Almost every command tells me such as below. What's the problem to my build system? # ls Usage: ls 0123456SsQqAaBbCcUu # ps Usage: ps 0123456SsQqAaBbCcUu Boo Geum Jung Senior Member of Research Staff, Network SW Platform Team, Internet Technology Laboratory, ETRI 161 Kajong-Dong, Yusong-Gu Taejon, Korea, 305-350 bgjung at etri.re.kr +82-42-860-5315