sed能否用file1的内容替换掉file2特定行的内容

791605975

如图
咋用sed让file1的字符串替换file2文件里的特定行的字符串，谢谢

little_angel

没明白你说的是什么。。。。

791605975

就是用下面那张图里的内容替换上面那张图的特定的三行，address,netmask,gateway这三行回复 2# little_angel


   

791605975

1.         address 192.168.1.123
   
2.         netmask 255.255.255.0
   
3.         gateway 192.168.1.1

复制代码

1. # /etc/network/interfaces -- configuration file for ifup(8), ifdown(8)
   
2. 
   
3. # The loopback interface
   
4. auto lo
   
5. iface lo inet loopback
   
6. 
   
7. 
   
8. # Wireless interfaces
   
9. #
   
10. # Example of an unencrypted (no WEP or WPA) wireless connection
    
11. # that connects to any available access point:
    
12. #
    
13. iface wlan0 inet dhcp
    
14.         wireless_mode managed
    
15.         wireless_essid any
    
16. #
    
17. #
    
18. # Same as above but locked to a specific access point:
    
19. #
    
20. #iface wlan0 inet dhcp  
    
21. #        wireless_mode managed
    
22. #        wireless-essid some-essid
    
23. #
    
24. # A WEP encrypted connection locked to a specific access point:
    
25. #
    
26. #iface wlan0 inet dhcp  
    
27. #        wireless-essid some-essid
    
28. #        wireless-key s:My-PlainText-Password
    
29. #        wireless-mode managed                  
    
30. #
    
31. # A WPA1 or WPA2 encrypted connection locked to a specific access point.
    
32. # This is the best option for non-roaming, single-network usage.
    
33. # Note that your card may require a firmware update to use WPA.
    
34. # Some distributions install a temporary volatile firmware update on ifup.
    
35. #
    
36. #iface wlan0 inet dhcp                                                   
    
37. #        wpa-essid some-essid                                          
    
38. #        wpa-psk My-PlainText-Password                                             
    
39. #
    
40. # A WPA1 or WPA2 encrypted connection using an external configuration file
    
41. # for wpa-supplicant. This is the way to go if you need to configure multiple
    
42. # networks with different keys and / or WPA settings and roaming support.
    
43. #
    
44. # iface wlan0 inet dhcp
    
45. #    wpa-conf /etc/wpa_supplicant.conf
    
46. #    wpa-driver hostap
    
47. 
    
48. 
    
49. 
    
50. iface atml0 inet dhcp
    
51. 
    
52. # Wired or wireless interfaces
    
53. auto eth0
    
54. iface eth0 inet static
    
55.         address 192.168.1.22
    
56.         netmask 255.255.255.0
    
57.         gateway 192.168.1.1
    
58. 
    
59. #iface eth0 inet dhcp
    
60. iface eth1 inet dhcp
    
61. 
    
62. # Ethernet/RNDIS gadget (g_ether)
    
63. # ... or on host side, usbnet and random hwaddr
    
64. iface usb0 inet static
    
65.         address 192.168.0.202
    
66.         netmask 255.255.255.0
    
67.         network 192.168.0.0
    
68.         gateway 192.168.0.200
    
69. 
    
70. 
    
71. # Zaurus 2.4 Lineo net_fd; obsolete
    
72. iface usbd0 inet static
    
73.         address 192.168.129.201
    
74.         netmask 255.255.255.0
    
75.         network 192.168.129.0
    
76.         gateway 192.168.129.200
    
77. 
    
78. # iPAQ 2.4 mach-sa1100/usb-eth
    
79. # (192.168.0.202 is the iPAQ's IP, 192.168.0.200 is the host's IP)
    
80. iface usbf inet static
    
81.         address 192.168.0.202
    
82.         netmask 255.255.255.0
    
83.         network 192.168.0.0
    
84.         gateway 192.168.0.200
    
85. 
    
86. # Bluetooth networking
    
87. iface bnep0 inet dhcp
    

复制代码

jason680

回复 4# 791605975

$ awk 'FNR==NR{a[$1]=$2;next}/^iface /{g=($2=="eth0")?1:0}g&&/^[^#]/{if(a[$1])sub($1".*$",$1" "a[$1])}1' file1 file2 > file3

$ cat file1
        address 192.168.1.123
        netmask 255.255.255.0
        gateway 192.168.1.1

$ grep -A3 '^iface eth0' file2
iface eth0 inet static
        address 192.168.1.22
        netmask 255.255.255.0
        gateway 192.168.1.1

$ grep -A3 '^iface eth0' file3
iface eth0 inet static
        address 192.168.1.123
        netmask 255.255.255.0
        gateway 192.168.1.1

songyc_2015

回复 1# 791605975
$sed -n 'h;/^iface eth0/{:a;H;n;/^$/!ba;g;s/\n.*//;r file1
};p' file2 > file3

$ cat file1
        address 192.168.1.123
        netmask 255.255.255.0
        gateway 192.168.1.1

$ grep -A3 '^iface eth0' file2
iface eth0 inet static
        address 192.168.1.22
        netmask 255.255.255.0
        gateway 192.168.1.1

$ grep -A3 '^iface eth0' file3
iface eth0 inet static
        address 192.168.1.123
        netmask 255.255.255.0
        gateway 192.168.1.1