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Top Forums UNIX for Dummies Questions & Answers How to write code for a Logging Event? Post 302579487 by theKbStockpiler on Monday 5th of December 2011 08:18:27 PM
Old 12-05-2011
Lets say I'm trying to write to a file and the operation of doing this fails. Wouldn't I have to write additional code to make sure every outcome of my code was successful ,make sure data was written to the said file? If an error is not checked the application will just go on running code. An error is only an error if it is defined as one, otherwise the CPU continues running the code with erroneous data.

An analogy would be checking a simple mathematical addition equation by subtracting one of the addends from the sum to see if the other addend was left. If this check is not made we are not aware of the error and computations using this faulty data continue.


This webpage gives my original post some structure http://wiki.webratio.com/index.php/Debugging_with_application's_logs

I got to this topic indirectly from ELF files so that won't help much. Let's say I'm writing an application and think it will be useful to have some log files to view so when it crashes I will have a clue of what to look at to solve the problems the application is experiencing.

Last edited by theKbStockpiler; 12-05-2011 at 09:58 PM..
 

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MOIN(1) 							   User Commands							   MOIN(1)

NAME
moin - Moinmoin wiki management command-line interface SYNOPSIS
moin [general options] [command command-subcommand] [specific options] moin [--help|--version] DESCRIPTION
moin is a tool to interact with moinmoin wiki from the command line. The command can manipulate moinmoin user accounts, print/dump data, import irclogs, do maintenance task, etc. This command should be executed under the operating system account that "own" the wiki content (files). OPTIONS
--config-dir=DIR Path to the directory containing the wiki configuration files. [default: current directory] (Debian's /usr/bin/moin defaults to /etc/moin/) --wiki-url=WIKIURL URL of a single wiki to migrate e.g. http://localhost/mywiki/ [default: CLI] --page=PAGE wiki page name [default: all pages] --version show program's version number and exit -q, --quiet Be quiet (no informational messages) --show-timing Show timing values [default: False] MOIN COMMANDS
moin command supports many commands, which in turns have sub-commands. account check --help [check-option] When using ACLs, a wiki user name has to be unique, there must not be multiple accounts having the same username. The problem is, that this was possible before the introduction of ACLs and many users, who forgot their ID, simply created a new ID using the same user name. Because access rights (when using ACLs) depend on the NAME (not the ID), this must be cleaned up before using ACLs or users will have difficulties changing settings and saving their account data (system won't accept the save, if the user name and email is not unique). account create --help [create-option] This tool allows you to create user accounts via a command line interface. account disable --help [disable-option] This tool allows you to disable user accounts via a command line interface. account homepage --help [homepage-option] This tool allows you to create user homepages via a command line interface. account resetpw --help [resetpw-option] This tool allows you to change a user password via a command line interface. cli show --help [show-option] Just run a CLI request and show the output. export dump --help [dump-option] This tool allows you to dump MoinMoin wiki pages to static HTML files. export package --help [package-option] This tool allows you to create a package of certain wiki pages. import irclog --help [irclog-option] This script pushes files from a directory into the wiki (to be exact: it pushes all except the last file, as this is maybe still written to in case of irc logs). One application is to use it to store IRC logs into the wiki. import wikipage --help [wikipage-option] index build --help [build-option] This tool allows you to control xapian's index of Moin. maint cleancache --help [cleancache-option] This script allows you to globally delete all the cache files in data/pages/PageName/cache/ and /data/cache directories You will usually do this after changing MoinMoin code, by either upgrading version, installing or removing macros or changing the regex expression for dicts or groups. This often makes the text_html file invalid, so you have to remove it (the wiki will recreate it automatically). text_html is the name of the cache file used for compiled pages formatted by the wiki text to html formatter. maint cleanpage --help [cleanpage-option] This tool outputs a shell script which upon execution will remove unused or trashed pages from the wiki. maint cleansessions --help [cleansessions-option] This script allows you to clean up session files (usually used to maintain a "logged-in session" for http(s) or xmlrpc). maint globaledit --help [globaledit-option] This tool allows you to edit all the pages in a wiki. maint mailtranslators --help [mailtranslators-option] This tool allows you to have a message read in from standard input, and then sent to all translators via email. If you use %(lang)s in the message it will be replaced with the appropriate language code for the translator. maint makecache --help [makecache-option] This script allows you to create cache files in data/pages/PageName/cache/ and /data/cache directories You will usually do this after changing MoinMoin code and calling "maint cleancache", by either upgrading version, installing or removing macros. text_html is the name of the cache file used for compiled pages formatted by the wiki text to html formatter. maint mkpagepacks --help [mkpagepacks-option] This tool generates a set of packages from all the pages in a wiki. maint reducewiki --help [reducewiki-option] This tool allows you to reduce a data/ directory to just the latest page revision of each non-deleted page (plus all attachments). This is used to make the distributed underlay directory, but can also be used for other purposes. So we change like this: * data/pages/PageName/revisions/{1,2,3,4} -> data/pages/revisions/1 (with content of 4) * data/pages/PageName/current (pointing to e.g. 4) -> same (pointing to 1) * data/pages/PageName/edit-log and data/edit-log -> do not copy * data/pages/PageName/attachments/* -> just copy migration data --help [data-option] This tool allow you to migrate data of pages to a newer version server standalone --help [standalone-option] This tool allows you to start a standalone server xmlrpc mailimport --help [mailimport-option] This tool allows you to import mail into the wiki. xmlrpc remote --help [remote-option] This tool allows you to execute moin scripts remotely. xmlrpc retrieve --help [retrieve-option] This tool allows you to print out the contents of a page via xmlrpc. xmlrpc write --help [write-option] This tool allows you to edit a page with xmlrpc. It is more of a commented example than an actual script. EXAMPLES
Clean the cache containing pre-computed/pre-rendered pages. $ moin --config-dir=/etc/moin --wiki-url=http://webserver/mywiki maint cleancache Manually migrate the wiki content. $ moin --config-dir=/where/your/configdir/is --wiki-url=http://webserver/mywiki migration data Create the initial Xapian index (after enabling it in the configuration file) $ moin --config-dir=/etc/moin --wiki-url=http://webserver/mywiki index build --mode=add SEE ALSO
The full documentation for moin command line is maintained as a Wiki page (HelpOnMoinCommand). A copy is available at /usr/share/doc/python-moinmoin/HelpOnMoinCommand. Read the help page on your running instance of moinmoin because other MoinMoin instances, like http://moinmo.in/HelpOnMoinCommand may run a different version. moin 2010-04-06 MOIN(1)
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