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    <p>I guess the best way would be to use augeas, which is a great tool. With augeas you can parse configuration files automatically, append/delete/update some field with XPATH, which is used to navigate through the XML.</p> <p>You can find all the supported conifiguration files that augeas can correctly parse in the following directory:</p> <pre><code>/usr/share/augeas/lenses/dist/ </code></pre> <p>One of the files is fstab.aug, which is the one you want. You don't actually need to do anything with that files, it's just there to let you know that augeas can do what you want :).</p> <pre><code># ls /usr/share/augeas/lenses/dist/fstab.aug /usr/share/augeas/lenses/dist/fstab.aug </code></pre> <p>You can also look here for more detailed example obout changing /etc/fstab through augeas.</p> <p><a href="http://mrpointy.wordpress.com/2010/05/01/augeas-and-appending-lines-to-etcfstab/" rel="nofollow">Augeas Example</a></p> <p>I guess you can use something like the following:</p> <pre><code># augtool augtool&gt; set /files/etc/fstab/1[file='/']/opt[1] "acl" augtool&gt; set /files/etc/fstab/1[file='/']/opt[2] "errors=remount-ro" augtool&gt; print /files/etc/fstab/1 /files/etc/fstab/1 /files/etc/fstab/1/spec = "/dev/mapper/system" /files/etc/fstab/1/file = "/" /files/etc/fstab/1/vfstype = "ext3" /files/etc/fstab/1/opt[1] = "acl" /files/etc/fstab/1/opt[2] = "errors=remount-ro" /files/etc/fstab/1/dump = "0" /files/etc/fstab/1/passno = "1" augtool&gt; save </code></pre> <p>If you want to use augeas in a shell script you can just preced the above commands with augtool keyword, so if you want to change the first 'opt' to 'acl' you would do: </p> <pre><code>augtool set /files/etc/fstab/1[file='/']/opt[1] "acl" augtool set /files/etc/fstab/1[file='/']/opt[2] "errors=remount-ro" augtool save </code></pre> <p>Look at the original augeas page for more: <a href="http://augeas.net" rel="nofollow">Augeas Homepage</a></p>
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    1. POUsing sed to change /etc/fstab
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    1. COThis might be a a good solution but don't need this 3rd party software. My installer needs `acl`- that's the only thing I want to do. Therefore additional software is overkill.
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    2. COIt is the best solution available. And as you need to install sed, you also need to install augeas (but with most distributions sed is already installed, that's why you think it's already there, I don't need to install another software). Fine, use sed, it works, but it's not the best solution.
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    3. CO@eleanor This is way overkill for something as simple as the OP's question. This is the kind of stuff `awk` was made for as it has the notion of fields and regular expressions.
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