Linux下查看系统的位数和系统信息

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）getconfLONG_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。

$getconfPAGE_SIZE

4096

$getconfINT_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_PATHValueforthePATHenvironmentvariableusedtofindcommands.

ARG_MAXMaximumlength,inbytes,oftheargumentsforoneoftheexecsubroutines,includingenvironmentdata.

BC_BASE_MAXMaximumvalueallowedfortheobasevariablewiththebccommand.

BC_DIM_MAXMaximumnumberofelementspermittedinanarraybythebccommand.

BC_SCALE_MAXMaximumvalueallowedforthescalevariablewiththebccommand.

BC_STRING_MAXMaximumlengthofastringconstantacceptedbythebccommand.

CHARCLASS_NAME_MAXMaximumnumberofbytesinacharacterclassname.

CHAR_BITNumberofbitsinatypecharacter.

CHAR_MAXMaximumvalueofatypecharacter.

CHAR_MINMinimumvalueofatypecharacter.

CHILD_MAXMaximumnumberofsimultaneousprocessesforeachrealuserID.

CLK_TCKNumberofclocktickspersecondreturnedbythetimesubroutine.

COLL_WEIGHTS_MAXMaximumnumberofweightsthatcanbeassignedtoanentryintheLC_COLLATElocalestanzainalocale-definitionfile.

CS_PATHValueofthePATHenvironmentvariableusedtofindcommands.

EXPR_NEST_MAXMaximumnumberofexpressionsthatcanbenestedwithinparenthesesbytheexprcommand.

INT_MAXMaximumvalueofatypeint.

INT_MINMinimumvalueofatypeint.

LINE_MAXMaximumlength,inbytes,ofacommand'sinputline(eitherstandardinputoranotherfile)whentheutilityisdescribedasprocessingtextfiles.Thelengthincludesroomforthetrailingnew-linecharacter.

LONG_BITNumberofbitsinatypelongint.

LONG_MAXMaximumvalueofatypelongint.

LONG_MINMinimumvalueofatypelongint.

MB_LEN_MAXMaximumnumberofbytesinacharacterforanysupportedlocale.

NGROUPS_MAXMaximumnumberofsimultaneoussupplementarygroupIDsforeachprocess.

NL_ARGMAXMaximumvalueofdigitincallstotheprintfandscanfsubroutines.

NL_LANGMAXMaximumnumberofbytesinaLANGname.

NL_MSGMAXMaximummessagenumber.

NL_NMAXMaximumnumberofbytesinanN-to-1collationmapping.

NL_SETMAXMaximumsetnumber.

NL_TEXTMAXMaximumnumberofbytesinamessagestring.

NZERODefaultprocesspriority.

OPEN_MAXMaximumnumberoffilesthatoneprocesscanhaveopenatonetime.

PATHSequenceofcolon-separatedpathprefixesusedtofindcommands.

RE_DUP_MAXMaximumnumberofrepeatedoccurrencesofaregularexpressionpermittedwhenusingtheinterval-notationparameters,suchasthemandnparameterswiththeedcommand.

SCHAR_MAXMaximumvalueofatypesignedchar.

SCHAR_MINMinimumvalueofatypesignedchar.

SHRT_MAXMaximumvalueofatypeshort.

SHRT_MINMinimumvalueofatypeshort.

SSIZE_MAXMaximumvalueofanobjectoftypessize_t.

STREAM_MAXNumberofstreamsthatoneprocesscanhaveopenatonetime.

TMP_MAXMinimumnumberofuniquepathnamesgeneratedbythetmpnamsubroutine.Maximumnumberoftimesanapplicationcanreliablycallthetmpnamsubroutine.

TZNAME_MAXMaximumnumberofbytessupportedforthenameofatimezone(notthelengthoftheTZenvironmentvariable).

UCHAR_MAXMaximumvalueofatypeunsignedchar.

UINT_MAXMaximumvalueofatypeunsignedint.

ULONG_MAXMaximumvalueofatypeunsignedlongint.

USHRT_MAXMaximumvalueofatypeunsignedshortint.

WORD_BITNumberofbitsinawordortypeint