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Top Forums Shell Programming and Scripting Retries in shell programming. Post 302425422 by singh.chandan18 on Friday 28th of May 2010 12:03:07 AM
Old 05-28-2010
Retries in shell programming.

Hello Friends,

I am writng a shell script which will call another script startServer and then execute one more script pingServer to check if the server is up.

As it takes sometimes for the server to start, so I have defined an until loop to check the status of the server until the server is up, by calling the pingServer script again.

I want pingServer script to be executed 4 times in every 4 minutes before terminating the loop.

I've already written a script, so need your guidance and suggestions(mainly in Retries statement) in making the script better.

Code:
 
Scr_Dir=/dise/vclwrk33/J2EEServer/config/ABP-FULL/ABPServer/scripts
Log_File=/tmp/Enabler_Check.log
  Server_Stat=""
  Retries=0
  Retry_Max=4
#Checking if the script is executable by the current process
    if [ -x $Scr_Dir/startServer ]
    then
            echo "Starting the Server now...." >> $Log_File
            $Scr_Dir/startServer > /dev/null 2>&1
             sleep 60
#Until loop to check the status of the server until the server is up
        until [ $Server_Stat = UP ]
        do
              $Scr_Dir/pingServer | grep UP
              if [ $? -eq 0 ]
              then
                      Server_Stat= UP
                      echo "/n Server has been started successfully..../n" >> $Log_File
              else
#Retrying 4 times in every 4 mins
                      Retries=$( expr $Retries + 1 )
                        if [ $Retries -gt $Retry_Max ]
                        then
                             echo "Timed out in starting the Server.." >> $Log_File
                             exit 1
                        else
                             sleep 240
                        fi
             fi
       done
     else
                echo "Error Executing startServer script..." >> $Log_File
                exit 1
     fi

 

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SCRIPT(1)						    BSD General Commands Manual 						 SCRIPT(1)

NAME
script -- make typescript of terminal session SYNOPSIS
script [-akq] [-t time] [file [command ...]] DESCRIPTION
The script utility makes a typescript of everything printed on your terminal. It is useful for students who need a hardcopy record of an interactive session as proof of an assignment, as the typescript file can be printed out later with lpr(1). If the argument file is given, script saves all dialogue in file. If no file name is given, the typescript is saved in the file typescript. If the argument command is given, script will run the specified command with an optional argument vector instead of an interactive shell. The following options are available: -a Append the output to file or typescript, retaining the prior contents. -k Log keys sent to program as well as output. -q Run in quiet mode, omit the start and stop status messages. -t time Specify time interval between flushing script output file. A value of 0 causes script to flush for every character I/O event. The default interval is 30 seconds. The script ends when the forked shell (or command) exits (a control-D to exit the Bourne shell (sh(1)), and exit, logout or control-D (if ignoreeof is not set) for the C-shell, csh(1)). Certain interactive commands, such as vi(1), create garbage in the typescript file. The script utility works best with commands that do not manipulate the screen. The results are meant to emulate a hardcopy terminal, not an addressable one. ENVIRONMENT
The following environment variable is utilized by script: SHELL If the variable SHELL exists, the shell forked by script will be that shell. If SHELL is not set, the Bourne shell is assumed. (Most shells set this variable automatically). SEE ALSO
csh(1) (for the history mechanism). HISTORY
The script command appeared in 3.0BSD. BUGS
The script utility places everything in the log file, including linefeeds and backspaces. This is not what the naive user expects. It is not possible to specify a command without also naming the script file because of argument parsing compatibility issues. When running in -k mode, echo cancelling is far from ideal. The slave terminal mode is checked for ECHO mode to check when to avoid manual echo logging. This does not work when in a raw mode where the program being run is doing manual echo. BSD
January 22, 2004 BSD
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