Shells (bash, ksh, etc) do not propagate signals to non-builtin commands. To illustrate this a bit better, I replaced the sleep in your script with a script tasker
Nothing fancy, it counts down from 9 with one second delays. So your script is now (with some echos):
And when run:
What you need to do is have the watchdog kill the subprocess directly:
Which runs as:
Now if the task finishes first, the script will still sleep for the full interval:
Hope this helps.
:confused:
I have not written any code in about 15 years. The company I work for has Unix servers and they utilize KSH. The scriptors say that what I want can only be scripted in PERL which on my server they say they cannot get to work. They also tell me that what I want done cannot be... (0 Replies)
Hi all
i have simple c program , when i wish to kill the app
im using kill(0,-9) , but it seams this command don't do any thing and the program.
just ignore it .
what im doing wrong here ?
im using HP-UX ia64
Thanks (9 Replies)
for each file if file name like xx*
for each line in a file
if substring(3,6) found in another txt file
output to file-a( filename = orginal file + _a)
else
output to file-b( filename = orginal file + _a)
end
Next Line (4 Replies)
Hello everybody!
I am new to this and I am trying to change a script in an open source program that plots some offset vectors and then calls a postscript viewer. I have commented away the call for the postscript viewer but somehow the script doesn't return to the shell prompt. I cant figure out... (3 Replies)
if {"$my_ext_type" = MAIN]; then
cd $v_sc_dir
Filex.SH $v_so_dir\/$v_fr_file
Can somebody tell me what does this suggest. I am pretty new to unix and
I am getting confused.
What i understood from here is
If we have a file extension name as MAIN
which we have then we change the directory to... (1 Reply)
Hi all.
The startup script in /usr/local/bin.
After user login the script run an application.
Iwould in the same way run the another application.
How to make It similar?
Where I must to look?
Regards. (3 Replies)
Hy again guys,
Last week i resolve a question here but now i need your help again :rolleyes:
I have about 3000 files that i need to choose based on the lowest value, so i make temp files like this:
The files can have lines from 1-10 but only 2 columns, the point is to grep the name os the... (2 Replies)
Don,
I revised script but when I ran it I did not receive any log. I am not sure what you mean to run it in code tags. I am using a putty session and ssh but I did not get a trace log?
Barb
---------- Post updated at 01:33 PM ---------- Previous update was at 01:27 PM... (2 Replies)
Hi Guys,
I am very new to shell script and I need your help here to write a script. Actually, I have a script abc.sh which don't get terminated itself. So I need to design a script to run this script, save the output to a file, search for a given string in the output and if it exists send those... (11 Replies)
Discussion started by: Sambit Sahu
11 Replies
LEARN ABOUT PHP
wait
wait(1) User Commands wait(1)NAME
wait - await process completion
SYNOPSIS
/bin/sh
wait [pid...]
/bin/jsh /bin/ksh /usr/xpg4/bin/sh
wait [pid...]
wait [ % jobid...]
/bin/csh
wait
DESCRIPTION
The shell itself executes wait, without creating a new process. If you get the error message cannot fork,too many processes, try using the
wait command to clean up your background processes. If this doesn't help, the system process table is probably full or you have too many
active foreground processes. There is a limit to the number of process IDs associated with your login, and to the number the system can
keep track of.
Not all the processes of a pipeline with three or more stages are children of the shell, and thus cannot be waited for.
/bin/sh, /bin/jsh
Wait for your background process whose process ID is pid and report its termination status. If pid is omitted, all your shell's currently
active background processes are waited for and the return code will be 0. The wait utility accepts a job identifier, when Job Control is
enabled (jsh), and the argument, jobid, is preceded by a percent sign (%).
If pid is not an active process ID, the wait utility will return immediately and the return code will be 0.
csh
Wait for your background processes.
ksh
When an asynchronous list is started by the shell, the process ID of the last command in each element of the asynchronous list becomes
known in the current shell execution environment.
If the wait utility is invoked with no operands, it will wait until all process IDs known to the invoking shell have terminated and exit
with an exit status of 0.
If one or more pid or jobid operands are specified that represent known process IDs (or jobids), the wait utility will wait until all of
them have terminated. If one or more pid or jobid operands are specified that represent unknown process IDs (or jobids), wait will treat
them as if they were known process IDs (or jobids) that exited with exit status 127. The exit status returned by the wait utility will be
the exit status of the process requested by the last pid or jobid operand.
The known process IDs are applicable only for invocations of wait in the current shell execution environment.
OPERANDS
The following operands are supported:
One of the following:
pid The unsigned decimal integer process ID of a command, for which the utility is to wait for the termination.
jobid A job control job ID that identifies a background process group to be waited for. The job control job ID notation is applicable
only for invocations of wait in the current shell execution environment, and only on systems supporting the job control option.
USAGE
On most implementations, wait is a shell built-in. If it is called in a subshell or separate utility execution environment, such as one of
the following,
(wait)
nohup wait ...
find . -exec wait ... ;
it will return immediately because there will be no known process IDs to wait for in those environments.
EXAMPLES
Example 1: Using A Script To Identify The Termination Signal
Although the exact value used when a process is terminated by a signal is unspecified, if it is known that a signal terminated a process, a
script can still reliably figure out which signal is using kill, as shown by the following (/bin/ksh and /usr/xpg4/bin/sh):
sleep 1000&
pid=$!
kill -kill $pid
wait $pid
echo $pid was terminated by a SIG$(kill -l $(($?-128))) signal.
Example 2: Returning The Exit Status Of A Process
If the following sequence of commands is run in less than 31 seconds (/bin/ksh and /usr/xpg4/bin/sh):
sleep 257 | sleep 31 &
jobs -l %%
then either of the following commands will return the exit status of the second sleep in the pipeline:
wait <pid of sleep 31>
wait %%
ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables that affect the execution of wait: LANG, LC_ALL, LC_CTYPE, LC_MES-
SAGES, and NLSPATH.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
|Interface Stability |Standard |
+-----------------------------+-----------------------------+
SEE ALSO csh(1), jobs(1), ksh(1), sh(1), attributes(5), environ(5), standards(5)SunOS 5.10 12 Dec 1997 wait(1)