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Top Forums Shell Programming and Scripting How to check if another instance of the process is running Post 76451 by vino on Tuesday 28th of June 2005 11:13:29 AM
Old 06-28-2005
Creating locks based on pids would'nt help. Each process that starts off, gets a new pid.

You mention that multiple scripts are involved. This is the chain of commands that I understood.

script1 -> script2 -> native code

i.e. script1 does something, calls script2, does something and then your app. is called.

This is what you should do.

Script1 checks for 'no ps count' and 'no lock file'. Hence your app. is not running. Create a lockfile and start script2.

Script2 checks for lock file and 'starts your app.' and 'deletes the lockfile'.

Now when you run script1 again, it will fail because will find 'ps count'.

Try it out.

Hope I didnt make any fatal flaws/assumptions. Smilie

'no ps count' is your original ps command.

vino
 

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MONGO(1)							  Mongo Database							  MONGO(1)

NAME
mongo - the Mongo command-line tool SYNOPSIS
mongo [OPTIONS] [DB_ADDRESS] [FILE+] DESCRIPTION
mongo is a JavaScript shell (with GNU readline capabilities). It supports interactive and non-interactive use. When used interactively, JavaScript can be used to query the database or perform any other function normally available with SpiderMonkey. Database output is dis- played in JSON format. If JavaScript files are specified on the command line, the shell will run non-interactively, running each one in sequence and then exiting. EXAMPLES
mongo start the shell, connecting to the server at localhost:27017 and using the test database mongo foo start the shell using the foo database at localhost:27017 mongo 192.169.0.5/foo start the shell using the foo database at 192.169.0.5:27017 mongo 192.169.0.5:9999/foo start the shell using the foo database at 192.169.0.5:9999 mongo script1.js script2.js script3.js run three scripts and exit OPTIONS
--shell run the shell after executing files --help show usage information --host HOST server to connect to (default HOST=localhost) --port PORT port to connect to (default PORT=27017) --nodb do not connect to mongod --eval SCRIPT evaluate JavaScript -u USERNAME specify user to log in as -pPASSWORD specify password of user (notice there is no space) COPYRIGHT
Copyright 2007-2009 10gen SEE ALSO
For more information, please refer to the MongoDB wiki, available at http://www.mongodb.org. AUTHOR
Kristina Chodorow 10gen June 2009 MONGO(1)
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