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.TH getconf 1 "2011 年 7 月 27 日" "SunOS 5.11" "用户命令"
.SH 名称
getconf \- 获取配置值
.SH 用法概要
.LP
.nf
\fB/usr/bin/getconf\fR [\fB-v\fR \fIspecification\fR] \fIsystem_var\fR
.fi
.LP
.nf
\fB/usr/bin/getconf\fR [\fB-v\fR \fIspecification\fR] \fIpath_var\fR \fIpathname\fR
.fi
.LP
.nf
\fB/usr/bin/getconf\fR \fB-a\fR
.fi
.LP
.nf
\fB/usr/xpg4/bin/getconf\fR [\fB-v\fR \fIspecification\fR] \fIsystem_var\fR
.fi
.LP
.nf
\fB/usr/xpg4/bin/getconf\fR [\fB-v\fR \fIspecification\fR] \fIpath_var\fR \fIpathname\fR
.fi
.LP
.nf
\fB/usr/xpg4/bin/getconf\fR \fB-a\fR
.fi
.LP
.nf
\fB/usr/xpg6/bin/getconf\fR [\fB-v\fR \fIspecification\fR] \fIsystem_var\fR
.fi
.LP
.nf
\fB/usr/xpg6/bin/getconf\fR [\fB-v\fR \fIspecification\fR] \fIpath_var\fR \fIpathname\fR
.fi
.LP
.nf
\fB/usr/xpg6/bin/getconf\fR \fB-a\fR
.fi
.SH 描述
.sp
.LP
在第一个用法概要形式中，\fBgetconf\fR 实用程序会将 \fIsystem_var\fR 指定的变量值写入标准输出，如果使用了 \fB-v\fR 选项，则与 \fIspecification\fR 一致。
.sp
.LP
在第二个用法概要形式中，\fBgetconf\fR 会为 \fIpathname\fR 指定的路径，将 \fIpath_var\fR 指定的变量值写入标准输出，如果使用了 \fB- v\fR 选项，则与 \fIspecification\fR 一致。
.sp
.LP
在第三个用法概要形式中，\fBconfig\fR 会将当前系统配置变量的名称写入标准输出。
.sp
.LP
确定每个配置变量的值时，会将其视为通过调用将其定义为可供使用的函数而获取。值反映当前操作环境中的条件。
.SH 选项
.sp
.LP
支持以下选项：
.sp
.ne 2
.mk
.na
\fB\fB-a\fR\fR
.ad
.RS 20n
.rt
将当前系统配置变量的名称写入标准输出。
.RE
.sp
.ne 2
.mk
.na
\fB\fB-v\fR \fIspecification\fR\fR
.ad
.RS 20n
.rt
给出可管理为配置变量选择值的规范。
.RE
.SH 操作数
.sp
.LP
支持下列操作数：
.sp
.ne 2
.mk
.na
\fB\fIpath_var\fR\fR
.ad
.RS 12n
.rt
配置变量的名称，其值可通过 \fBpathconf\fR(2) 函数获取。支持下表中的所有值：
.RE
.sp
.sp
.TS
tab();
lw(1.83i) lw(1.83i) lw(1.83i)
lw(1.83i) lw(1.83i) lw(1.83i)
.
LINK_MAXNAME_MAX_POSIX_CHOWN_RESTRICTED
MAX_CANONPATH_MAX_POSIX_NO_TRUNC
MAX_INPUTPIPE_BUF_POSIX_VDISABLE
.TE
.sp
.ne 2
.mk
.na
\fB\fIpathname\fR\fR
.ad
.RS 14n
.rt
路径名，将为其确定 \fIpath_var\fR 指定的变量。
.RE
.sp
.ne 2
.mk
.na
\fB\fIsystem_var\fR\fR
.ad
.RS 14n
.rt
配置变量的名称，其值可通过 \fBconfstr\fR(3C) 或 \fBsysconf\fR(3C) 获取。支持下表中的所有值：
.RE
.sp
.sp
.TS
tab();
lw(2.75i) lw(2.75i)
lw(2.75i) lw(2.75i)
.
