一年多没用了，全忘了：

i need a command line script to do the following: convert line:

//#define LINUX

to line:

#define LINUX

in a file. Let's say this file is test.cpp, what i want is:

sed -e ?/?/g test.cpp

I forget how to express space and hash in sed liao...

谢谢！

something like this for your case.

sed '/^\/\/#/s/\/\// /g' test_sed

replace all the pattern of "//" with " " in those lines which starts with "\\#" .