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>System.Posix.Env</TITLE
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>unix-2.3.2.0: POSIX functionality</TD
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><A HREF="index.html"
>Contents</A
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>System.Posix.Env</FONT
></TD
><TD ALIGN="right"
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><TD CLASS="infohead"
>Portability</TD
><TD CLASS="infoval"
>non-portable (requires POSIX)</TD
></TR
><TR
><TD CLASS="infohead"
>Stability</TD
><TD CLASS="infoval"
>provisional</TD
></TR
><TR
><TD CLASS="infohead"
>Maintainer</TD
><TD CLASS="infoval"
>libraries@haskell.org</TD
></TR
></TABLE
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section1"
>Description</TD
></TR
><TR
><TD CLASS="doc"
>POSIX environment support
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section1"
>Synopsis</TD
></TR
><TR
><TD CLASS="s15"
></TD
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><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="decl"
><A HREF="#v%3AgetEnv"
>getEnv</A
> :: <A HREF="../base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="../base/System-IO.html#t%3AIO"
>IO</A
> (<A HREF="../base/Data-Maybe.html#t%3AMaybe"
>Maybe</A
> <A HREF="../base/Data-Char.html#t%3AString"
>String</A
>)</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AgetEnvDefault"
>getEnvDefault</A
> :: <A HREF="../base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="../base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="../base/System-IO.html#t%3AIO"
>IO</A
> <A HREF="../base/Data-Char.html#t%3AString"
>String</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AgetEnvironmentPrim"
>getEnvironmentPrim</A
> :: <A HREF="../base/System-IO.html#t%3AIO"
>IO</A
> [<A HREF="../base/Data-Char.html#t%3AString"
>String</A
>]</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AgetEnvironment"
>getEnvironment</A
> :: <A HREF="../base/System-IO.html#t%3AIO"
>IO</A
> [(<A HREF="../base/Data-Char.html#t%3AString"
>String</A
>, <A HREF="../base/Data-Char.html#t%3AString"
>String</A
>)]</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AputEnv"
>putEnv</A
> :: <A HREF="../base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="../base/System-IO.html#t%3AIO"
>IO</A
> <A HREF="../ghc-prim/GHC-Unit.html#t%3A%28%29"
>()</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AsetEnv"
>setEnv</A
> :: <A HREF="../base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="../base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="../ghc-prim/GHC-Bool.html#t%3ABool"
>Bool</A
> -&gt; <A HREF="../base/System-IO.html#t%3AIO"
>IO</A
> <A HREF="../ghc-prim/GHC-Unit.html#t%3A%28%29"
>()</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AunsetEnv"
>unsetEnv</A
> :: <A HREF="../base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="../base/System-IO.html#t%3AIO"
>IO</A
> <A HREF="../ghc-prim/GHC-Unit.html#t%3A%28%29"
>()</A
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section1"
>Documentation</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:getEnv"
><A NAME="v%3AgetEnv"
></A
></A
><B
>getEnv</B
> :: <A HREF="../base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="../base/System-IO.html#t%3AIO"
>IO</A
> (<A HREF="../base/Data-Maybe.html#t%3AMaybe"
>Maybe</A
> <A HREF="../base/Data-Char.html#t%3AString"
>String</A
>)</TD
></TR
><TR
><TD CLASS="doc"
><TT
><A HREF="System-Posix-Env.html#v%3AgetEnv"
>getEnv</A
></TT
> looks up a variable in the environment.
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:getEnvDefault"
><A NAME="v%3AgetEnvDefault"
></A
></A
><B
>getEnvDefault</B
> :: <A HREF="../base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="../base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="../base/System-IO.html#t%3AIO"
>IO</A
> <A HREF="../base/Data-Char.html#t%3AString"
>String</A
></TD
></TR
><TR
><TD CLASS="doc"
><TT
><A HREF="System-Posix-Env.html#v%3AgetEnvDefault"
>getEnvDefault</A
></TT
> is a wrapper around <TT
><A HREF="System-Posix-Env.html#v%3AgetEnv"
>getEnv</A
></TT
> where the
 programmer can specify a fallback if the variable is not found
 in the environment.
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:getEnvironmentPrim"
><A NAME="v%3AgetEnvironmentPrim"
></A
></A
><B
>getEnvironmentPrim</B
> :: <A HREF="../base/System-IO.html#t%3AIO"
>IO</A
> [<A HREF="../base/Data-Char.html#t%3AString"
>String</A
>]</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:getEnvironment"
><A NAME="v%3AgetEnvironment"
></A
></A
><B
>getEnvironment</B
> :: <A HREF="../base/System-IO.html#t%3AIO"
>IO</A
> [(<A HREF="../base/Data-Char.html#t%3AString"
>String</A
>, <A HREF="../base/Data-Char.html#t%3AString"
>String</A
>)]</TD
></TR
><TR
><TD CLASS="doc"
><TT
><A HREF="System-Posix-Env.html#v%3AgetEnvironment"
>getEnvironment</A
></TT
> retrieves the entire environment as a
 list of <TT
>(key,value)</TT
> pairs.
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:putEnv"
><A NAME="v%3AputEnv"
></A
></A
><B
>putEnv</B
> :: <A HREF="../base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="../base/System-IO.html#t%3AIO"
>IO</A
> <A HREF="../ghc-prim/GHC-Unit.html#t%3A%28%29"
>()</A
></TD
></TR
><TR
><TD CLASS="doc"
><TT
><A HREF="System-Posix-Env.html#v%3AputEnv"
>putEnv</A
></TT
> function takes an argument of the form <TT
>name=value</TT
>
 and is equivalent to <TT
>setEnv(key,value,True{-overwrite-})</TT
>.
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:setEnv"
><A NAME="v%3AsetEnv"
></A
></A
><B
>setEnv</B
> :: <A HREF="../base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="../base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="../ghc-prim/GHC-Bool.html#t%3ABool"
>Bool</A
> -&gt; <A HREF="../base/System-IO.html#t%3AIO"
>IO</A
> <A HREF="../ghc-prim/GHC-Unit.html#t%3A%28%29"
>()</A
></TD
></TR
><TR
><TD CLASS="doc"
>The <TT
><A HREF="System-Posix-Env.html#v%3AsetEnv"
>setEnv</A
></TT
> function inserts or resets the environment variable name in
     the current environment list.  If the variable <TT
>name</TT
> does not exist in the
     list, it is inserted with the given value.  If the variable does exist,
     the argument <TT
>overwrite</TT
> is tested; if <TT
>overwrite</TT
> is <TT
>False</TT
>, the variable is
     not reset, otherwise it is reset to the given value.
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:unsetEnv"
><A NAME="v%3AunsetEnv"
></A
></A
><B
>unsetEnv</B
> :: <A HREF="../base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="../base/System-IO.html#t%3AIO"
>IO</A
> <A HREF="../ghc-prim/GHC-Unit.html#t%3A%28%29"
>()</A
></TD
></TR
><TR
><TD CLASS="doc"
>The <TT
><A HREF="System-Posix-Env.html#v%3AunsetEnv"
>unsetEnv</A
></TT
> function deletes all instances of the variable name
 from the environment.
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
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>Produced by <A HREF="http://www.haskell.org/haddock/"
>Haddock</A
> version 2.4.2</TD
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