#!/bin/bash
(
echo "Hi!"
# Using 'exec' means less mess if something goes wrong,
# since the subshell is replaced wholly by it.
exec sleep 1000
# Less stderr noise if you use 'disown'.
# If your shell doesn't have disown, it doesn't need it.
) & disown
PID="$!" # The PID of the background process
MAXTIME=5
X=0 ; while [ "$X" -lt "$MAXTIME" ]
do
let X=X+1
# If the process is done, quit immediately
ps "$PID" 2>&1 >/dev/null || exit
echo "$X seconds, $PID still exists" >&2
sleep 1
done
# The query hasn't finished in 5 seconds, so kill it.
kill "$PID" >/dev/null 2>&1 || exit
ERECIPIENT3="email.com"
# echo "Connection on status: is Down"|mail -s "Subject:" "${ERECIPIENT3}" >/dev/null 2>/dev/null
sleep 1 # Wait a second for it to die
# Kill it with a more severe signal and exit if it doesn't exist
kill -QUIT "$PID" >/dev/null 2>&1 || exit
sleep 1
# Try and kill it again with an unblockable signal, quit if it doesn't exist
kill -9 "$PID" # Last resort
exit
If 'mail' is hanging, it might be a good idea to find out why.
hey Corona, thanks for the detailed help.
So basically I am trying out your script however I have a question about $! 's- functionality.
does it pick from within the script the most recent shell script or does it grab from all running scripts.
I am wonderring cause the documentation on it is confusing me. and the way we schedule linux scripts we have many running simultaneously and any clarification you can give me on $! would help clear my worries about it. - I am still googling
but does it grab from the entire history linux processes running at the time or will it only grab from within the script.
I will post my final script later so you guys can look and see what I was trying in the first place.
and FYI- the reason I am seperating the DB-connections is that the system hangs on lets say the first variable assignment which is a query from the DB.
--Your solution seems to cover it so thanks, -will be testing it for a day or so to see it on my dev environment. -I will proably use once I understand the scope of $!
Thanks.
---------- Post updated at 10:50 AM ---------- Previous update was at 10:30 AM ----------
I understand $! grabs from inside script can someone confirm??
hey Corona, thanks for the detailed help.
So basically I am trying out your script however I have a question about $! 's- functionality.
does it pick from within the script the most recent shell script or does it grab from all running scripts.
$! is the process ID of whatever you backgrounded (i.e, ran with &) most recently inside the current shell.
So if you did ( .... ) & you would get the process ID of the subshell.
If you did sleep 1000 & you would get the process ID of sleep without any subshell involved at all.
etc.
BASH also has another meaning for "!", which relates to the shell history -- but, like aliases, this does not happen inside a shell script, only in live interactive terminal sessions.
You might want to comment out the echo inside that loop before deploying. I'm not sure where all those debug statements will end up, if anywhere. Don't want them piling up in some neglected logfile
Will do and thanks for the heads up!
is there a any logs in specific your thinking of? i'm just curious.
what causes the pileup ? termination of the script ?
Will do and thanks for the heads up!
is there a any logs in specific your thinking of? i'm just curious.
I don't know, that depends on what's running it. That's why any programs you write should make as little noise as possible unless they actually have anything important to say.
If it's run by an init script, it might end up somewhere in /var/log.
If it's run by cron, any program output from that gets automatically emailed to user@hostname via the server's own MTA... or dumped in $HOME/dead.letter if none's available. (Meaning, if it is cron-ed, it might be possible to simplify that script by letting cron do the mailing for it.)
etc.
It might go nowhere at all. It's not THAT big a deal in the end. I just don't want you to end up with a slowly growing file under /var/log which will get ignored for 10 years until the partitions full... Or a confused customer wondering why they're suddenly getting 3 emails full of nonsense a day
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How can i send a mail when user login in unix ENV.
How can i know present use mailID??
Moved out of Contact Us Forum - Please Do Not Post Technical Questions in Non-Technical Forum(s) (1 Reply)
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Dear all,
how can i send mail using mailx or mail command?do i need to configure anything for sending mail?please help me.Its urgent.
the version i use is
Linux TDM 2.4.21-4.EL #1 Fri Oct 3 18:13:58 EDT 2003 i686 i686 i386 GNU/Linux
Thanks
Regards,
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08-01-2014
