作业一
mkdir study
touch study/WETOS_class{1,2}_linux{1..6}
mkdir /tmp/VERSION
touch redhat_version{1..8} ./tmp/VERSION
cp ./tmp/VERSION redhat_version{1,3,5,7} ./SINFLE
cp ./tmp/VERSION redhat_version{2,4,6,8} ./DOUBLE
mv ./study/*class1* CLASS1
mv ./study/*class2* CLASS2
cp /etc/*[[:digit:]]*.conf confdir
rm -fr *
作业二
date "+%:H%:M%:S" >time.txt
head -n 18 /etc/passwd |tail -n 3
find ./bin/*[[:upper:]]*|tee bin_westos_fine.txt|wc -l
find /etc/ -name passwd >
find /etc/ -name passwd 1>/tmp/westos.out 2>/tmp/westos.err
find /etc/ -name passwd 2>&1 |tee /tmp/passwd