                      file offset.  Supported platforms: None.

           POSIX_V6_ILP32_OFFBIG      Exactly 32-bit integer, long, and pointer;
                                      at least 64-bit file offset.  Supported
                                      platforms: IA32, PowerPC.

           POSIX_V6_LP64_OFF64        Exactly 32-bit integer; exactly 64-bit
                                      long, pointer, and file offset.  Supported
                                      platforms: Alpha, SPARC64.

           POSIX_V6_LPBIG_OFFBIG      At least 32-bit integer; at least 64-bit
                                      long, pointer, and file offset.  Supported
                                      platforms: None.

     The command:


     returns a newline-separated list of environments in which the width of
     certain fundamental types is no greater than the width of the native C type
     long.  At present, all programming environments supported by FreeBSD have
     this property.  Several of the confstr(3) variables provide information on
     the necessary compiler and linker flags to use the standard programming
     environments described above.

     Many of these values are also available through the sysctl(8) mechanism.

     The getconf utility exits 0 on success, and >0 if an error occurs.

     The command:

           getconf PATH

     will display the system default setting for the PATH environment variable.

     The command:

           getconf NAME_MAX /tmp

     will display the maximum length of a filename in the /tmp directory.

     The command:

           getconf -v POSIX_V6_LPBIG_OFFBIG LONG_MAX

     will display the maximum value of the C type long in the
     POSIX_V6_LPBIG_OFFBIG programming environment, if the system supports that

     Use of a system_var or path_var which is completely unrecognized is
     considered an error, causing a diagnostic message to be written to standard
     error.  One which is known but merely undefined does not result in an error
     indication.  The getconf utility recognizes all of the variables defined
     for IEEE Std 1003.1-2001 (“POSIX.1”), including those which are not
     currently implemented.

     pathconf(2), confstr(3), sysconf(3), sysctl(8)

     The getconf utility is expected to be compliant with IEEE Std 1003.1-2001

     The getconf utility first appeared in FreeBSD 5.0.

     Garrett A. Wollman ⟨⟩

macOS 12.1                     September 18, 2002                     macOS 12.1