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    <p>You're not going to be able to modify the caller's shell because it's in a different process context. When child processes inherit your shell's variables, they're inheriting copies themselves.</p> <p>One thing you can do is to write a script that emits the correct commands for tcsh or sh based how it's invoked. If you're script is "setit" then do:</p> <pre><code>ln -s setit setit-sh </code></pre> <p>and</p> <pre><code>ln -s setit setit-csh </code></pre> <p>Now either directly or in an alias, you do this from sh</p> <pre><code>eval `setit-sh` </code></pre> <p>or this from csh</p> <pre><code>eval `setit-csh` </code></pre> <p>setit uses $0 to determine its output style.</p> <p>This is reminescent of how people use to get the TERM environment variable set.</p> <p>The advantage here is that setit is just written in whichever shell you like as in:</p> <pre><code>#!/bin/bash arg0=$0 arg0=${arg0##*/} for nv in \ NAME1=VALUE1 \ NAME2=VALUE2 do if [ x$arg0 = xsetit-sh ]; then echo 'export '$nv' ;' elif [ x$arg0 = xsetit-csh ]; then echo 'setenv '${nv%%=*}' '${nv##*=}' ;' fi done </code></pre> <p>with the symbolic links given above, and the eval of the backquoted expression, this has the desired result.</p> <p>To simplify invocation for csh, tcsh, or similar shells:</p> <pre><code>alias dosetit 'eval `setit-csh`' </code></pre> <p>or for sh, bash, and the like:</p> <pre><code>alias dosetit='eval `setit-sh`' </code></pre> <p>One nice thing about this is that you only have to maintain the list in one place. In theory you could even stick the list in a file and put <code>cat nvpairfilename</code> between "in" and "do".</p> <p>This is pretty much how login shell terminal settings used to be done: a script would output statments to be executed in the login shell. An alias would generally be used to make invocation simple, as in "tset vt100". As mentioned in another answer, there is also similar functionality in the INN UseNet news server.</p>
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    1. POCan a shell script set environment variables of the calling shell?
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    1. USThomas Kammeyer
    1. USThomas Kammeyer
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    1. COI think this might be on the right track. But I don't quite know what should be in 'setit' that will allow it to run correctly from either shell. Can you spell out a little more what you had in mind?
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      1. USLarry Gritz
    2. COBasically, it would check $0 and move into the appropriate part of the script based on what name it was called with.
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      1. USphresus
    3. COI think what Thomas is saying, you write the `setit` script in one language, but it then outputs a language specific set of instructions that must be `eval'd` by the calling process.
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