使用shell搜索匹配文件

ACTIONS
   -exec command ;
    Execute command; true if 0 status is returned.  All following arguments to find are taken to be arguments to the command until an argument consisting of `;' is encountered.  The string `{}' is replaced by the current file name being processed everywhere it occurs in the arguments  to  the  command, not just in arguments where it is alone, as in some versions of find.  Both of these constructions might need to be escaped (with a `\') or quoted to protect them from expansion by the shell.  See the EXAMPLES section for examples of the use of the -exec option.  The specified command is  run  once for  each  matched  file.   The command is executed in the starting directory.   There are unavoidable security problems surrounding use of the -exec action; you should use the -execdir option instead.

find ./ -name "*.php" -exec grep "system" {} \;

find ./ -name "*.php" -exec grep -l "system" {} \;