用于按行處理文本文件

https://www.runoob.com/linux/linux-comm-sed.html
http://www.itdecent.cn/p/90fc7c663143

1. 基本語法

cat file|sed 'number operation'

參數(shù)說明：
-n / --quiet / --silent : 僅顯示script處理后的結果，有些命令不適用本參數(shù)則會將原文本一起輸出

2. 刪除行

(base) zhiyong@zhiyong-OptiPlex-7050:~/Work$ cat kkk 
1------------------------------------------------1
2------------------------------------------------2
3------------------------------------------------3
4------------------------------------------------4
5------------------------------------------------5
6------------------------------------------------6
7------------------------------------------------7

(base) zhiyong@zhiyong-OptiPlex-7050:~/Work$ cat kkk|sed '2,4d'  #刪除第二到第四行
1------------------------------------------------1
5------------------------------------------------5
6------------------------------------------------6
7------------------------------------------------7

對以上的刪除操作，效果相同的寫法還有：
cat kkk|sed 2,4d 可以省略單引號
cat kkk|sed -e 2,4d 用 -e 來指定操作
cat kkk|sed 2,4\d 用反斜杠來隔離數(shù)字和操作
cat kkk|sed -e 2,4\d 反斜杠和 -e 結合
cat kkk|sed -e '2,4d' 單引號和 -e 結合

如果只想刪除其中的一行，將 d 之前的數(shù)字改成想要刪除的行號即可

刪除某行到最后一行
cat kkk|sed '3,$d'
在 sed 操作中，用 $ 代表最后一行的行號

3. 增加行

3.1 在某行前新增一行

(base) zhiyong@zhiyong-OptiPlex-7050:~/Work$ cat kkk 
1------------------------------------------------1
2------------------------------------------------2
3------------------------------------------------3
4------------------------------------------------4
5------------------------------------------------5
6------------------------------------------------6
7------------------------------------------------7

(base) zhiyong@zhiyong-OptiPlex-7050:~/Work$ cat kkk|sed '5i llll'  #在第五行前新增一行
1------------------------------------------------1
2------------------------------------------------2
3------------------------------------------------3
4------------------------------------------------4
llll
5------------------------------------------------5
6------------------------------------------------6
7------------------------------------------------7

(base) zhiyong@zhiyong-OptiPlex-7050:~/Work$ cat kkk|sed 5i\llll   #在第五行前新增一行
1------------------------------------------------1
2------------------------------------------------2
3------------------------------------------------3
4------------------------------------------------4
llll
5------------------------------------------------5
6------------------------------------------------6
7------------------------------------------------7

(base) zhiyong@zhiyong-OptiPlex-7050:~/Work$ cat kkk|sed '3i pppp\
uuuuuu'  #增加兩行及以上內(nèi)容
1------------------------------------------------1
2------------------------------------------------2
pppp
uuuuuu
3------------------------------------------------3
4------------------------------------------------4
5------------------------------------------------5
6------------------------------------------------6
7------------------------------------------------7

當增加兩行及以上內(nèi)容時，每行新增加的字符后要緊跟一個反斜杠，下一行要增加的內(nèi)容要換行輸入

3.2 在某行后新增一行

(base) zhiyong@zhiyong-OptiPlex-7050:~/Work$ cat kkk 
1------------------------------------------------1
2------------------------------------------------2
3------------------------------------------------3
4------------------------------------------------4
5------------------------------------------------5
6------------------------------------------------6
7------------------------------------------------7

(base) zhiyong@zhiyong-OptiPlex-7050:~/Work$ cat kkk|sed '3a pppppp'  #在第三行后新增一行
1------------------------------------------------1
2------------------------------------------------2
3------------------------------------------------3
pppppp
4------------------------------------------------4
5------------------------------------------------5
6------------------------------------------------6
7------------------------------------------------7

(base) zhiyong@zhiyong-OptiPlex-7050:~/Work$ cat kkk|sed 3a\pppppp  ‘’#在第三行后新增一行
1------------------------------------------------1
2------------------------------------------------2
3------------------------------------------------3
pppppp
4------------------------------------------------4
5------------------------------------------------5
6------------------------------------------------6
7------------------------------------------------7

