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Full Discussion: Loop to run commands - after the previous instance completed
Top Forums Shell Programming and Scripting Loop to run commands - after the previous instance completed Post 303014107 by neil.k on Monday 5th of March 2018 10:49:58 AM
Old 03-05-2018
Loop to run commands - after the previous instance completed
Hi All,

I am trying to call a shell script in a loop. I want my first instance to complete, and then the 2nd instance of the command to start - and so on.

eg. I am running this script 30 times. The wrapper script needs business date, from_time,to_time & server_name as inputs.

Code:
script_name businees_date from_time to_time server_name
--------------------------------------------------------
wrapper.sh "20180305" "09:30:00" "09:30:59" P6
wrapper.sh "20180305" "09:31:00" "09:31:59" P6
wrapper.sh "20180305" "09:32:00" "09:32:59" P6

The wrapper script takes almost 8-10 minutes to execute per run.

With my below code, it calls the wrapper script "n" times, without waiting for the previous instance of the command to complete.
How do I make the 1st instance of the wrapper to finish, before the 2nd gets called - and so on.

Code:
bdate=`date +%Y%m%d`
server_name=P6
script='wrapper.sh'
config=min_by_min.txt

while read -r from_time to_time; do
$script $bdate $from_time $to_time $server_name
done < $config

The config file looks like this.
Code:
$head -4 min_by_min.txt
"09:30:00" "09:30:59"
"09:31:00" "09:31:59"
"09:32:00" "09:32:59"
"09:33:00" "09:33:59"

Can you guys please help?
Last edited by rbatte1; 03-06-2018 at 08:11 AM.. Reason: Added CODE tags round the input/output
 

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LEARN ABOUT DEBIAN

airport-modem

AIRPORT-MODEM(1)					      General Commands Manual						  AIRPORT-MODEM(1)

NAME

       airport-modem  - Modem monitoring and hangup utility for the original Apple AirPort Base Station ("Graphite"), the Lucent RG-1000 base sta-
       tion and the Apple Airport Extreme base station

SYNOPSIS

       airport-modem

DESCRIPTION

       airport-modem allows you to monitor the state of the internal modem of your base station and to start/stop the modem connection.

       On the AirPort Extreme base station, the modem utility can also display the approximate duration of the modem connection.

OPTIONS

       airport-modem accepts no command-line options. airport-modem is a wrapper script around the AirportBaseStationHangup.jar jar  file  located
       in /usr/share/java/airport-utils.

       You  can set the JAVACMD environment variable to use a specific JVM instead of the one chosen by the wrapper script. Set the DEBUG environ-
       ment variable to 1 to get the debug output from the wrapper script.

ENVIRONMENT VARIABLES

       DEBUG  Set this variable to 1 to get the debug output from the wrapper script.

       JAVACMD
	      The full path to the Java Virtual Machine to use.  By  default,  the  wrapper  uses  JAVACMD;  if  it  is  not  set,  it	looks  for
	      JAVA_BINDIR/java, then for JAVA_HOME/bin/java before looking for a java executable in the PATH. In the latter case, the JVM used can
	      be configured using the Debian alternatives system (see update-alternatives(8)).

       JAVA_HOME
	      The full path where your JDK/JRE is installed.

       JAVA_BINDIR
	      The full path to the directory where the java executable is located.

       JAVA_ARGS
	      Extra command-line arguments to be passed to the Java Virtual Machine.

AUTHOR

       airport-modem was written by Jon Sevy <jsevy@cs.drexel.edu>.

       This manual page was written by Julien BLACHE <jblache@debian.org>, for the Debian project (but may be used by others).

								   May 20, 2006 						  AIRPORT-MODEM(1)
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