Work on the machine :
1 , please find out with the command ifconfig absolute path command program
[root@localhost ~]# which ifconfig
/usr/sbin/ifconfig
2 , please use the following command to display the command which is an internal command, which is an external command ? (Cd \ pwd \ ls \ ifconfig \ du)
[root@localhost ~]# type cd
cd is a shell built ( we can see the command cd internal command )
[root@localhost ~]# type pwd
pwd is a shell built ( we can see the command cd internal command )
[root@localhost ~]# type ls
ls is `ls --color = auto ' aliases
[root@localhost ~]# type ifconfig
ifconfig 是 /usr/sbin/ifconfig
[root@localhost ~]# type du
du has been hashed (/ usr / bin / du)
3, please in / create directory abc
[root@localhost ~]# mkdir /abc
Please / Create a directory / liangjian / liyunlong / weiheshang / duanpeng
[Root @ localhost ~] # mkdir -pv / liangjian / liyunlong / weiheshang / duanpeng
mkdir: we have created the directory "/ liangjian"
mkdir: it has created the directory "/ liangjian / liyunlong"
mkdir: you have created the directory "/ liangjian / liyunlong / weiheshang"
mkdir: you have created the directory "/ liangjian / liyunlong / weiheshang / duanpeng"
Please / abc first created under the 1000 directory, to develop their own name.
[root@localhost ~]# cd /abc
[root@localhost abc]# mkdir -pv a{1..1000}
mkdir: has been created directory "a1"
mkdir: has been created directory "a2"
mkdir: has been created directory "a3"
mkdir: has been created directory "a4"
mkdir: has been created directory "a5"
mkdir: has been created directory "a6"
4 , a switch to mode absolute path / liangjian / liyunlong / weiheshang / duanpeng directory
And with pwd view the current path, with the name of the parent directory ".." to switch to the mode / liangjian / liyunlong down
[root@localhost abc]# cd
[Root @ localhost ~] # cd / liangjian / liyunlong / weiheshang / duanpeng
[root@localhost duanpeng]# pwd
/ Liangjian / liyunlong / weiheshang / duanpeng
[Root @ localhost duanpeng] # cd / liangjian / liyunlong
[root@localhost liyunlong]#
5 , delete the first / abc next time you create a 1000 directory, in the / abc case with touch and then create 20 Ge to stu beginning of ordinary readable document, the document suffix .txt
[root@localhost liyunlong]# cd /abc
[root@localhost abc]# rm -rf a{1..1000}
[root@localhost abc]# touch stu{1..20}.txt
[root@localhost abc]# ls
stu10.txt stu2.txt
stu11.txt stu3.txt
stu12.txt stu4.txt
stu13.txt stu5.txt
stu14.txt stu6.txt
stu15.txt stu7.txt
stu16.txt stu8.txt
stu17.txt stu9.txt
stu18.txt stu19.txt
stu1.txt stu20.txt
6 , please use the cp command / boot / directory to vmlinuz files are copied to the beginning / abc lower, and to see the size of the disk space they occupy.
[root@localhost ~]# cp -fr /boot/vmlinuz* /abc
[root@localhost ~]# cd /abc
[root@localhost abc]# ls
stu10.txt stu2.txt
stu11.txt stu3.txt
stu12.txt stu4.txt
stu13.txt stu5.txt
stu14.txt stu6.txt
stu15.txt stu7.txt
stu16.txt stu8.txt
stu17.txt stu9.txt
stu18.txt vmlinuz
stu19.txt vmlinuz-0-rescue-1781126a035244acbfb57d3f9b9955cf
stu1.txt vmlinuz-3.10.0-229.el7.x86_64
stu20.txt
[root@localhost abc]# du -sh
9.6M.
7 , in which a vmlinuz beginning of the file is renamed KGC , a further cut to / tmp directory.
[root@localhost abc]# mv vmlinuz-0-rescue-1781126a035244acbfb57d3f9b9955cf kgc
[root@localhost abc]# ls
kgc stu15.txt stu20.txt stu7.txt
stu10.txt stu16.txt stu2.txt stu8.txt
stu11.txt stu17.txt stu3.txt stu9.txt
stu12.txt stu18.txt stu4.txt vmlinuz
stu13.txt stu19.txt stu5.txt vmlinuz-3.10.0-229.el7.x86_64
stu14.txt stu1.txt stu6.txt
[root@localhost abc]# cd
[root@localhost ~]# mv /abc/vmlinuz-3.10.0-229.el7.x86_64 /tmp
[root@localhost ~]# cd /tmp
[root@localhost tmp]# ls
hsperfdata_root systemd-private-PBSqBr
ks-script-4BkH3y systemd-private-QWHDdE
ssh-6Mdsp0Wi2oLf systemd-private-rVPz0P
ssh-IZ3FITvrrrrS systemd-private-tpQOLh
ssh-jI1uHRAhmWSu systemd-private-x0D2yP
ssh-SRTlh3lLi9Yq systemd-private-Z2SRR1
systemd-private-6sN7gJ systemd-private-zqFTlU
systemd-private-8f5azw vmlinuz-3.10.0-229.el7.x86_64
systemd-private-GpNskW vmware-root
systemd-private-Ip1Y8f yum.log
systemd-private-KaqASR yum_save_tx.2019-07-23.19-03.Eoc23z.yumtx
8 , see the / tmp / to the directory vmlinuz detail beginning of the file status information.
[root@localhost tmp]# stat vmlinuz*
File: "vmlinuz-3.10.0-229.el7.x86_64"
Size: 5029136 block: 9824 IO block: 4096 regular file
Equipment: fd00h / 64768d Inode : 75,476,714 hard link: 1
Permissions: (0755 / XR--rwxr-X) Uid : (0 / the root) Gid : (0 / the root)
环境：unconfined_u:object_r:default_t:s0
Last Visit: 2019-07-2320: 59: 48.467156144 +0800
Recent changes: 2019-07-2320: 59: 48.480156188 +0800
Recent changes: 2019-07-2321: 08: 06.843825517 +0800
Created: -
[root@localhost tmp]#
9 , with find find command / tmp to directory vmlinuz beginning and larger than 1M file
[root@localhost tmp]# find -name "vmlinuz*" -a -size +1M
./vmlinuz-3.10.0-229.el7.x86_64