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getconf(1)


getconf -- get configuration values

Synopsis

getconf system_var

getconf path_var pathname

Description

In the first synopsis form, the getconf utility will write to the standard output the value of the variable specified by the system_var operand.

In the second synopsis form, the getconf utility will write to the standard output the value of the variable specified by the path_var operand for the path specified by the pathname operand.

The value of each configuration variable will be determine as if it were obtained by calling the function from which it is defined to be available. The value will reflect conditions in the current operating environment.


path_var
is the name of a configuration variable whose value is available from pathconf function. The following values are supported (other local values):

LINK_MAN NAME_MAX POSIX_CHOWN_RESTRICTED
MAX_CANON PATH_MAX POSIX_NO_TRUNC
MAX_INPUT PIPE_BUF POSIX_VDISABLE

 LINK_MAN    NAME_MAX   POSIX_CHOWN_RESTRICTED
 MAX_CANON   PATH_MAX   POSIX_NO_TRUNC
 MAX_INPUT   PIPE_BUF   POSIX_VDISABLE

pathname
is the pathname for which the variable specified by path_var is to be determined.

system_var
is the name of a configuration variable whose value is available from the XSH specification confstr or sysconf functions. The following values are supported (other local values):

ARG_MAX ATEXIT_MAX BC_BASE_MAX
BC_DIM_MAX BC_SCALE_MAX BC_STRING_MAX
CHARCLASS_NAME_MAX CHAR_BIT CHAR_MAX
CHAR_MIN CHILD_MAX CLK_TCK
COLL_WEIGHTS_MAX CS_PATH EXPR_NEST_MAX
INT_MAX INT_MIN IOV_MAX
LINE_MAX LONG_BIT LONG_MAX
LONG_MIN MB_LEN_MAX MN_NMAX
NGROUPS_MAX NL_ARGMAX NL_LANGMAX
NL_MSGMAX NL_SETMAX NL_TEXTMAX
NZERO OPEN_MAX PAGESIZE
POSIX2_BC_BASE_MAX POSIX2_BC_DIM_MAX POSIX2_BC_SCALE_MAX
POSIX2_BC_STRING_MAX POSIX2_BIND POSIX2_CHAR_TERM
POSIX2_COLL_WEIGHTS_MAX POSIX2_C_DEV POSIX2_C_VERSION
POSIX2_EXPR_NEST_MAX POSIX2_FORT_DEV POSIX2_FORT_RUN
POSIX2_LINE_MAX POSIX2_LOCALEDEF POSIX2_RE_DUP_MAX
POSIX2_SW_DEV POSIX2_UPE POSIX2_VERSION
POSIX_ARG_MAX POSIX_CHILD_MAX POSIX_JOB_CONTROL
POSIX_LINK_MAX POSIX_MAX_CANON POSIX_MAX_INPUT
POSIX_NAME_MAX POSIX_NGROUPS_MAX POSIX_OPEN_MAX
POSIX_PATH_MAX POSIX_PIPE_BUF POSIX_SAVED_IDS
POSIX_SSIZE_MAX POSIX_STREAM_MAX POSIX_TZNAME_MAX
POSIX_VERSION RE_DUP_MAX SCHAR_MAX
SCHAR_MIN SHRT_MAX SHRT_MIN
SSIZE_MAX STREAM_MAX TMP_MAX
TZNAME_MAX UCHAR_MAX UINT_MAX
ULONG_MAX USHRT_MAX WORD_BIT
_XOPEN_CRYPT _XOPEN_ENH_I18N _XOPEN_SHM
_XOPEN_UNIX _XOPEN_VERSION _XOPEN_XCU_VERSION
_XOPEN_XPG2 _XOPEN_XPG3 _XOPEN_XPG4

