getconf

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_CS_PATH              Value for the PATH environment variable used to find commands.
ARG_MAX               Maximum length, in bytes, of the arguments for one of the exec subroutines, including environment data. ARG_MAX 值 不能改, 要修改只能重新编译内核
BC_BASE_MAX           Maximum value allowed for the obase variable with the bc command.
BC_DIM_MAX            Maximum number of elements permitted in an array by the bc command.
BC_SCALE_MAX          Maximum value allowed for the scale variable with the bc command.
BC_STRING_MAX         Maximum length of a string constant accepted by the bc command.
CHARCLASS_NAME_MAX    Maximum number of bytes in a character class name.
CHAR_BIT    Number of bits in a type character.
CHAR_MAX    Maximum value of a type character.
CHAR_MIN    Minimum value of a type character.
CHILD_MAX    Maximum number of simultaneous processes for each real user ID.
CLK_TCK    Number of clock ticks per second returned by the time subroutine.
COLL_WEIGHTS_MAX    Maximum number of weights that can be assigned to an entry in the LC_COLLATE locale stanza in a locale-definition file.
CS_PATH    Value of the PATH environment variable used to find commands.
EXPR_NEST_MAX    Maximum number of expressions that can be nested within parentheses by the expr command.
INT_MAX    Maximum value of a type int.
INT_MIN    Minimum value of a type int.
LINE_MAX    Maximum length, in bytes, of a command's input line (either standard input or another file) when the utility is described as processing text files. The length includes room for the trailing new-line character.
LONG_BIT    Number of bits in a type long int.
LONG_MAX    Maximum value of a type long int.
LONG_MIN    Minimum value of a type long int.
MB_LEN_MAX    Maximum number of bytes in a character for any supported locale.
NGROUPS_MAX    Maximum number of simultaneous supplementary group IDs for each process.
NL_ARGMAX    Maximum value of digit in calls to the printf and scanf subroutines.
NL_LANGMAX    Maximum number of bytes in a LANG name.
NL_MSGMAX    Maximum message number.
NL_NMAX    Maximum number of bytes in an N-to-1 collation mapping.
NL_SETMAX    Maximum set number.
NL_TEXTMAX    Maximum number of bytes in a message string.
NZERO    Default process priority.
OPEN_MAX    Maximum number of files that one process can have open at one time.
PATH    Sequence of colon-separated path prefixes used to find commands.
RE_DUP_MAX    Maximum number of repeated occurrences of a regular expression permitted when using the interval-notation parameters, such as the m and n parameters with the ed command.
SCHAR_MAX    Maximum value of a type signed char.
SCHAR_MIN    Minimum value of a type signed char.
SHRT_MAX    Maximum value of a type short.
SHRT_MIN    Minimum value of a type short.
SSIZE_MAX    Maximum value of an object of type ssize_t.
STREAM_MAX    Number of streams that one process can have open at one time.
TMP_MAX    Minimum number of unique path names generated by the tmpnam subroutine. Maximum number of times an application can reliably call the tmpnam subroutine.
TZNAME_MAX    Maximum number of bytes supported for the name of a time zone (not the length of the TZ environment variable).
UCHAR_MAX    Maximum value of a type unsigned char.
UINT_MAX    Maximum value of a type unsigned int.
ULONG_MAX    Maximum value of a type unsigned long int.
USHRT_MAX    Maximum value of a type unsigned short int.
WORD_BIT    Number of bits in a word or type int