sed 匹配结果计算后修改到文件

# cat file 
ello 
barbaz?cache_version=4fooooo
bye

# sed -i -r 's/(.*)(?cache_version=)([0-9]+)(.*)/echo "12$((3+1))4"/ge' file 
# cat file 
ello 
barbaz?cache_version=5fooooo
bye

# 传递外部变量

#cache="cache_version="

#sed -i -r 's/(.*)(?'$cache')([0-9]+)(.*)/echo "12$((3+1))4"/ge' file 

# cat file 
ello 
barbaz?cache_version=6fooooo
bye

参考：

https://stackoverflow.com/questions/14348432/how-to-find-replace-and-increment-a-matched-number-with-sed-awk