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Top Forums UNIX for Dummies Questions & Answers sleep 10 && command doesn't work Post 302307365 by otheus on Wednesday 15th of April 2009 07:10:27 AM
Old 04-15-2009
When you log out of a terminal, a HUP signal is sent to the shell, which passes that signal on to all the tasks/jobs you have running in that terminal. The && means "run the second command if the first command succeeded", and exiting with a signal usually means the command did [i]not[i] succeed, so the second command should not run. So the question really is, why does the first command work? That I am unsure about it. It could be a matter of timing -- you log out just as the sleep command exits.

If you are using BASH, there are several caveats to all this.

If you want to make sure something finishes even after you log off, you can do:
Code:
nohup sh -c "sleep 10; /etc/init.d/networking force-reload" &

 

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sleep(1)							   User Commands							  sleep(1)

NAME
sleep - suspend execution for an interval SYNOPSIS
sleep time DESCRIPTION
The sleep utility will suspend execution for at least the integral number of seconds specified by the time operand. OPERANDS
The following operands are supported: time A non-negative decimal integer specifying the number of seconds for which to suspend execution. EXAMPLES
Example 1: Suspending command execution for a time To execute a command after a certain amount of time: example% (sleep 105; command)& Example 2: Executing a command every so often example% while true do command sleep 37 done ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables that affect the execution of sleep: LANG, LC_ALL, LC_CTYPE, LC_MES- SAGES, and NLSPATH. EXIT STATUS
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. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ SEE ALSO
wait(1), alarm(2), sleep(3C), wait(3UCB), attributes(5), environ(5), standards(5) NOTES
If the sleep utility receives a SIGALRM signal, one of the following actions will be taken: o Terminate normally with a zero exit status. o Effectively ignore the signal. The sleep utility will take the standard action for all other signals. SunOS 5.10 1 Feb 1995 sleep(1)
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