使用sed替换configurtation文件中的值

Question

Conf.txt

Enable_FUN                                    Yes
FUN_Privilege_Level                           User
Force_FUN_Payload_Authentication              No
Force_FUN_Payload_Encryption                  No
Character_Accumulate_Interval                 12
Character_Send_Threshold                      96
FUN_Retry_Count                               7
FUN_Retry_Interval                            50
Non_Volatile_Bit_Rate                         115200
Volatile_Bit_Rate                             115200

我需要将"Volatile_Bit_Rate"值从115200更新到38400注意:Volatile_Bit_Rate和Non_Volatile_Bit_Rate具有相同的匹配字符串,格式(空格/制表符)也应保持不变.

我正在尝试以下方式,这是有效的.

var=38400
sed -i "s/\bVolatile_Bit_Rate\b/Volatile_Bit_Rate    $var/" solconf

然后我需要删除字符串的结尾.

但是,任何人都可以通过以下方式向我推荐正则表达式,这将有所帮助.

sed -i "s/\bVolatile_Bit_Rate\b(expression for allspaces)(somenumbers) /Volatile_Bit_Rate(spaces)$var/" solconf

Answer 1

你可以做:

sed 's/\(^Volatile_Bit_Rate[[:blank:]]\+\)[0-9]\+$/\138400/' file.txt

要编辑文件:

sed -i 's/\(^Volatile_Bit_Rate[[:blank:]]\+\)[0-9]\+$/\138400/' file.txt

例:

$ cat file.txt
Enable_FUN                                    Yes
FUN_Privilege_Level                           User
Force_FUN_Payload_Authentication              No
Force_FUN_Payload_Encryption                  No
Character_Accumulate_Interval                 12
Character_Send_Threshold                      96
FUN_Retry_Count                               7
FUN_Retry_Interval                            50
Non_Volatile_Bit_Rate                         115200
Volatile_Bit_Rate                             115200

$ sed 's/\(^Volatile_Bit_Rate[[:blank:]]\+\)[0-9]\+$/\138400/' file.txt
Enable_FUN                                    Yes
FUN_Privilege_Level                           User
Force_FUN_Payload_Authentication              No
Force_FUN_Payload_Encryption                  No
Character_Accumulate_Interval                 12
Character_Send_Threshold                      96
FUN_Retry_Count                               7
FUN_Retry_Interval                            50
Non_Volatile_Bit_Rate                         115200
Volatile_Bit_Rate                             38400