I recall on one O/S the ksh would run ksh scripts in the same pid, so you would see interactive background with wait, but in Solaris it is always a child process, and waits only for its own children. I ended up putting () around lines 2-$ to keep my environment from getting scrambled by my scripts.
I guess wait on LINUX waits for everything. I wonder if nohup helps to move the script away. It might be an interesting man page read or such, to find out whether it is waiting for all processes on the tty or on the process group. But yes, collecting pids and waiting for them one at a time is best, as you get the exit return $? of each child from "wait $child_pid".
If the exit status is not a biggie, or you check that through log files, you can skill the wait and monitor the children through shared stdout and stderr, like this:
This monitors not only the children but their children and so on, as long as they do not redirect both stdout and stderr. Even when "wait $child_pid" returns, the child may have antecedents still running, background or up-pipeline processes that close stdout but do not immediately exit, or someone down-pipeline exits cutting them off! $! is just the parent or last in pipeline pid.
The ability of processes other than $! to get errors not reported on $? is one reason to rely on logs, or write a very attentive wrapper script to keep an eye on the children and report $? for all. Sometimes I get really formal, for money and my job security and all that. This is fine for interactive, but not so wise unattended:
Last edited by DGPickett; 10-29-2010 at 12:52 PM..
This might be a bug in the version of ksh that you have which is likely fixed in the current release.
I'm running 'Version JM 93t+ 2009-02-02' on some boxes, and 'Version JM 93t+ 2010-06-21' on most of my linux boxes. Testing on the older of the two it handled your script without any problems:
I added start/finish messages to show the delay, if there was any. There is a more recent release than the 6/21/2010 version; it can be pulled direcly from AT&T Labs-Research; AST software download
As a further test, I put this little script together that reads lines with one or more sleep times and sets that many async sleep processes going. It is similar to the script you are running and it seems to have no issues with a more recent version of ksh.
Sometimes I script parallel processing logging so it looks like it was done sequentially, both to keep from mixing line fragments and so as not to confuse the onlookers in their less sophisticated moments (-:
#!/bin/sh
# This script returns the number of rows updated from a function
echo "The execution is starting ....."
sqlplus -silent $UP <<EOF
set serveroutput on
set echo off
set pagesize 0
VAR no_rows_updated NUMBER;
EXEC :no_rows_updated :=0;
DECLARE
CURSOR c_update is
SELECT * FROM... (4 Replies)
Hi All,
I have a question related to Shell scripting. In my shell script, I have following two commands in sequence:
sed 's/^/grep "^120" /g' $ORIGCHARGEDAMTLIST|sed "s;$;| cut -f$FIELD_NO1 -d '|' | awk '{ sum+=\$1} END {printf (\"%0.2f\\\n\", sum/100)}' >$TEMPFILE
mv $TEMPFILE $ORIGFILE... (3 Replies)
Hi, I have a script that seems to run to completion when in the command-line, but when it is run using the cron, it seems to time out.
They both start and run fine, but on the CRON it stops prematurely.
The script hits an API every few seconds and grabs data.
Does anyone have any idea on... (4 Replies)
Hello Team,
As a part of my job we have made a script to automate a service to restart frequently.
Script having two functions when executing it's should find the existing service and kill it, then start the same service . Verified the script it's working fine when executing... (18 Replies)
Hello Guys,
I have scratched my head alot on this but couldn't find clue what's wrong. Can you please help me with this? My problem is as following.
1) When I manually execute following script it runs successfully with below output.
bash-3.00# more smssend
#!/bin/bash
echo -e "<Request... (16 Replies)
Hi, I'm new to these forums, and I'm hoping that someone can solve this problem...
To make things short:
I have DD-wrt set up on a router.
I'm trying to run a script in CRON that fetches the daily password from my database using SSH.
CRON is set like so(in web interface):
* * * *... (4 Replies)
Hello all,
Here is what my bash script does: sums number columns, saves the tot in new column, outputs if tot >= threshold val:
> cat getnon0file.sh
#!/bin/bash
this="getnon0file.sh"
USAGE=$this"
InFile="xyz.38"
Min="0.05"
#
awk '{sum=0; for(n=2; n<=NF; n++){sum+=$n};... (4 Replies)
Hi,
My script is running with no erros but not giving any output can anyonehelp.
#!/bin/ksh
. /home/application/bin/application.env
OUTFILE=Result.txt
PROD_PASSWORD=`${GET_PWD} -f ${PWD_FILE_PATH} -s ${PROD_SERVER} -u ${PROD_USER}`
echo "1)To get the book last loaded details "
read... (7 Replies)
Okay, I have the following script that runs fine from a command line as well as an executable .sh file. It just moves any file/folder with movie* in the name to a folder called _Movies. The issue I'm running into is when it's call from a cron.
find /mnt/HD_a2/BT/complete -iname "movie.*" -exec... (4 Replies)
I have a .sh script which was running fine on all the UNIX Servers (AIX, SunSolaris). The script requires two mandatory parameters and many optional parameters. Now at a different client place who are on a Windows Server, when I try to execute the script through MKS Toolkit, there are couple of... (5 Replies)