binutils和其他工具网址规格严格

1，http://www.gnu.org/software/binutils/

2，http://stackoverflow.com/questions/1439799/how-can-i-get-the-source-code-for-the-linux-utility-tail

3，http://www.freebsd.org/cgi/cvsweb.cgi/src/usr.bin/tail/#dirlist

4，http://www.koders.com/c/fid8DEE98A42C35A1346FA89C328CC3BF94E25CF377.aspx