Either this or you create a semaphore file: consider the following script stub:
This makes sure the script runs only one instance at a time.
I hope this helps.
bakunin
Not quite. There is a race condition between the time the existence test ([ -e "$fSemaphore" ]) is executed and the time the semaphore file is created (touch "$fSemaphore") that can allow two or more copies of this code to run simultaneously and not realize that another invocation is running.
This can be worked around with the shell's do not clobber option:
Note that both of these run a risk of leaving the semaphore file in place if the script is terminated by a kill signal (for the code above) or by any signal (for the code bakunin suggested). If this happens, the semaphore file will have to be manually removed before the script will run again successfully.
I am in need of some help; think I have confused myself.
Here is the issue I am faced with.
The script log file was fine, the nohup.out file has tens of thousands of lines like illegal use of sleep: sleep seconds
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Hi Forum
Im using sleep in a while loop goes around 10 times. i feed it a variable with the time i what it to sleep for eg sleep $sleepVal and then print system date and time to screen but sometimes 1 second is added to the time why is this
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i am very new to shall script . i am not that much aware of sleep command ,
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Hello,
Need a little help with the script below. I can't get it to sleep :( I'm trying to get this to check if the process is running and if it is, wait 10 secs and check again. Keep doing this until it's not running and then stop checking and send the email.
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Discussion started by: pallvi_mahajan
15 Replies
LEARN ABOUT MOJAVE
kill.d
kill.d(1m) USER COMMANDS kill.d(1m)NAME
kill.d - snoop process signals as they occur. Uses DTrace.
SYNOPSIS
kill.d
DESCRIPTION
kill.d is a simple DTrace program to print details of process signals as they are sent, such as the PID source and destination, signal num-
ber and result.
This program can be used to determine which process is sending signals to which other process.
Since this uses DTrace, only users with root privileges can run this command.
EXAMPLES
Default output, print process signals as they are sent.
# kill.d
FIELDS
FROM source PID
COMMAND
source command name
TO destination PID
SIG destination signal ("9" for a kill -9)
RESULT result of signal (-1 is for failure)
DOCUMENTATION
See the DTraceToolkit for further documentation under the Docs directory. The DTraceToolkit docs may include full worked examples with ver-
bose descriptions explaining the output.
EXIT
kill.d will run forever until Ctrl-C is hit.
AUTHOR
Brendan Gregg [Sydney, Australia]
SEE ALSO dtrace(1M), truss(1)version 0.90 May 14, 2005 kill.d(1m)