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Operating Systems AIX Undestanding LANG setting in /etc/environment Post 302778219 by Don Cragun on Sunday 10th of March 2013 06:08:01 AM
Old 03-10-2013
Quote:
Originally Posted by bakunin
There are many AIX facilities which are represented differently in various cultures. Language (of the man pages, of command status output, ...), how numbers are represented, keyboard layout and many other things. All this is controlled by some environment variables of which "LANG" is one (and probably the most important). Issue the "set" command and you will see "LANG", but probably also "LC_MESSAGES" and a few others.

It is possible to control this "language environment" for every process separately, simply by setting the language variable to a different value upon process start, like this:

Code:
# (export LANG=<some_value> ; command)

Now for the role of "/etc/environment": as you have issued "set" you sure have noticed there are a lot of variables assigned. Most of these variables are not set explicitly by you, but get assigned default values. These system-wide default values are stored in "/etc/environment". Have a look at it, it is a simple text file with declarations in the form

Code:
# comment line
variable=value

Every time you log in your environment initially gets filled with these defaults. After this your own changes to the environment are being applied and you can change and override any of these defaults. You certainly have a special user for the program you are talking about. If you depend on the LANG variable to have a certain value it is a wise idea to explicitly set it in your startup scripts ("~/.profile") even if it is to the same value as the default. Even if the default changes your environment will remain as it is. I suggest to add a line

Code:
LANG=C ; export LANG

to your profile or shell startup script. The "export" keyword will make sure every process started from this process inherits this setting. Btw.: the same is true for other environment settings one of your programs depend on. Set these explicitly, even if it is to the same value the variable already has. When the default changes you avoid possible problems.

I hope this helps.

bakunin
Setting LANG=C will do what Aaron Boyce wants only if neither LC_ALL nor LC_NUMERIC is set in the environment. LC_NUMERIC will override LANG for purposes of determining the radix character used and the formatting of numeric output. LC_ALL will override both LANG and LC_NUMERIC.

If LC_NUMERIC is effectively set to a value that sets non-null thousands separators or that uses comma as the radix character, you need to take extra precautions when working with CSV files that contain numeric strings that represent non-integral values, or integral values greater than 999 or less than -999.
 

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