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Check to see if python script is running
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Drop a pidfile somewhere (e.g. /tmp). Then you can check to see if the process is running by checking to see if the PID in the file exists. Don't forget to delete the file when you shut down cleanly, and check for it when you start up....
sed command with -i option (in-place editing) works fine on Ubuntu but not Mac [duplicate]
...u have installed or other gizmos I've seen suggested. I hope you keep the file under version control (or otherwise backed up) so that you can recover if there's a bug in your sed script. Of course, the .bak file gives you that protection.
– Jonathan Leffler
J...
How do you configure Django for simple development and deployment?
...hings manually, my earlier answer still applies:
I have multiple settings files.
settings_local.py - host-specific configuration, such as database name, file paths, etc.
settings_development.py - configuration used for development, e.g. DEBUG = True.
settings_production.py - configuration used fo...
What is the purpose of Serialization in Java?
..., rather than hold onto the giant object in memory, just cache it out to a file via serialization, and read it in later when it's needed.
Cross JVM Synchronization: Serialization works across different JVMs that may be running on different architectures.
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What do the makefile symbols $@ and $< mean?
...target being generated, and $< the first prerequisite (usually a source file). You can find a list of all these special variables in the GNU Make manual.
For example, consider the following declaration:
all: library.cpp main.cpp
In this case:
$@ evaluates to all
$< evaluates to library.cpp
$...
Storing Images in PostgreSQL
...ck your needs and server configs (ex. Apache modules): store thumbnails at file system may be better, compare performances. Remember that it is a (unified) web-service, then can be stored at a separate database (with no backups), serving many tables. See also PostgreSQL binary data types manual, t...
How do you search an amazon s3 bucket?
I have a bucket with thousands of files in it. How can I search the bucket? Is there a tool you can recommend?
21 Answers
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How to check for a valid URL in Java?
... 5 6 7 8 9
/**
* Schema/Protocol (ie. http:, ftp:, file:, etc).
*/
private static final int PARSE_URL_SCHEME = 2;
/**
* Includes hostname/ip and port number.
*/
private static final int PARSE_URL_AUTHORITY = 4;
private static final int PARSE_URL_PATH = 5;
private static...
Android: Want to set custom fonts for whole application not runtime
...me ? (i.e. from xml if possible or only once for whole application in JAVA file)
11 Answers
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Unable to create/open lock file: /data/mongod.lock errno:13 Permission denied
...updated the path in etc/mongodb.conf to /data/db and deleted the old mongo files in /var/lib/mongodb directory.
Then I ran sudo service mongodb start and waited about a minute. If you try to connect to 27017 immediately you won't be able to.
After a minute check /data/db (EBS volume) and mongo shoul...