linux sed 变量替换,用bash变量替换SED

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我是靠谱客的博主听话樱桃，最近开发中收集的这篇文章主要介绍linux sed 变量替换,用bash变量替换SED，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

内部变量'不要被取代。要获得字符串替换(或者内插法，如果您熟悉Perl)，需要将其更改为使用双引号"而不是单引号：$ # 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

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