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    <p>You can't use awk and read and write from the same file (is part of your problem).</p> <p>I prefer to rename the file before I rewrite (but you can save to a tmp and then rename too).</p> <pre><code>/bin/mv file file.tmp awk '.... code ...' file.tmp &gt; file </code></pre> <p>If your env file gets bigger, you'll see that is is getting truncated at the buffer size of your OS.</p> <p>Also, don't forget that gawk (the std on most Linux installations) has a built in array ENVIRON. You can create what you want from that</p> <pre><code>awk 'END { for (key in ENVIRON) { print key "=" ENVIRON[key] } }' /dev/null </code></pre> <p>Of course you get everything in your environment, so maybe more than you want. But probably a better place to start with what you are trying to accomplish.</p> <p><strong>Edit</strong> Most specifically</p> <pre><code> awk -F"=" '{ if ($1 in ENVIRON) { printf("%s=%s\n", $1, ENVIRON[$1]) } # else line not printed or add code to meet your situation }' file &gt; file.tmp /bin/mv file.tmp file </code></pre> <p><strong>Edit 2</strong> I think your var=values might need to be <code>export</code> -ed so they are visible to the awk ENVIRON array.</p> <p>AND</p> <pre><code>echo PATH=xxx| awk -F= '{print ENVIRON[$1]}' </code></pre> <p>prints the existing value of PATH.</p> <p>I hope this helps.</p> <p>P.S. as you appear to be a new user, if you get an answer that helps you please remember to mark it as accepted, and/or give it a + (or -) as a useful answer.</p>
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    1. POSubstituting environment variables in a file: awk or sed?
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    1. COThanks for having a shot, but again I don't think I've made myself clear. Is there a sh/sed/awk equivalent of: perl -ne '/^([^=]+)/; print "$1=$ENV{$1}\n";'?
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    2. COThanks again. Your edit seems to be more like what I'm after, however the ENVIRON[$1] statement doesn't expand properly. Are you able to double-check that?
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