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删除特定单词出现的最后一行上的字符

tag-icon • tag-icon linux text-processing awk sed
删除特定单词出现的最后一行上的字符

我们有以下文件示例

我们要删除单词存在的, 最后一行上的字符topic

more file

{"topic":"life_is_hard","partition":84,"replicas":[1006,1003]},
{"topic":"life_is_hard","partition":85,"replicas":[1001,1004]},
{"topic":"life_is_hard","partition":86,"replicas":[1002,1005]},
{"topic":"life_is_hard","partition":87,"replicas":[1003,1006]},
{"topic":"life_is_hard","partition":88,"replicas":[1004,1001]},
{"topic":"life_is_hard","partition":89,"replicas":[1005,1002]},
{"topic":"life_is_hard","partition":90,"replicas":[1006,1004]},
{"topic":"life_is_hard","partition":91,"replicas":[1001,1005]},
{"topic":"life_is_hard","partition":92,"replicas":[1002,1006]},
{"topic":"life_is_hard","partition":93,"replicas":[1003,1001]},
{"topic":"life_is_hard","partition":94,"replicas":[1004,1002]},
{"topic":"life_is_hard","partition":95,"replicas":[1005,1003]},
{"topic":"life_is_hard","partition":96,"replicas":[1006,1005]},
{"topic":"life_is_hard","partition":97,"replicas":[1001,1006]},
{"topic":"life_is_hard","partition":98,"replicas":[1002,1001]},
{"topic":"life_is_hard","partition":99,"replicas":[1003,1002]},

预期产出

{"topic":"life_is_hard","partition":84,"replicas":[1006,1003]},
{"topic":"life_is_hard","partition":85,"replicas":[1001,1004]},
{"topic":"life_is_hard","partition":86,"replicas":[1002,1005]},
{"topic":"life_is_hard","partition":87,"replicas":[1003,1006]},
{"topic":"life_is_hard","partition":88,"replicas":[1004,1001]},
{"topic":"life_is_hard","partition":89,"replicas":[1005,1002]},
{"topic":"life_is_hard","partition":90,"replicas":[1006,1004]},
{"topic":"life_is_hard","partition":91,"replicas":[1001,1005]},
{"topic":"life_is_hard","partition":92,"replicas":[1002,1006]},
{"topic":"life_is_hard","partition":93,"replicas":[1003,1001]},
{"topic":"life_is_hard","partition":94,"replicas":[1004,1002]},
{"topic":"life_is_hard","partition":95,"replicas":[1005,1003]},
{"topic":"life_is_hard","partition":96,"replicas":[1006,1005]},
{"topic":"life_is_hard","partition":97,"replicas":[1001,1006]},
{"topic":"life_is_hard","partition":98,"replicas":[1002,1001]},
{"topic":"life_is_hard","partition":99,"replicas":[1003,1002]}

sed（GNU sed）4.2.2

答案1

使用 GNU sed 和 tac：

tac bad.json | sed '0,/"topic"/s/,$//' | tac

如果该行有尾随空格，请将模式更改为,[[:blank:]]*$

答案2

像这样 ：

sed -i '${s/,[[:blank:]]*$//}' file

该命令替换文件在飞行中。

答案3

GNU sed在扩展正则表达式模式下使用-r我们可以这样做：

sed -ri -e '
   /"topic"/{
      x;1!p;ba
   }
   H;1h;:a;$!d;g
   //s/^([^\n]+),(\n|$)/\1\2/
' file

基本思想是将包含线开始"topic"到下一条线（无论距离有多远）的线收集到保留空间中。然后，当我们最终到达 eof 时，我们,从行尾删除（=>“topic”行是最后一行）或从第一个换行符（=>“topic”是文件中的最后一个，但后面是一些在我们到达 eof 之前还有更多非主题行。）

答案4

用python方法完成

 #!/usr/bin/python
import re
k=re.compile(r',$')
t=open('filename','r')
l=[]
for i in t:
    l.append(i.strip())
for h in range(0,len(l),1):
    if (h <15):
        print l[h]
    else:
        print re.sub(k,"",l[h])

输出

{"topic":"life_is_hard","partition":84,"replicas":[1006,1003]},
{"topic":"life_is_hard","partition":85,"replicas":[1001,1004]},
{"topic":"life_is_hard","partition":86,"replicas":[1002,1005]},
{"topic":"life_is_hard","partition":87,"replicas":[1003,1006]},
{"topic":"life_is_hard","partition":88,"replicas":[1004,1001]},
{"topic":"life_is_hard","partition":89,"replicas":[1005,1002]},
{"topic":"life_is_hard","partition":90,"replicas":[1006,1004]},
{"topic":"life_is_hard","partition":91,"replicas":[1001,1005]},
{"topic":"life_is_hard","partition":92,"replicas":[1002,1006]},
{"topic":"life_is_hard","partition":93,"replicas":[1003,1001]},
{"topic":"life_is_hard","partition":94,"replicas":[1004,1002]},
{"topic":"life_is_hard","partition":95,"replicas":[1005,1003]},
{"topic":"life_is_hard","partition":96,"replicas":[1006,1005]},
{"topic":"life_is_hard","partition":97,"replicas":[1001,1006]},
{"topic":"life_is_hard","partition":98,"replicas":[1002,1001]},
{"topic":"life_is_hard","partition":99,"replicas":[1003,1002]}

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