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手册页第 1 部分:用户命令     Oracle Solaris 11.1 Information Library (简体中文)
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sleep

- suspend execution for an interval

用法概要

/usr/bin/sleep interval[d|h|m|s]...

描述

sleep suspends execution for at least the time in seconds specified by seconds or until a SIGALRM signal is received. The seconds operand can be specified as a floating point number but the actual granularity normally depends on the underlying system.

操作数

interval

A floating-point number specifying the time for which to suspend execution. The floating-point number may be specified in all formats required by C99/XPG6, including constants such as Inf or infinite. One of four suffixes may optionally be specified, indicating the number specified is days (d), hours (h), minutes (m), or seconds (s). With no suffix, the interval is assumed to be seconds. If multiple intervals are specified they are summed together. Individual intervals may be negative but the sum must be greater than or equal to zero.

示例

示例 1 Suspending Command Execution

The following example executes a command after a certain amount of time:

example% (sleep 105; command)&

示例 2 Executing a Command Every So Often

The following example executes a command every so often:

example% while true
do
        command
        sleep 37
done

示例 3 Suspending Command Execution Forever

The following example suspends command execution forever or until a SIGALRM signal is received:

example% sleep Inf

示例 4 Suspending Command Execution for 0.5 Seconds

Suspending command execution for 0.5 seconds using an alternative floating-point representation for the value 0.5:

example% printf "%a\n" 0.5
0x1.0000000000000000000000000000p-01
example% sleep 0x1.0000000000000000000000000000p-01

示例 5 Suspending Execution for 23 Hours

The following example suspends execution for twenty three hours using a letter suffixes:

example% sleep 1d -1h

环境变量

See environ(5) for descriptions of the following environment variables that affect the execution of sleep: LANG, LC_ALL, LC_CTYPE, LC_MESSAGES, and NLSPATH.

退出状态

The following exit values are returned:

0

The execution was successfully suspended for at least time seconds, or a SIGALRM signal was received (see NOTES).

>0

An error has occurred.

属性

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPE
ATTRIBUTE VALUE
Availability
system/core-os
Interface Stability
Committed
Standard

另请参见

wait(1), alarm(2), sleep(3C), attributes(5), environ(5), standards(5)

附注

If the sleep utility receives a SIGALRM signal, one of the following actions is taken:

The sleep utility takes the standard action for all other signals.