/usr/libexec/grepconf.sh: line 5: grep: command not found

[root@usdt01 ~]# source /etc/profile
bash: tty: command not found
/usr/libexec/grepconf.sh: line 5: grep: command not found

执行export PATH=/usr/bin:/usr/sbin:/bin:/sbin:/usr/X11R6/bin后再source