把文件里面的数据批量替换成带有//的数据

把文件目录下面的文件里面的某个内容批量替换成带有//的字符串，例如将当前目录下面的所有文件里面的QMessageBox::替换成//QMessageBox::，使用方法如下:

sed -i "s/QMessageBox::/\/\/QMEssageBox::/g" `grep "QMessageBox::" -rl ./`

命令解析: sed ， -i[SUFFIX], --in-place[=SUFFIX]  edit files in place (makes backup if SUFFIX supplied)

grep解析: -r, --recursive，代表递归; 

-l:  --files-with-matches
              Suppress normal output; instead print the name of each input file from which output would normally have been printed.  The scanning will stop
              on the first match.  (-l is specified by POSIX.)