ARG_MAXBC_BASE_MAX
BC_DIM_MAXBC_SCALE_MAX
BC_STRING_MAXCHAR_BIT
CHARCLASS_NAME_MAXCHAR_MAX
CHAR_MINCHILD_MAX
CLK_TCKCOLL_WEIGHTS_MAX
CS_PATHEXPR_NEST_MAX
HOST_NAME_MAXINT_MAX
INT_MINLFS64_CFLAGS
LFS64_LDFLAGSLFS64_LIBS
LFS64_LINTFLAGSLFS_CFLAGS
LFS_LDFLAGSLFS_LIBS
LFS_LINTFLAGSLINE_MAX
LONG_BITLONG_MAX
LONG_MINMB_LEN_MAX
NGROUPS_MAXNL_ARGMAX
NL_LANGMAXNL_MSGMAX
NL_NMAXNL_SETMAX
NL_TEXTMAXNZERO
OPEN_MAXPOSIX2_BC_BASE_MAX
POSIX2_BC_DIM_MAXPOSIX2_BC_SCALE_MAX
POSIX2_BC_STRING_MAXPOSIX2_C_BIND
POSIX2_C_DEVPOSIX2_CHAR_TERM
POSIX2_COLL_WEIGHTS_MAXPOSIX2_C_VERSION
POSIX2_EXPR_NEST_MAXPOSIX2_FORT_DEV
POSIX2_FORT_RUNPOSIX2_LINE_MAX
POSIX2_LOCALEDEFPOSIX2_RE_DUP_MAX
POSIX2_SW_DEVPOSIX2_SYMLINKS
POSIX2_UPEPOSIX2_VERSION
POSIX_ALLOC_SIZE_MINPOSIX_REC_INCR_XFER_SIZE
POSIX_REC_MAX_XFER_SIZEPOSIX_REC_MIN_XFER_SIZE
POSIX_REC_XFER_ALIGNPOSIX_V6_ILP32_OFF32
POSIX_V6_ILP32_OFF32_CFLAGSPOSIX_V6_ILP32_OFF32_LDFLAGS
POSIX_V6_ILP32_OFF32_LIBSPOSIX_V6_ILP32_OFFBIG
POSIX_V6_ILP32_OFFBIG_CFLAGSPOSIX_V6_ILP32_OFFBIG_LDFLAGS
POSIX_V6_ILP32_OFFBIG_LIBSPOSIX_V6_LP64_OFF64
POSIX_V6_LP64_OFF64_CFLAGSPOSIX_V6_LP64_OFF64_LDFLAGS
POSIX_V6_LP64_OFF64_LIBSPOSIX_V6_LPBIG_OFFBIG
POSIX_V6_LPBIG_OFFBIG_CFLAGSPOSIX_V6_LPBIG_OFFBIG_LDFLAGS
POSIX_V6_LPBIG_OFFBIG_LIBSPOSIX_V6_WIDTH_RESTRICTED_ENVS
SYMLINK_MAXSYMLOOP_MAX
_POSIX2_BC_BASE_MAX_POSIX2_BC_DIM_MAX
_POSIX2_BC_SCALE_MAX_POSIX2_BC_STRING_MAX
_POSIX2_CHARCLASS_NAME_MAX_POSIX2_CHAR_TERM
_POSIX2_COLL_WEIGHTS_MAX_POSIX2_C_BIND
_POSIX2_C_DEV_POSIX2_C_VERSION
_POSIX2_EXPR_NEST_MAX_POSIX2_FORT_DEV
_POSIX2_FORT_RUN_POSIX2_LINE_MAX
_POSIX2_LOCALEDEF_POSIX2_PBS
_POSIX2_PBS_ACCOUNTING_POSIX2_PBS_CHECKPOINT
_POSIX2_PBS_LOCATE_POSIX2_PBS_MESSAGE
_POSIX2_PBS_TRACK_POSIX2_RE_DUP_MAX
_POSIX2_SW_DEV_POSIX2_UPE
_POSIX2_VERSION_POSIX_ADVISORY_INFO
_POSIX_AIO_LISTIO_MAX_POSIX_AIO_MAX
_POSIX_ARG_MAX_POSIX_ASYNC_IO
_POSIX_BARRIERS_POSIX_CHILD_MAX
_POSIX_CLOCKRES_MIN_POSIX_CLOCK_SELECTION
