灵活使用getconf命令来获取系统信息

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                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_SIZE4096$ getconf INT_MAX2147483647
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

               
               
               

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