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getconf命令【一天一個命令】

系統 2027 0

我們時常需要查詢系統相關的信息,比如頁面大小,整數大小之類,如果編寫程序去計算會比較繁瑣,這里有一個很有用的命令,可以用來獲取系統相關信息。它就是getconf。

?
$ getconf PAGE_SIZE
4096
$ getconf INT_MAX
2147483647
?

查看Ubuntu操作系統位數

From http://wiki.ubuntu.org.cn/UbuntuSkills#.E6.9F.A5.E7.9C.8B.E7.B3.BB.E7.BB.9F.E6.98.AF32.E4.BD.8D.E8.BF.98.E6.98.AF64.E4.BD.8D

查看系統是32位還是64位

        
          方法1:
        
      
        
          #查看long的位數,返回32或64


          
            getconf LONG_BIT
          
        
      
      
        
          方法2:

#查看文件信息,包含32-bit就是32位,包含64-bit就是64位

file /sbin/init
        
      
?
可以取得的相關信息如下(參考相關資料,在又在版本上會有些不同):

?

_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

getconf命令【一天一個命令】


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