To set GRUB timeout to 5 seconds, use this command.
<pre><code class="lang-bash">sed -i.bak 's/timeout=5/timeout=5/g' /boot/grub/grub.cfg
</code></pre>
To disable timeout (first option will be selected automatically) use this
command.
<pre><code class="lang-bash">sed -i.bak 's/timeout=5/timeout=0/g' /boot/grub/grub.cfg
</code></pre>
To halt boot menu until any option is selected, use this one.
<pre><code class="lang-bash">sed -i.bak 's/timeout=5/timeout=-1/g' /boot/grub/grub.cfg
</code></pre>
If you want to disable creating backup, remove .bak from sed's option. For
examlple,
<pre><code class="lang-bash">sed -i 's/timeout=5/timeout=1/g' /boot/grub/grub.cfg
</code></pre>


To set GRUB timeout to 5 seconds, use this command.

```bash
sed -i.bak 's/timeout=5/timeout=5/g' /boot/grub/grub.cfg
```

To disable timeout (first option will be selected automatically) use this
command.
```bash
sed -i.bak 's/timeout=5/timeout=0/g' /boot/grub/grub.cfg
```

To halt boot menu until any option is selected, use this one.

```bash
sed -i.bak 's/timeout=5/timeout=-1/g' /boot/grub/grub.cfg
```

If you want to disable creating backup, remove .bak from sed's option. For
examlple,

```bash
sed -i 's/timeout=5/timeout=1/g' /boot/grub/grub.cfg
```

Minhaz's Blog

Minhaz's Blog

Bash One-liner to Set GRUB Timeout