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copied!<p>Variables inside <code>'</code> don't get substituted in bash. To get string substitution (or interpolation, if you're familiar with perl) you would need to change it to use double quotes <code>"</code> instead of the single quotes:</p> <pre><code>$ # enclose entire expression in double quotes $ sed "s/draw($prev_number;n_)/draw($number;n_)/g" file.txt > tmp $ # or, concatenate strings with only variables inside double quotes $ # this would restrict expansion to relevant portion $ # and prevent accidental expansion for !, backticks, etc $ sed 's/draw('"$prev_number"';n_)/draw('"$number"';n_)/g' file.txt > tmp $ # variable cannot contain arbitrary characters $ # see link in further reading section for details $ a='foo bar' $ echo 'baz' | sed 's/baz/'"$a"'/g' sed: -e expression #1, char 9: unterminated `s' command </code></pre> <p><br></p> <p><strong>Further Reading:</strong></p> <ul> <li><a href="https://stackoverflow.com/questions/6697753/difference-between-single-and-double-quotes-in-bash">Difference between single and double quotes in Bash</a> </li> <li><a href="https://stackoverflow.com/questions/29613304/is-it-possible-to-escape-regex-metacharacters-reliably-with-sed">Is it possible to escape regex metacharacters reliably with sed</a> </li> <li><a href="https://stackoverflow.com/questions/5864146/use-slashes-in-sed-replace">Using different delimiters for sed substitute command</a></li> <li>Unless you need it in a different file you can use the <a href="https://stackoverflow.com/questions/5694228/sed-in-place-flag-that-works-both-on-mac-bsd-and-linux">-i flag to change the file in place</a></li> </ul>

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