第三周作业

1. sed -n '1~2p' /etc/passwd

2.sed -n '2~10p' /etc/passwd | sed 's/bin/linux/g'

3.sed -n '$p' /etc/passwd

4.sed -r 's/^#|[ \t]'//g' /etc/fstab

5.sed -n '1,3w /root/file.txt' /etc/passwd

6.rpm -ivh ntp-0.7.12X86_64.rpm

  rpm -e --nodeps ntp-0.7.12X86_64.rpm

  rpm -uvh ntp-0.7.12X86_64.rpm

7.

rpm -qR openssl.x86.rpm

rpm -ql openssl.x86.rpm

rpm --test openssl.x86.rpm

rpm -qi openssl.x86.rpm

rpm -qf /usr/lib/libssl.so.6

8.

mount -t auto /dev/sr0 /mnt

9.yum list installed redis