shell命令统计代码行数

wc -- word, line, character, and byte count
The following options are available:

 -c      The number of bytes in each input file is written to the standard
         output.  This will cancel out any prior usage of the -m option.

 -l      The number of lines in each input file is written to the standard
         output.

 -m      The number of characters in each input file is written to the
         standard output.  If the current locale does not support multi-
         byte characters, this is equivalent to the -c option.  This will
         cancel out any prior usage of the -c option.

 -w      The number of words in each input file is written to the standard
         output.

1、当前文件夹下的js文件数
find . -name ".js"|wc -l
2、当前文件夹下的js文件的代码行数
find . -name ".js"|xargs cat|wc -l
3、当前文件夹下的js文件去除空行之后的代码行数
grep -v ^$去除空行
find . -name "*.js"|xargs cat|grep -v ^$|wc -l