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    <p>You can replace the single quotes in the sed command with double-quoted single quotes. The shell sees a single quote as ending a string. So, let it. You had</p> <pre><code>sed -i 's/'ADMIN_USERNAME','memcache'/'ADMIN_USERNAME','u'/g' /var/www/html/memcache.php </code></pre> <p>But, if you replace the ' in the sed command with '"'"', then shell will see the first ' as ending the first single-quoted string, then "'" as a double-quoted single quote, and then the last ' as a beginning of a new single-quoted string. That'd be</p> <pre><code>sed -i 's/'"'"'ADMIN_USERNAME'"'"','"'"'memcache'"'"'/'"'"'ADMIN_USERNAME'"'"','"'"'u'"'"'/g' /var/www/html/memcache.php </code></pre> <p>You should also be able to do '\'' in place of the ' within the command, for the same reason.</p> <pre><code>sed -i 's/'\''ADMIN_USERNAME\'',\''memcache\''/\''ADMIN_USERNAME\'',\''u\''/g' /var/www/html/memcache.php </code></pre> <p>But really, it'd be better to use an alternative mechanism. I'd suggest defining the source and target strings as variables, and then put those in the sed string.</p> <pre><code>SRC="'ADMIN_USERNAME','memcache'" DST="'ADMIN_USERNAME','u'" sed -i "s/$SRC/$DST/g" /var/www/html/memcache.php </code></pre> <p>That's way more readable, and it makes it easier for you to handle the quoting mess in a sane way with bite-sized chunks. Yay "shell variable contents aren't subject to word expansion unless you force it" knowledge. :)</p> <p>Make sure you don't put a / in the $SRC or $DST variables, though. ;)</p>
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