作业rhcsa

1.

head -6 /etc/passwd |tail -1

 2.(1)

grep ^[A-Z] /

(2)

grep ^[host] /etc

(3)

grep "HOME$" /etc

(4)

grep -i "a.txt" /

3.

grep "re" /usr/share/rhel.xml >> /root/files

4.

tar -czf /back/etcback.tar.gz /etc

5.

vim .bashrc

alias hello="echo 'hello,everyone'>>/file.txt"

6.

gruopadd mygruop
useradd myuser
gpasswd -a myuser mygroup
su myuser
mkdir /home/myuser/ex
mkdir /home/myuser/hv
chown root:root hv

7.

groupadd g1
useradd redhat
touch redhat.txt
chown redhat:g1 redhat.txt