Shell技巧 三行并为一行

将以下三行并为一行，并用,号分隔。

mail: [e-mail]
mailQuota:
userPassword:: c2VjcmV0
mail: [e-mail]
mailQuota:
userPassword:: c2VjcmV0
mail: [e-mail]
mailQuota: 10000
userPassword:: e2NyeXB0fWhDM21NNm1zQUtBUXc=
mail: [e-mail]
mailQuota: 10000
userPassword:: e2NyeXB0fUtuQW50NEx6TS4zRG8=
mail: [e-mail]
mailQuota: 50000
userPassword:: e2NyeXB0fUtuLmVpUTNDTkNUeTI=
 

 

方法一：

awk '{if (NR%3==0) {print} else {printf "%s,",$0}}' aaa
 

mail: [e-mail],mailQuota: ,userPassword:: c2VjcmV0
mail: [e-mail],mailQuota: ,userPassword:: c2VjcmV0
mail: [e-mail],mailQuota: 10000,userPassword:: e2NyeXB0fWhDM21NNm1zQUtBUXc=
mail: [e-mail],mailQuota: 10000,userPassword:: e2NyeXB0fUtuQW50NEx6TS4zRG8=
mail: [e-mail],mailQuota: 50000,userPassword:: e2NyeXB0fUtuLmVpUTNDTkNUeTI=

 

 
方法2：
sed '/mail:/ !N;s/\n/, /' user.txt  | sed '$!N;s/\n/, /'
 

结果如下：
mail: [e-mail], mailQuota: , userPassword:: c2VjcmV0
mail: [e-mail], mailQuota: , userPassword:: c2VjcmV0
mail: [e-mail], mailQuota: 10000, userPassword:: e2NyeXB0fWhDM21NNm1zQUtBUXc=
mail: [e-mail], mailQuota: 10000, userPassword:: e2NyeXB0fUtuQW50NEx6TS4zRG8=
mail: [e-mail], mailQuota: 50000, userPassword:: e2NyeXB0fUtuLmVpUTNDTkNUeTI=
mail: [e-mail], mailQuota: 10000, userPassword:: e2NyeXB0fXdWN25HdFAzVHlQU2M=
 
方法3：
ultraedit32下记录宏和执行宏。