This is a short bit of code to show how you can use perl to change the title of your xterm on the fly. It works with Tera Term as well, and probably others.
#!/usr/bin/perl -w
use strict;

print("\e]0;@ARGV\7");

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That simple program will change the icon and title to the arguments from the command line.

The important part is the "\e]0" and "\7". The first tells the terminal that the following text is meant to be the title. The \7 terminates the title string. Also "\e]1" sets only the icon name, and "\e]2" sets only the title.

In reply to How to change an xterm title on the fly by suaveant

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