Environment variables: Difference between revisions
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{{omit from|TI-83 BASIC}} {{omit from|TI-89 BASIC}} <!-- Does not have an environment other than regular global variables. -->▼
Show how to get one of your process's [[wp:Environment variable|environment variables]]. The available variables vary by system; some of the common ones available on Unix include PATH, HOME, USER.▼
{{omit from|M4}}▼
{{omit from|Unlambda|Does not provide access to environment variables.}}▼
{{task|Programming environment operations}}
Show how to get one of your process's [[wp:Environment variable|environment variables]].
▲
=={{header|Ada}}==
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fmt.Println(os.Getenv("SHELL"))
}</lang>
{{out}}
<pre>
/bin/bash
</pre>
;Alternatively:
Library function os.Environ returns all environment variables.
You're on your own then to parse out the one you want.
Example:
<lang go>package main
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fmt.Println(s, "not found")
}</lang>
{{out}}
<pre>
SHELL has value /bin/bash
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stdoutnl(getenv('USER'))
stdoutnl(getenv('WHAT'))</lang>
{{out}}
<pre>/Users/rosetta
/opt/local/bin:/opt/local/sbin:/usr/local/bin/:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/opt/X11/bin
rosetta
</pre>
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}
}</lang>
{{out}}
<pre>llGetTimestamp()=2012-07-18T01:26:12.133137Z
llGetEnergy()=1.230000
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return
</lang>
{{out}}
<pre>
---- Environment "CLASSPATH" ---------------------------------------------------
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print "Default Dir is : ";DefaultDir$</lang>
<pre>
{{out}}
User Info is : Mozilla/5.0 (Windows NT 6.1) AppleWebKit/535.11 (KHTML, like Gecko) Chrome/17.0.963.79 Safari/535.11
Platform is : win32
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=={{header|Scala}}==
{{libheader|Scala}}
<lang scala>object Environment_variables extends App {
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Now child processes launched by the shell will have an environment variable called <code>VAR</code>.
The Unix command "env" will print out all of the environment variables
as key=value pairs on standard output.
=={{header|Ursala}}==
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showenv = <.file$[contents: --<''>]>+ %smP+ ~&n-={'TERM','SHELL','X11BROWSER'}*~+ ~environs</lang>
The rest of this application searches for the three variables named
and displays them on standard output.
Here is a bash session.▼
<pre>
$ showenv
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]</lang>
{{out}}
<pre>
PATH=\masm6;C:\;C:\CXPL;C:\UTIL;C:\DOS;C:\BORLANDC\BIN
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/home/craigd
System.getenv() //--> Dictionary of all env vars</lang>
▲{{omit from|TI-83 BASIC}} {{omit from|TI-89 BASIC}} <!-- Does not have an environment other than regular global variables. -->
▲{{omit from|M4}}
▲{{omit from|Unlambda|Does not provide access to environment variables.}}
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