sed系列:行或者模式匹配刪除特定行

「p」 command prints the buffer (remember to use -n option with 「p」) 
「d」 command is just opposite, its for deletion. ‘d’ will delete the pattern space buffer and immediately starts the next cycle. 

Syntax: 
# sed 'ADDRESS'd filename 
# sed /PATTERN/d filename 

Let us first creates thegeekstuff.txt file that will be used in all the examples mentioned below. 
# cat thegeekstuff.txt 
1. Linux - Sysadmin, Scripting etc. 
2. Databases - Oracle, mySQL etc. 
3. Hardware 
4. Security (Firewall, Network, Online Security etc) 
5. Storage 
6. Cool gadgets and websites 
7. Productivity (Too many technologies to explore, not much time available) 
8. Website Design 
9. Software Development 
10.Windows- Sysadmin, reboot etc. 

例子１:刪除第ｎ行 
sed ‘Nd’ filename 
As per sed methodology, 
It reads the first line and places in its pattern buffer. 
Check whether supplied command is true for this line, if true, deletes pattern space buffer and starts next cycle. i.e Read next line. 
If supplied command doesnt true, as its normal behaviour it prints the content of the pattern space buffer. 

$ sed 3d thegeekstuff.txt 
1. Linux - Sysadmin, Scripting etc. 
2. Databases - Oracle, mySQL etc. 
4. Security (Firewall, Network, Online Security etc) 
5. Storage 
6. Cool gadgets and websites 
7. Productivity (Too many technologies to explore, not much time available) 
8. Website Design 
9. Software Development 
10.Windows- Sysadmin, reboot etc. 
例２:從第三行開始,每隔一行刪除 
$sed 3~2d thegeekstuff.txt 
1. Linux - Sysadmin, Scripting etc. 
2. Databases - Oracle, mySQL etc. 
4. Security (Firewall, Network, Online Security etc) 
6. Cool gadgets and websites 
8. Website Design 
10.Windows- Sysadmin, reboot etc. 
$ 
例３:刪除從第４行到第８行 
$sed 4,8d thegeekstuff.txt 
1. Linux - Sysadmin, Scripting etc. 
2. Databases - Oracle, mySQL etc. 
3. Hardware 
9. Software Development 
10.Windows- Sysadmin, reboot etc. 
$sed '4,8d' thegeekstuff.txt 
1. Linux - Sysadmin, Scripting etc. 
2. Databases - Oracle, mySQL etc. 
3. Hardware 
9. Software Development 
10.Windows- Sysadmin, reboot etc. 
$sed '4,8'd thegeekstuff.txt 
1. Linux - Sysadmin, Scripting etc. 
2. Databases - Oracle, mySQL etc. 
3. Hardware 
9. Software Development 
10.Windows- Sysadmin, reboot etc. 
例４:刪除最後一行 
$sed '$'d thegeekstuff.txt 
1. Linux - Sysadmin, Scripting etc. 
2. Databases - Oracle, mySQL etc. 
3. Hardware 
4. Security (Firewall, Network, Online Security etc) 
5. Storage 
6. Cool gadgets and websites 
7. Productivity (Too many technologies to explore, not much time available) 
8. Website Design 
9. Software Development 
$sed '$d' thegeekstuff.txt 
1. Linux - Sysadmin, Scripting etc. 
2. Databases - Oracle, mySQL etc. 
3. Hardware 
4. Security (Firewall, Network, Online Security etc) 
5. Storage 
6. Cool gadgets and websites 
7. Productivity (Too many technologies to explore, not much time available) 
8. Website Design 
9. Software Development 
例５:行匹配刪除 
$sed /Sysadmin/d thegeekstuff.txt 
2. Databases - Oracle, mySQL etc. 
3. Hardware 
4. Security (Firewall, Network, Online Security etc) 
5. Storage 
6. Cool gadgets and websites 
7. Productivity (Too many technologies to explore, not much time available) 
8. Website Design 
9. Software Development 
$sed '/Sysadmin/d' thegeekstuff.txt 
2. Databases - Oracle, mySQL etc. 
3. Hardware 
4. Security (Firewall, Network, Online Security etc) 
5. Storage 
6. Cool gadgets and websites 
7. Productivity (Too many technologies to explore, not much time available) 
8. Website Design 
9. Software Development 
$sed '/Sysadmin/'d thegeekstuff.txt 
2. Databases - Oracle, mySQL etc. 
3. Hardware 
4. Security (Firewall, Network, Online Security etc) 
5. Storage 
6. Cool gadgets and websites 
7. Productivity (Too many technologies to explore, not much time available) 
8. Website Design 
9. Software Development 
$ 
例６:從匹配行到末尾行 
$sed '/Website Design/,$d' thegeekstuff.txt 
1. Linux - Sysadmin, Scripting etc. 
2. Databases - Oracle, mySQL etc. 
3. Hardware 
4. Security (Firewall, Network, Online Security etc) 
5. Storage 
6. Cool gadgets and websites 
7. Productivity (Too many technologies to explore, not much time available) 
$sed '/Website Design/,$'d  thegeekstuff.txt 
1. Linux - Sysadmin, Scripting etc. 
2. Databases - Oracle, mySQL etc. 
3. Hardware 
4. Security (Firewall, Network, Online Security etc) 
5. Storage 
6. Cool gadgets and websites 
7. Productivity (Too many technologies to explore, not much time available) 
例７:刪除匹配行和以後兩行 
$sed '/Storage/,+2d' thegeekstuff.txt 
1. Linux - Sysadmin, Scripting etc. 
2. Databases - Oracle, mySQL etc. 
3. Hardware 
4. Security (Firewall, Network, Online Security etc) 
8. Website Design 
9. Software Development 
10.Windows- Sysadmin, reboot etc. 
$sed '/Storage/,+2'd thegeekstuff.txt 
1. Linux - Sysadmin, Scripting etc. 
2. Databases - Oracle, mySQL etc. 
3. Hardware 
4. Security (Firewall, Network, Online Security etc) 
8. Website Design 
9. Software Development 
10.Windows- Sysadmin, reboot etc. 
例８:刪除空行 
$sed '/^$/d' thegeekstuff.txt 
1. Linux - Sysadmin, Scripting etc. 
2. Databases - Oracle, mySQL etc. 
3. Hardware 
4. Security (Firewall, Network, Online Security etc) 
5. Storage 
6. Cool gadgets and websites 
7. Productivity (Too many technologies to explore, not much time available) 
8. Website Design 
9. Software Development 
10.Windows- Sysadmin, reboot etc.