课程第9次

botang

s位的小实验：

1. [root@station60 ~]# ls -l /usr/bin/passwd
   
2. -rwsr-xr-x. 1 root root 27832 Jan 29  2014 /usr/bin/passwd
   
3. [root@station60 ~]# ls -l /usr/bin/sleep
   
4. -rwxr-xr-x. 1 root root 33216 Jun 15  2018 /usr/bin/sleep
   
5. [root@station60 ~]# chmod u+s /usr/bin/sleep
   
6. [root@station60 ~]# ls -l /usr/bin/sleep
   
7. -rwsr-xr-x. 1 root root 33216 Jun 15  2018 /usr/bin/sleep
   
8. [root@station60 ~]# chmod u-s /usr/bin/sleep
   
9. [root@station60 ~]# ls -l /usr/bin/sleep
   
10. -rwxr-xr-x. 1 root root 33216 Jun 15  2018 /usr/bin/sleep
    
11. [root@station60 ~]# chmod u-x /usr/bin/sleep
    
12. [root@station60 ~]# ls -l /usr/bin/sleep
    
13. -rw-r-xr-x. 1 root root 33216 Jun 15  2018 /usr/bin/sleep
    
14. [root@station60 ~]# chmod u+s /usr/bin/sleep
    
15. [root@station60 ~]# ls -l /usr/bin/sleep
    
16. -rwSr-xr-x. 1 root root 33216 Jun 15  2018 /usr/bin/sleep
    
17. [root@station60 ~]# chmod 755 /usr/bin/sleep
    
18. [root@station60 ~]# ls -l /usr/bin/sleep
    
19. -rwxr-xr-x. 1 root root 33216 Jun 15  2018 /usr/bin/sleep
    
20. [root@station60 ~]# chmod 4755 /usr/bin/sleep
    
21. [root@station60 ~]# ls -l /usr/bin/sleep
    
22. -rwsr-xr-x. 1 root root 33216 Jun 15  2018 /usr/bin/sleep
    
23. [root@station60 ~]#
    

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目录group上s位的背景：

1. [root@station60 /]# mkdir sdir
   
2. [root@station60 /]# groupadd shareg
   
3. [root@station60 /]# chgrp shareg /sdir
   
4. [root@station60 /]# ls -ld /sdir
   
5. drwxr-xr-x. 2 root shareg 6 Apr 25 08:38 /sdir
   
6. [root@station60 /]# chmod g+w /sdir/
   
7. [root@station60 /]# ls -ld /sdir/
   
8. drwxrwxr-x. 2 root shareg 6 Apr 25 08:38 /sdir/
   
9. [root@station60 /]# gpasswd -a student shareg
   
10. Adding user student to group shareg
    
11. [root@station60 /]# gpasswd -a vistor shareg
    
12. gpasswd: user 'vistor' does not exist
    
13. [root@station60 /]# gpasswd -a visitor shareg
    
14. Adding user visitor to group shareg
    

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管道和文本处理：

1. [root@station60 ~]# ifconfig
   
2. ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
   
3.         inet 192.168.0.60  netmask 255.255.255.0  broadcast 192.168.0.255
   
4.         inet6 fe80::20c:29ff:fee2:5e6d  prefixlen 64  scopeid 0x20<link>
   
5.         inet6 fd00:ac20:2e24:80e2:20c:29ff:fee2:5e6d  prefixlen 64  scopeid 0x0<                                                                             global>
   
6.         ether 00:0c:29:e2:5e:6d  txqueuelen 1000  (Ethernet)
   
7.         RX packets 38347  bytes 5350032 (5.1 MiB)
   
8.         RX errors 0  dropped 3  overruns 0  frame 0
   
9.         TX packets 14824  bytes 3004099 (2.8 MiB)
   
10.         TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
    
11. 
    
12. lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
    
13.         inet 127.0.0.1  netmask 255.0.0.0
    
14.         inet6 ::1  prefixlen 128  scopeid 0x10<host>
    
15.         loop  txqueuelen 1000  (Local Loopback)
    
16.         RX packets 633  bytes 79406 (77.5 KiB)
    
17.         RX errors 0  dropped 0  overruns 0  frame 0
    
18.         TX packets 633  bytes 79406 (77.5 KiB)
    
19.         TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
    
20. 
    
21. virbr0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
    
22.         inet 192.168.122.1  netmask 255.255.255.0  broadcast 192.168.122.255
    
23.         ether 52:54:00:a6:b5:89  txqueuelen 1000  (Ethernet)
    
24.         RX packets 0  bytes 0 (0.0 B)
    
25.         RX errors 0  dropped 0  overruns 0  frame 0
    
26.         TX packets 0  bytes 0 (0.0 B)
    
27.         TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
    
28. 
    
29. [root@station60 ~]# ifconfig  | head -n 2 | tail -n 1
    
30.         inet 192.168.0.60  netmask 255.255.255.0  broadcast 192.168.0.255
    
31. [root@station60 ~]# ifconfig  | head -n 2 | tail -n 1  | cut -c 14-
    
32. 192.168.0.60  netmask 255.255.255.0  broadcast 192.168.0.255
    
33. [root@station60 ~]# ifconfig  | head -n 2 | tail -n 1  | cut -c 14-  | cut -f 1 -d ' '
    
34. 192.168.0.60
    
35. [root@station60 ~]# MYIPADDR=$(ifconfig  | head -n 2 | tail -n 1  | cut -c 14-  | cut -f 1 -d ' ')
    
36. [root@station60 ~]# echo $MYIPADDR
    
37. 192.168.0.60
    

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gunzip -c :

1. [root@station60 labs]# lvs
   
2.   LV   VG   Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
   
3.   root rhel -wi-ao---- <17.00g                                                  
   
4.   swap rhel -wi-ao----   2.00g                                                  
   
5. [root@station60 labs]# vgs
   
6.   VG   #PV #LV #SN Attr   VSize   VFree
   
7.   rhel   1   2   0 wz--n- <19.00g    0
   
8. [root@station60 labs]# dd if=/dev/rhel/swap bs=4M | gzip > /root/swap.gz
   
9. ^C268+0 records in
   
10. 267+0 records out
    
11. 1119879168 bytes (1.1 GB) copied, 23.2432 s, 48.2 MB/s
    
12. 
    
13. [root@station60 labs]# gunzip  -c /root/swap.gz  | dd of=/dev/rhel/swap bs=4M
    

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