Linux下查看系统的位数和系统信息

新苗1974

对于linux系统，，安装一些软件，，有时候要考虑到linux系统是32位还是64位的系统
可以通过终端输入命令：
1）getconf LONG_BIT可以得到系统的具体位数是32还是64位。
2) uname -a 可得到系统的具体系统

我们时常需要查询系统相关的信息，比如页面大小，整数大小之类，如果编写程序去计算会比较繁琐，这里有一个很有用的命令，可以用来获取系统相关信息。它就是getconf。

$ getconf PAGE_SIZE
4096
$ getconf INT_MAX
2147483647

可以取得的相关信息如下(参考相关资料，在又在版本上会有些不同）：
_CS_PATHValue for the PATH environment variable used to find commands.
ARG_MAXMaximum length, in bytes, of the arguments for one of the exec subroutines, including environment data.
BC_BASE_MAXMaximum value allowed for the obase variable with the bc command.
BC_DIM_MAXMaximum number of elements permitted in an array by the bc command.
BC_SCALE_MAXMaximum value allowed for the scale variable with the bc command.
BC_STRING_MAXMaximum length of a string constant accepted by the bc command.
CHARCLASS_NAME_MAXMaximum number of bytes in a character class name.
CHAR_BITNumber of bits in a type character.
CHAR_MAXMaximum value of a type character.
CHAR_MINMinimum value of a type character.
CHILD_MAXMaximum number of simultaneous processes for each real user ID.
CLK_TCKNumber of clock ticks per second returned by the time subroutine.
COLL_WEIGHTS_MAXMaximum number of weights that can be assigned to an entry in the LC_COLLATE locale stanza in a locale-definition file.
CS_PATHValue of the PATH environment variable used to find commands.
EXPR_NEST_MAXMaximum number of expressions that can be nested within parentheses by the expr command.
INT_MAXMaximum value of a type int.
INT_MINMinimum value of a type int.
LINE_MAXMaximum 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_BITNumber of bits in a type long int.
LONG_MAXMaximum value of a type long int.
LONG_MINMinimum value of a type long int.
MB_LEN_MAXMaximum number of bytes in a character for any supported locale.
NGROUPS_MAXMaximum number of simultaneous supplementary group IDs for each process.
NL_ARGMAXMaximum value of digit in calls to the printf and scanf subroutines.
NL_LANGMAXMaximum number of bytes in a LANG name.
NL_MSGMAXMaximum message number.
NL_NMAXMaximum number of bytes in an N-to-1 collation mapping.
NL_SETMAXMaximum set number.
NL_TEXTMAXMaximum number of bytes in a message string.
NZERODefault process priority.
OPEN_MAXMaximum number of files that one process can have open at one time.
PATHSequence of colon-separated path prefixes used to find commands.
RE_DUP_MAXMaximum 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_MAXMaximum value of a type signed char.
SCHAR_MINMinimum value of a type signed char.
SHRT_MAXMaximum value of a type short.
SHRT_MINMinimum value of a type short.
SSIZE_MAXMaximum value of an object of type ssize_t.
STREAM_MAXNumber of streams that one process can have open at one time.
TMP_MAXMinimum number of unique path names generated by the tmpnam subroutine. Maximum number of times an application can reliably call the tmpnam subroutine.
TZNAME_MAXMaximum number of bytes supported for the name of a time zone (not the length of the TZ environment variable).
UCHAR_MAXMaximum value of a type unsigned char.
UINT_MAXMaximum value of a type unsigned int.
ULONG_MAXMaximum value of a type unsigned long int.
USHRT_MAXMaximum value of a type unsigned short int.
WORD_BITNumber of bits in a word or type int