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Top Forums Shell Programming and Scripting Avoid locking between two files: Post 302862069 by gnnsprapa on Thursday 10th of October 2013 06:00:03 AM
Old 10-10-2013
Avoid locking between two files:

Hi frnz,

I have requirement as follows..

There are two Modules say A and B...n both have few set of files..we have one script which read these files and load into database(vertica) table..while running script smtimes i encounter an error like one table is getting loaded from A module file also and module B file also..and due to this licking my script fails.

Now A & B run parellely so when A's file getting loaded into table it locks the table and B files fails to load..

so i want to add a piece of code where my script will wait till A file completley load into table and stop the file of B..n once A file loaded it will start loading B file into B..

Overall i need to Develop table update dependency tracking to avoid query failure due to table lock.
I knw its very confusing but if anyone can provide some input , i wud be very grateful..

ThanxSmilie
 

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R2E(1)							      General Commands Manual							    R2E(1)

NAME
r2e - receive RSS feeds by email SYNOPSIS
r2e [-d dir] action [options] DESCRIPTION
r2e is a simple program which you can run in your crontab. It watches RSS feeds and sends you nicely formatted email message for each new item. The program is configured by ~/.rss2email/config.py by default. To use a different config file in a different directory, you can specify the -d option before any actions. For a quick start with r2e, try these steps: r2e new your@address r2e add http://feed.url/somewhere.rss r2e run The last command should eventually be put into your crontab, if you want things be sent you automatically. It is possible to use authenticated feeds using the following syntax: r2e add http://user:password@example.com/feed ACTIONS
new [youremail] Create a new feedfile. If the second option is specified, it sets the default email address that mails are sent to. add url [youremail] Subscribe to a feed. The first option is the URL of the feed. The optional second option is the email address to send new items to. Repeat for each feed you want to subscribe to. run [--no-send] [num] Scan the feeds and send emails for new items. This can be run in a cron job. The --no-send option stops r2e from sending any email. This can be useful the first time you run it, as otherwise it would send every available story. If a number is specified, r2e will only download that feed. The list command lists the feed numbers. email yournewemail Change the default email address. list List all your currently subscribed feeds. delete n Delete a feed, using its number from the list command. pause n Temporarily ignore a feed. A paused feed won't be updated at all. unpause n Re-enable updates from a feed. opmlimport url Import feeds from an OPML file. opmlexport Export feeds to standard output, as an OPML file. CONFIGURATION
The program's behavior can be controlled via the ~/.rss2email/config.py config file. The file is a python file, so variables are set using a syntax like this: VARIABLE = "value" If the value is a number, the quotes may be omitted. Most configuration variables in the file are boolean values, where a 1 indicates the option is set, and a 0 disables it. See the example config.py file for a full list of available configuration variables. FILES
~/.rss2email/feeds.dat The database of feeds. Use r2e to add, remove, or modify feeds, do not edit it directly. ~/.rss2email/config.py If this file exists, it it read to configure the program. AUTHOR
Aaron Swartz <rss2email@aaronsw.com> R2E(1)
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