sed 搜索并替换

find . -type f -exec sed -i "s/std=c++11/std=c++14/g" {} \;

搜索当前目录下的文件，把std=c++11替换成std=c++14，注意{}和\之间有个空格。

全词替换

$ echo "bar embarassment" | sed "s/\bbar\b/no bar/g"
no bar embarassment

\b in regular expressions match word boundaries (i.e. the location between the first word character and non-word character):