Linux Three Musketeers Dick-sed

1, find and replace

[email protected] oldboy]# cat Test.txt
Oldboy
[[Email protected] oldboy]# sed ' s#oldboy#gongli#g ' test.txt #me: Just modified the output, the original file did not change
Gongli

#me: s---Replace, g--global Replace, n--cancel default output, p--print required, e--edit

#me: If the replaced content is empty, it is cut and can be used to intercept the function.

[[email protected] oldboy]# sed-i ' s#oldboy#gongli#g ' test.txt #me:-I parameter is directly modified file
[email protected] oldboy]# cat Test.txt
Gongli

2, when the regular replacement, the space is represented by \s

Linux Three Musketeers Dick-sed