(base) zhiyong@zhiyong-OptiPlex-7050:~/Work$ cat kkk|sed '3a pppp\
uuuuuu'  #在第三行后增加連續(xù)的兩行
1------------------------------------------------1
2------------------------------------------------2
3------------------------------------------------3
pppp
uuuuuu
4------------------------------------------------4
5------------------------------------------------5
6------------------------------------------------6
7------------------------------------------------7

當增加兩行及以上內(nèi)容時，每行新增加的字符后要緊跟一個反斜杠，下一行要增加的內(nèi)容要換行輸入

4. 以行為單位進行替換

(base) zhiyong@zhiyong-OptiPlex-7050:~/Work$ cat kkk 
1------------------------------------------------1
2------------------------------------------------2
3------------------------------------------------3
4------------------------------------------------4
5------------------------------------------------5
6------------------------------------------------6
7------------------------------------------------7

(base) zhiyong@zhiyong-OptiPlex-7050:~/Work$ cat kkk|sed '3,5c ttttttttttttttttttt'  #將文本的第3到5行替換為一行指定文本
1------------------------------------------------1
2------------------------------------------------2
ttttttttttttttttttt
6------------------------------------------------6
7------------------------------------------------7

(base) zhiyong@zhiyong-OptiPlex-7050:~/Work$ cat kkk|sed '3,5c ttttttttttttttttttt\  #將文本的第3到5行替換成兩行或以上指定文本
> pppppppppppppp'
1------------------------------------------------1
2------------------------------------------------2
ttttttttttttttttttt
pppppppppppppp
6------------------------------------------------6
7------------------------------------------------7

5. 以行為單位進行顯示

(base) zhiyong@zhiyong-OptiPlex-7050:~/Work$ cat kkk 
1------------------------------------------------1
2------------------------------------------------2
3------------------------------------------------3
4------------------------------------------------4
5------------------------------------------------5
6------------------------------------------------6
7------------------------------------------------7

(base) zhiyong@zhiyong-OptiPlex-7050:~/Work$ cat kkk|sed -n '2p'  #僅顯示第二行
2------------------------------------------------2

(base) zhiyong@zhiyong-OptiPlex-7050:~/Work$ cat kkk|sed -n '2,5p'   '#僅顯示第二到第五行
2------------------------------------------------2
3------------------------------------------------3
4------------------------------------------------4
5------------------------------------------------5

6. 字符串查找

(base) zhiyong@zhiyong-OptiPlex-7050:~/Work$ cat kkk|sed -n '/3/p'  #查找所有包含3的行，注意參數(shù)-n的使用
3------------------------------------------------3
3------------------------------------------------3

7. 刪除最后幾行

for i in `seq 10`; do sed -i '$d' aa ; done

(base) zhiyong@zhiyong-OptiPlex-7050:~/Work/Now/Orthology/OrthoDB/Amel_Bimp/Existing_in_all_species$ cat aa|tail
  "count": 6795,
  "skip": 0,
  "limit": 1000,
  "query": "",
  "level": 34735,
  "url": "https://v101.orthodb.org//search?query=&level=34735&species=7460_0%2C132113_0&universal=1&singlecopy=",
  "universal": 100,
  "singlecopy": null,
  "inclusive": 1
}

(base) zhiyong@zhiyong-OptiPlex-7050:~/Work/Now/Orthology/OrthoDB/Amel_Bimp/Existing_in_all_species$ for i in `seq 10`; do sed -i '$d' aa ; done

(base) zhiyong@zhiyong-OptiPlex-7050:~/Work/Now/Orthology/OrthoDB/Amel_Bimp/Existing_in_all_species$ cat aa|tail
    "115at34735",
    "1667at34735",
    "1002at34735",
    "1242at34735",
    "1937at34735",
    "1413at34735",
    "1118at34735",
    "1398at34735",
    "1255at34735"
  ],