_POSIX_CPUTIME_POSIX_DELAYTIMER_MAX
_POSIX_HOST_NAME_MAX_POSIX_IPV6
_POSIX_JOB_CONTROL_POSIX_LINK_MAX
_POSIX_LOGIN_NAME_MAX_POSIX_MAX_CANON
_POSIX_MAX_INPUT_POSIX_MONOTONIC_CLOCK
_POSIX_MQ_OPEN_MAX_POSIX_MQ_PRIO_MAX
_POSIX_NAME_MAX_POSIX_NGROUPS_MAX
_POSIX_OPEN_MAX_POSIX_PATH_MAX
_POSIX_PIPE_BUF_POSIX_PRIO_IO
_POSIX_RAW_SOCKETS_POSIX_READER_WRITER_LOCKS
_POSIX_REGEXP_POSIX_RE_DUP_MAX
_POSIX_RTSIG_MAX_POSIX_SAVED_IDS
_POSIX_SEM_NSEMS_MAX_POSIX_SEM_VALUE_MAX
_POSIX_SHELL_POSIX_SIGQUEUE_MAX
_POSIX_SPAWN_POSIX_SPIN_LOCKS
_POSIX_SPORADIC_SERVER_POSIX_SSIZE_MAX
_POSIX_SS_REPL_MAX_POSIX_STREAM_MAX
_POSIX_SYMLINK_MAX_POSIX_SYMLOOP_MAX
_POSIX_SYNC_IO_POSIX_THREAD_ATTR_STACKADDR
_POSIX_THREAD_ATTR_STACKSIZE_POSIX_THREAD_CPUTIME
_POSIX_THREAD_DESTRUCTOR_ITERATIONS_POSIX_THREAD_KEYS_MAX
_POSIX_THREAD_PRIORITY_SCHEDULING_POSIX_THREAD_PRIO_INHERIT
_POSIX_THREAD_PRIO_PROTECT_POSIX_THREAD_PROCESS_SHARED
_POSIX_THREAD_SAFE_FUNCTIONS_POSIX_THREAD_SPORADIC_SERVER
_POSIX_THREAD_THREADS_MAX_POSIX_TIMEOUTS
_POSIX_TIMER_MAX_POSIX_TRA_POSIX_TIMER_MAXCE
_POSIX_TIMESTAMP_RESOLUTION
_POSIX_TRACE_EVENT_FILTER_POSIX_TRACE_EVENT_NAME_MAX
_POSIX_TRACE_INHERIT_POSIX_TRACE_LOG
_POSIX_TRACE_NAME_MAX_POSIX_TRACE_SYS_MAX
_POSIX_TRACE_USER_EVENT_MAX_POSIX_TTY_NAME_MAX
_POSIX_TYPED_MEMORY_OBJECTS_POSIX_TZNAME_MAX
_POSIX_VERSION_POSIX_V6_ILP32_OFF32
_POSIX_V6_ILP32_OFFBIG_POSIX_V6_LP64_OFF64
_POSIX_V6_LPBIG_OFFBIG_V6_ILP32_OFF32
_V6_ILP32_OFFBIG_V6_LP64_OFF64
_V6_LPBIG_OFFBIGRE_DUP_MAX
SCHAR_MAXSCHAR_MIN
SHRT_MAXSHRT_MIN
SSIZE_MAXSTREAM_MAX
TMP_MAXTZNAME_MAX
UCHAR_MAXUINT_MAX
ULONG_MAXUSHRT_MAX
WORD_BITXBS5_ILP32_OFF32
XBS5_ILP32_OFF32_CFLAGSXBS5_ILP32_OFF32_LDFLAGS
XBS5_ILP32_OFF32_LIBSXBS5_ILP32_OFF32_LINTFLAGS
XBS5_ILP32_OFFBIGXBS5_ILP32_OFFBIG_CFLAGS
XBS5_ILP32_OFFBIG_LDFLAGSXBS5_ILP32_OFFBIG_LIBS
XBS5_ILP32_OFFBIG_LINTFLAGSXBS5_LP64_OFF64
XBS5_LP64_OFF64_CFLAGSXBS5_LP64_OFF64_LDFLAGS
XBS5_LP64_OFF64_LIBSXBS5_LP64_OFF64_LINTFLAGS
