请使用命令行展开功能来完成以下练习： (1)、创建/tmp目录下的：a_c, a_d, b_c, b_d (2)、创建/tmp/mylinux目录下的：

（1)

[yangyangyang@localhost ~]$ mkdir -pv /tmp/{a,b}_{c,d}

mkdir: created directory ‘/tmp/a_c’
mkdir: created directory ‘/tmp/a_d’
mkdir: created directory ‘/tmp/b_c’
mkdir: created directory ‘/tmp/b_d’

(2)

[yangyangyang@localhost ~]$ mkdir -pv /tmp/mylinux/{bin,boot/grub,dev,etc/{rc.d/init.d,sysconfig/network-scripts},lib/modules,lib64,proc,sbin,sys,tmp,usr/local/{bin,sbin},var/{lock,log,run}}
mkdir: created directory ‘/tmp/mylinux’
mkdir: created directory ‘/tmp/mylinux/bin’
mkdir: created directory ‘/tmp/mylinux/boot’
mkdir: created directory ‘/tmp/mylinux/boot/grub’
mkdir: created directory ‘/tmp/mylinux/dev’
mkdir: created directory ‘/tmp/mylinux/etc’
mkdir: created directory ‘/tmp/mylinux/etc/rc.d’
mkdir: created directory ‘/tmp/mylinux/etc/rc.d/init.d’
mkdir: created directory ‘/tmp/mylinux/etc/sysconfig’
mkdir: created directory ‘/tmp/mylinux/etc/sysconfig/network-scripts’
mkdir: created directory ‘/tmp/mylinux/lib’
mkdir: created directory ‘/tmp/mylinux/lib/modules’
mkdir: created directory ‘/tmp/mylinux/lib64’
mkdir: created directory ‘/tmp/mylinux/proc’
mkdir: created directory ‘/tmp/mylinux/sbin’
mkdir: created directory ‘/tmp/mylinux/sys’
mkdir: created directory ‘/tmp/mylinux/tmp’
mkdir: created directory ‘/tmp/mylinux/usr’
mkdir: created directory ‘/tmp/mylinux/usr/local’
mkdir: created directory ‘/tmp/mylinux/usr/local/bin’
mkdir: created directory ‘/tmp/mylinux/usr/local/sbin’
mkdir: created directory ‘/tmp/mylinux/var’
mkdir: created directory ‘/tmp/mylinux/var/lock’
mkdir: created directory ‘/tmp/mylinux/var/log’
mkdir: created directory ‘/tmp/mylinux/var/run’

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请使用命令行展开功能来完成以下练习： (1)、创建/tmp目录下的：a_c, a_d, b_c, b_d (2)、创建/tmp/mylinux目录下的：

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