There are 2 pages involved. The first is a form that passes the value $newvalue to the CGI script. The CGI script receives that value fine and I can dump it to screen fine.
If I try and write that value to the config file one of two things happens. Firstly, if I single quote the value '$newvalue' it will write the literal string $newvalue to the config file. So this rules out any permissions issues with writing to the file.
Any other format ("$newvalue" or \$newvalue) will not write to the file at all. It simply ignores it.
If I set the variable value myself in the CGI script (that is, not pass it from a form) and then try and write that value to the file it works.
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