awk对某个字段分割处理

工作中遇到要根据文件中某个字段分割成多行文本的处理，想到用awk处理，这里记录下：

问题：

    原文件：假设一共2个字段，用“|”分割，其中第二个字段用“#”分割，但该字段中也有不含“#”的值和空值

    要求：根据第二个字段，若含#，将这条数据根据#分割成多条数据，无#和无值的行不变

202143108500|#0_1000_VOICE#0_1000_VOICE#0_1000_VOICE#0_TRAFFIC#0_TRAFFIC#0_TRAFFIC
202121366359|#0_1000_VOICE#0_TRAFFIC
202143108500|#0_1000_VOICE#0_1000_VOICE#0_1000_VOICE#0_TRAFFIC#0_TRAFFIC#0_TRAFFIC
202121366359|#0_1000_VOICE#0_TRAFFIC
202113492312|W_GH_YYM
202132164529|

用awk解决：

1、将含“#”的一行变多行

awk -F "|"  -vOFS="|"  '{l=split($2,arr,"#");for(i=1;i<l;i++){$2=arr[i+1];print}}' ./test.txt

结果：

202143108500|0_1000_VOICE
202143108500|0_1000_VOICE
202143108500|0_1000_VOICE
202143108500|0_TRAFFIC
202143108500|0_TRAFFIC
202143108500|0_TRAFFIC
202121366359|0_1000_VOICE
202121366359|0_TRAFFIC
202143108500|0_1000_VOICE
202143108500|0_1000_VOICE
202143108500|0_1000_VOICE
202143108500|0_TRAFFIC
202143108500|0_TRAFFIC
202143108500|0_TRAFFIC
202121366359|0_1000_VOICE
202121366359|0_TRAFFIC

2、将不含“#”筛选出来

awk -F "|"  '$2!~/#/{print}' ./test.txt

结果：

202113492312|W_GH_YYM
202132164529|

经过上面两步就可以解决，将结果生成新的文件 a.txt

awk -F "|"  -vOFS="|"  '{l=split($2,arr,"#");for(i=1;i<l;i++){$2=arr[i+1];print}}' ./test.txt >a.txt
awk -F "|"  '$2!~/#/{print}' ./test.txt >>a.txt

a.txt:

202143108500|0_1000_VOICE
202143108500|0_1000_VOICE
202143108500|0_1000_VOICE
202143108500|0_TRAFFIC
202143108500|0_TRAFFIC
202143108500|0_TRAFFIC
202121366359|0_1000_VOICE
202121366359|0_TRAFFIC
202143108500|0_1000_VOICE
202143108500|0_1000_VOICE
202143108500|0_1000_VOICE
202143108500|0_TRAFFIC
202143108500|0_TRAFFIC
202143108500|0_TRAFFIC
202121366359|0_1000_VOICE
202121366359|0_TRAFFIC
202113492312|W_GH_YYM
202132164529|