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    <h1>The problem</h1> <p>There are two ways for a terminal emulator to send an <kbd>Alt</kbd> key (usually called a Meta key as actual terminals didn't have Alt). It can either send 8 bit characters and set the high bit when Alt is used, or it can use escape sequences, sending <kbd>Alt-a</kbd> as <code>&lt;Esc&gt;a</code>. Vim expects to see the 8 bit encoding rather than the escape sequence.</p> <p>Some terminal emulators such as <em>xterm</em> can be set to use either mode, but <em>Gnome terminal</em> doesn't offer any such setting. To be honest in these days of Unicode editing, the 8-bit encoding is not such a good idea anyway. But escape sequences are not problem free either; they offer no way of distinguishing between <code>&lt;Esc&gt;j</code> meaning <kbd>Alt-j</kbd> vs pressing <kbd>Esc</kbd> followed by <kbd>j</kbd>.</p> <p>In earlier terminal use, typing <kbd>Esc</kbd><kbd>j</kbd> was another way to send a Meta on a keyboard without a <kbd>Meta</kbd> key, but this doesn't fit well with vi's use of Esc to leave <em>insert</em> mode.</p> <h1>The solution</h1> <p>It is possible to work around this by configuring vim to map the escape sequences to their Alt combinations.</p> <p>Add this to your .vimrc:</p> <pre><code>let c='a' while c &lt;= 'z' exec "set &lt;A-".c."&gt;=\e".c exec "imap \e".c." &lt;A-".c."&gt;" let c = nr2char(1+char2nr(c)) endw set timeout ttimeoutlen=50 </code></pre> <p>Alt-letter will now be recognised by vi in a terminal as well as by gvim. The <code>timeout</code> settings are used to work around the ambiguity with escape sequences. <kbd>Esc</kbd> and <kbd>j</kbd> sent within 50ms will be mapped to <code>&lt;A-j&gt;</code>, greater than 50ms will count as separate keys. That should be enough time to distinguish between Meta encoding and hitting two keys.</p> <p>If you don't like having timout set, which times out for other mapped key sequences (after a second by default), then you can use <code>ttimeout</code> instead. ttimeout applies only to key codes and not other mappings.</p> <pre><code>set ttimeout ttimeoutlen=50 </code></pre>
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    1. POAlt key shortcuts not working on gnome terminal with Vim
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    1. COThank you so much for this! You finally fixed a problem that's been bothering me for so long!
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      1. USEli Gundry
    2. COHow to modify it for <A-L>? I mean - for uppercase keys?
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      1. USArnis Lapsa
    3. COChange the let to 'A' and the while condition to 'Z' to map upper case keys. Do both if you want.
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