XBS5_LPBIG_OFFBIGXBS5_LPBIG_OFFBIG_CFLAGS
XBS5_LPBIG_OFFBIG_LDFLAGSXBS5_LPBIG_OFFBIG_LIBS
XBS5_LPBIG_OFFBIG_LINTFLAGS_XOPEN_CRYPT
_XOPEN_ENH_I18N_XOPEN_IOV_MAX
_XOPEN_LEGACY_XOPEN_NAME_MAX
_XOPEN_PATH_MAX_XOPEN_SHM
_XOPEN_STREAMS_XOPEN_VERSION
_XOPEN_XCU_VERSION_XOPEN_XPG2
_XOPEN_XPG3_XOPEN_XPG4
.TE
.sp
.LP
也可识别 \fBPATH\fR 符号，产生的值与 \fBconfstr()\fR 名称值 \fBCS_PATH\fR 相同。
.SH 用法
.sp
.LP
有关 \fB/usr/bin/getconf\fR 遇到大于或等于 2 GB（2^31 字节）文件时行为的说明，请参见 \fBlargefile\fR(5)。
.SH 示例
.LP
\fB示例 1 \fR编写变量的值
.sp
.LP
本示例说明了 \fB{NGROUPS_MAX}\fR 的值：
.sp
.in +2
.nf
example% \fBgetconf NGROUPS_MAX\fR
.fi
.in -2
.sp
.LP
\fB示例 2 \fR为特定目录编写变量的值
.sp
.LP
本示例说明了特定目录的 \fBNAME_MAX\fR 值：
.sp
.in +2
.nf
example% \fBgetconf NAME_MAX /usr\fR
.fi
.in -2
.sp
.LP
\fB示例 3 \fR处理不确定的结果
.sp
.LP
本实例显示了如何更谨慎地处理可能不确定的结果：
.sp
.in +2
.nf
if value=$(getconf PATH_MAX /usr); then
if [ "$value" = "undefined" ]; then
echo PATH_MAX in /usr is infinite.
else
echo PATH_MAX in /usr is $value.
fi
else
echo Error in getconf.
fi
.fi
.in -2
.sp
.LP
例如：
.sp
.in +2
.nf
sysconf(_SC_POSIX_C_BIND);
.fi
.in -2
.sp
.LP
和
.sp
.in +2
.nf
system("getconf POSIX2_C_BIND");
.fi
.in -2
.sp
.LP
C 程序可能给出不同答案。\fBsysconf\fR 调用提供与程序编译或执行时的条件对应的值，具体取决于实现情况。对 \fBgetconf\fR 的 \fBsystem\fR 调用始终提供与程序执行时的条件对应的值。
.SH 环境变量
.sp
.LP
有关影响 \fBgetconf\fR 执行的以下环境变量的说明，请参见 \fBenviron\fR(5)：\fBLANG\fR、\fBLC_ALL\fR、\fBLC_CTYPE\fR、\fBLC_MESSAGES\fR 和 \fBNLSPATH\fR。
.SH 退出状态
.sp
.LP
将返回以下退出值：
.sp
.ne 2
.mk
.na
\fB\fB0\fR\fR
.ad
.RS 6n
.rt
指定的变量有效，且关于其当前状态的信息已成功写入。
.RE
.sp
.ne 2
.mk
.na
\fB\fB>0\fR\fR
.ad
.RS 6n
.rt
出现错误。
.RE
.SH 属性
.sp
.LP
有关下列属性的说明，请参见 \fBattributes\fR(5)：
.sp
.sp
.TS
tab() box;
cw(2.75i) |cw(2.75i)
lw(2.75i) |lw(2.75i)
.
属性类型属性值
_
可用性system/core-os
_
接口稳定性Committed（已确定）
_
标准请参见 \fBstandards\fR(5)。
.TE
.SH 另请参见
.sp
.LP
\fBsh\fR(1)、\fBpathconf\fR(2)、\fBsysinfo\fR(2)、\fBconfstr\fR(3C)、\fBsysconf\fR(3C)、\fBattributes\fR(5)、\fBenviron\fR(5)、\fBlargefile\fR(5)、\fBstandards\fR(5)