getconf command "One day, one command"

We often need to query system-related information, such as page size, integer size, and so on, if the program to calculate will be more cumbersome, there is a very useful command, can be used to obtain information about the system. It is getconf.

$ getconf page_size4096$ getconf Int_max2147483647view Ubuntu operating system number of digits

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

See if the system is 32-bit or 64-bit

Method 1:

#查看long的位数, return 32 orgetconf long_bit

Method 2: #查看文件信息, including 32-bit is 32 bits, including 64-bit is 64-bit File/sbin/init

The relevant information can be obtained as follows (refer to the relevant information, in another version will be somewhat different):

_cs_path	Value for the PATH environment variable used to find commands.
Arg_max	Maximum length, in bytes, the 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 a 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 is 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 is 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 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 has 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 has 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 command "One day, one command"