我們時(shí)常需要查詢系統(tǒng)相關(guān)的信息，比如頁面大小，整數(shù)大小之類，如果編寫程序去計(jì)算會(huì)比較繁瑣，這里有一個(gè)很有用的命令，可以用來獲取系統(tǒng)相關(guān)信息。它就是getconf。
?
$ getconf PAGE_SIZE
4096
$ getconf INT_MAX
2147483647
?
?
可以取得的相關(guān)信息如下(參考相關(guān)資料，在又在版本上會(huì)有些不同）：
?
| _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. |
| 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
|
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