 ARG_MAX                   ATEXIT_MAX          BC_BASE_MAX
 BC_DIM_MAX                BC_SCALE_MAX        BC_STRING_MAX
 CHARCLASS_NAME_MAX        CHAR_BIT            CHAR_MAX
 CHAR_MIN                  CHILD_MAX           CLK_TCK
 COLL_WEIGHTS_MAX          CS_PATH             EXPR_NEST_MAX
 INT_MAX                   INT_MIN             IOV_MAX
 LINE_MAX                  LONG_BIT            LONG_MAX
 LONG_MIN                  MB_LEN_MAX          MN_NMAX
 NGROUPS_MAX               NL_ARGMAX           NL_LANGMAX
 NL_MSGMAX                 NL_SETMAX           NL_TEXTMAX
 NZERO                     OPEN_MAX            PAGESIZE
 POSIX2_BC_BASE_MAX        POSIX2_BC_DIM_MAX   POSIX2_BC_SCALE_MAX
 POSIX2_BC_STRING_MAX      POSIX2_BIND         POSIX2_CHAR_TERM
 POSIX2_COLL_WEIGHTS_MAX   POSIX2_C_DEV        POSIX2_C_VERSION
 POSIX2_EXPR_NEST_MAX      POSIX2_FORT_DEV     POSIX2_FORT_RUN
 POSIX2_LINE_MAX           POSIX2_LOCALEDEF    POSIX2_RE_DUP_MAX
 POSIX2_SW_DEV             POSIX2_UPE          POSIX2_VERSION
 POSIX_ARG_MAX             POSIX_CHILD_MAX     POSIX_JOB_CONTROL
 POSIX_LINK_MAX            POSIX_MAX_CANON     POSIX_MAX_INPUT
 POSIX_NAME_MAX            POSIX_NGROUPS_MAX   POSIX_OPEN_MAX
 POSIX_PATH_MAX            POSIX_PIPE_BUF      POSIX_SAVED_IDS
 POSIX_SSIZE_MAX           POSIX_STREAM_MAX    POSIX_TZNAME_MAX
 POSIX_VERSION             RE_DUP_MAX          SCHAR_MAX
 SCHAR_MIN                 SHRT_MAX            SHRT_MIN
 SSIZE_MAX                 STREAM_MAX          TMP_MAX
 TZNAME_MAX                UCHAR_MAX           UINT_MAX
 ULONG_MAX                 USHRT_MAX           WORD_BIT
 _XOPEN_CRYPT              _XOPEN_ENH_I18N     _XOPEN_SHM
 _XOPEN_UNIX               _XOPEN_VERSION      _XOPEN_XCU_VERSION
 _XOPEN_XPG2               _XOPEN_XPG3         _XOPEN_XPG4

The symbol PATH also is recognized, yielding the same value as the confstr name value CS_PATH.

Environment variables


LANG
Provide a default value of the internationalization variables that are unset or null. If LANG is unset or null, the corresponding value from the implementation-specific default locale will be used. If any of the internationalization variables contains an invalid setting, the utility will behave as if none of the variables had been defined.

LC_ALL
If set to a non-empty string value, override the values of all the other internationalization variables.

LC_CTYPE
Determine the locale for the interpretation of sequences of bytes of text data as characters (for example, single- as opposed to multi-byte characters in arguments).

LC_MESSAGES
Determine the locale that should be used to affect the format and contents of diagnostic messages written to standard error.

NLSPATH
Determine the location of message catalogues for the processing of LC_MESSAGES.

Output

If the specified variable is defined on the system and its value is described to be available from the XSH specification confstr function, its value will be written in the following format:

"%s\n", <value>

Otherwise, if the specified variable is defined on the system, its value will be written in the following format:

"%d\n", <value>

If the specified variable is valid, but is undefined on the system, getconf will write using the following format:

"undefined\n"

If the variable name is invalid or an error occurs, nothing will be written to standard output.

Examples

This example illustrates the value of {NGROUPS_MAX}:

getconf NGROUPS_MAX

This example illustrates the value of {NAME_MAX} for a specific directory:

getcon NAME_MAX /usr

This example shows how to deal more carefully with results that might be unspecified:

   if value=$(getconf PATH_MAX /usr); then
          if ["$value" = "undefined"]; then
                echo PATH_MAX in /usr is infinite.
          else
                echo PATH_MAX in /usr is $value.
          fi
   else
          echo Error in getconf.
   fi

Note that:

   sysconf(_SC_POSIX_C_BIND);
and:
   system("getconf POSIX2_C_BIND");
in a C program could give different answers. The sysconf call supplies a value that corresponds to the conditions when the program was either compiled or executed, depending on the implementation; the system call to getconf always supplies a value corresponding to conditions when the program is executed.

References

confstr(3C), fpathconf(2), sysconf(3C)
© 2004 The SCO Group, Inc. All rights reserved.
UnixWare 7 Release 7.1.4 - 25 April 2004