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 pwd internal command )
[root@localhost ~]# type ls
ls is `ls --color = auto ' aliases
[root@localhost ~]# type du
du has been hashed (/ usr / bin / du)
[root@localhost ~]# type ifconfig
ifconfig 是 /usr/sbin/ifconfig
2, please / create directory abc
[root@localhost ~]# mkdir /abc
[root@localhost ~]# ls /
abc boot etc lib media opt root sbin sys usr zhangjiaqi
bin dev home lib64 mnt proc run srv tmp var
Please / Create a directory / liangjian / liyunlong / weiheshang / duanpeng
[the 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 ~]# mkdir /abc/wbx{1..1000}
[root@localhost ~]# ls /abc
wbx1 wbx210 wbx323 wbx436 wbx549 wbx661 wbx774 wbx887
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
[the root @ localhost ~] # 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 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 abc]# rm -fr wbx{1..1000}
[root@localhost abc]# ls
[root@localhost abc]# touch stu{1..20}.txt
[root@localhost abc]# ls
stu10.txt stu14.txt stu18.txt stu2.txt stu6.txt
stu11.txt stu15.txt stu19.txt stu3.txt stu7.txt
stu12.txt stu16.txt stu1.txt stu4.txt stu8.txt
stu13.txt stu17.txt stu20.txt stu5.txt stu9.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 /boot/vmlinuz* /abc
[root@localhost ~]# du /abc/vmlinuz*
4912 /abc/vmlinuz-0-rescue-1e2f1204383043569e93e86f8a057c05
4912 /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 / tmp directory.
[root@localhost abc]# mv vmlinuz-3.10.0-229.el7.x86_64 kgc
[root@localhost abc]# ls
kgc stu1.txt
stu10.txt stu20.txt
stu11.txt stu2.txt
stu12.txt stu3.txt
stu13.txt stu4.txt
stu14.txt stu5.txt
stu15.txt stu6.txt
stu16.txt stu7.txt
stu17.txt stu8.txt
stu18.txt stu9.txt
stu19.txt vmlinuz-0-rescue-1e2f1204383043569e93e86f8a057c05
[root@localhost abc]# mv vmlinuz-0-rescue-1e2f1204383043569e93e86f8a057c05 /tmp
[root@localhost abc]# cd /tmp
[root@localhost tmp]# ls
hsperfdata_root
ks-script-CjJCT0
ssh-pD99kNe6JPLg
ssh-qlCLprGGealU
systemd-private-GdXfi3
systemd-private-GkZogA
systemd-private-hWXjl5
systemd-private-OM6y7g
systemd-private-SUqpm1
systemd-private-u5vgpx
vmlinuz-0-rescue-1e2f1204383043569e93e86f8a057c05
vmware-root
yum.log
yum_save_tx.2019-07-19.18-59.JAsUk0.yumtx
yum_save_tx.2019-07-23.09-03._DdbNC.yumtx
yum_save_tx.2019-07-23.09-04.VG05Pp.yumtx
yum_save_tx.2019-07-23.10-11.IzyuW_.yumtx
yum_save_tx.2019-07-23.10-34.Q5BLrw.yumtx
8, see the / tmp / to the directory vmlinuz detail beginning of the file status information.
[root@localhost tmp]# stat vmlinuz-0-rescue-1e2f1204383043569e93e86f8a057c05
File: "vmlinuz-0-Rescue-1e2f1204383043569e93e86f8a057c05"
Size: 5029136 block: 9824 IO block: 4096 regular file
Equipment: fd00h / 64768d Inode : 3024921 hard link: 1
Permissions: (0755 / XR--rwxr-X) Uid : (0 / the root) Gid : (0 / the root)
Last Visit: 2019-07-2319: 18: 12.094724252 +0800
Recent changes: 2019-07-2319: 18: 12.694760142 +0800
Recent changes: 2019-07-2319: 21: 15.191348992 +0800
Created: -
9, with find find command / tmp to directory vmlinuz beginning and larger than 1M file
[root@localhost tmp]# find /tmp -name vmlinuz* -a -size +1M
/tmp/vmlinuz-0-rescue-1e2f1204383043569e93e86f8a057c05
[root@localhost tmp]# du -hs /tmp/vmlinuz-0-rescue-1e2f1204383043569e93e86f8a057c05
4.8M /tmp/vmlinuz-0-rescue-1e2f1204383043569e93e86f8a057c05