Work on the machine:
1 , please use the command ifconfig find out the absolute path of the 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
[root@localhost ~]# type ls
ls is `ls --color = auto 'aliases
[root@localhost ~]# type ifconfig
ifconfig is / usr / sbin / ifconfig (Thus the ifconfig command is an external command)
[root@localhost ~]# type du
du has been hashed (/ usr / bin / du)
3 , in the / create a directory under abc
[root@localhost ~]# mkdir -pv /abc
mkdir: directory has been created "/ abc"
[root@localhost ~]#
In / create directory / liangjian / liyunlong / weiheshang / duanpeng down
[the root @ localhost ~] # mkdir -pv / liangjian / liyunlong / weiheshang / duanpeng
mkdir: directory has been created "/ liangjian"
mkdir: directory has been created "/ liangjian / liyunlong"
mkdir: directory has been created "/ liangjian / liyunlong / weiheshang"
mkdir: directory has been created "/ liangjian / liyunlong / weiheshang / duanpeng"
Please / abc first created under the 1000 directory, to develop their own name.
[root@localhost abc]# mkdir -pv lxh{1..1000}
[root@localhost abc]# ls
lxh1 lxh138 lxh178 lxh217 lxh257 lxh297 lxh336 lxh376 lxh415 lxh455 lxh495 lxh534 lxh574 lxh613 lxh653 lxh693 lxh732 lxh772 lxh811 lxh851
4 , switch to / liangjian / liyunlong / weiheshang / duanpeng manner absolute path directory
And with pwd view the current path, with the name of the parent directory ".." to switch to / liangjian / liyunlong way down
[root @ localhost abc] # cd / liangjian / liyunlong / weiheshang / duanpeng
[root@localhost duanpeng]# pwd
/ Liangjian / liyunlong / weiheshang / duanpeng
[root@localhost duanpeng]# cd ../..
[root@localhost liyunlong]# pwd
/ Liangjian / liyunlong
5 , delete / abc again next time you create a 1000 directory, in the / abc case with touch and then create up to 20 Ge with stu beginning of ordinary readable document, the document as a .txt extension
[root@localhost abc]# rm -rf *
[root@localhost abc]# ls
[root@localhost abc]#
[root@localhost abc]# touch stu{1..20}.txt
[root@localhost abc]# ls
stu10.txt stu12.txt stu14.txt stu16.txt stu18.txt stu1.txt stu2.txt stu4.txt stu6.txt stu8.txt
stu11.txt stu13.txt stu15.txt stu17.txt stu19.txt stu20.txt stu3.txt stu5.txt stu7.txt stu9.txt
6 , please use cp to / boot / command 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 /boot/vmlinuz* /abc
[root@localhost ~]# ls /abc
stu10.txt stu12.txt stu14.txt stu16.txt stu18.txt stu1.txt stu2.txt stu4.txt stu6.txt stu8.txt vmlinuz-0-rescue-3d1fd611a8af42619df7f7839dfa5240
stu11.txt stu13.txt stu15.txt stu17.txt stu19.txt stu20.txt stu3.txt stu5.txt stu7.txt stu9.txt vmlinuz-3.10.0-229.el7.x86_64
[root@localhost ~]# du -h /abc/vmlinuz*
4.8M /abc/vmlinuz-0-rescue-3d1fd611a8af42619df7f7839dfa5240
4.8M /abc/vmlinuz-3.10.0-229.el7.x86_64
7 , in which a vmlinuz beginning of the file is renamed KGC , a further cut to the / tmp directory.
[root@localhost ~]# mv /abc/vmlinuz-0-rescue-3d1fd611a8af42619df7f7839dfa5240 /abc/kgc
[root@localhost ~]# ls /abc
kgc stu11.txt stu13.txt stu15.txt stu17.txt stu19.txt stu20.txt stu3.txt stu5.txt stu7.txt stu9.txt
stu10.txt stu12.txt stu14.txt stu16.txt stu18.txt stu1.txt stu2.txt stu4.txt stu6.txt stu8.txt vmlinuz-3.10.0-229.el7.x86_64
[root@localhost ~]# mv /abc/vmlinuz-3.10.0-229.el7.x86_64 /tmp
[root@localhost ~]# ls /tmp
hsperfdata_root ssh-jbqYrmgywUee systemd-private-bZsaKA vmlinuz-3.10.0-229.el7.x86_64 yum.log
ks-script-orrnFo systemd-private-0XwnWN systemd-private-D4pDtE vmware-root yum_save_tx.2019-07-23.09-13.ogrGx4.yumtx
8 , see the / tmp / to vmlinuz directory information detailed status beginning of the file.
[root@localhost ~]# stat /tmp/vmlinuz*
File: "/ tmp / vmlinuz-3.10.0-229.el7.x86_64"
Size: 5029136: 9824 IO block: 4096 regular file
Equipment: fd00h / 64768d Inode: 2944993 hard link: 1
Permissions: (0755 / -rwxr-xr-x) Uid :( 0 / root) Gid :( 0 / root)
环境：unconfined_u:object_r:default_t:s0
Last Visit: 2019-07-2317: 28: 04.388410003 +0800
Recent changes: 2019-07-2317: 28: 07.194424245 +0800
Recent changes: 2019-07-2319: 02: 25.592267350 +0800
Created: -
9 , with find find command / tmp to vmlinuz directory at the beginning and the size of more than 1M file
[root@localhost tmp]# find -name vmlinuz* -a -size +1M
./vmlinuz-3.10.0-229.el7.x86_64