sed错误:替换表达式中的错误选项 [英] Sed error : bad option in substitution expression

问题描述

我有一个配置文件(gpsd.default)，其中包含以下格式的数据:

I have a configuration file (gpsd.default) containing data with the following format:

# If you must specify a non-NMEA driver, uncomment and modify the next line     
GPSD_SOCKET="/var/run/gpsd.sock"                                                
GPSD_OPTIONS=""                                                                
GPS_DEVICES="" 

我正在使用sed更改文件:

I am making a change on the file with sed:

sed -i 's/^GPS_DEVICES="".*/GPS_DEVICES="dev/ttyUSB1"/' /etc/default/gpsd.default
or 
sed -i '4s/^.*/GPS_DEVICES="dev/ttyUSB1"/' /etc/default/gpsd.default

上面的sed命令返回错误:

sed:替换表达式中的错误选项

sed: bad option in substitution expression

因为新行的表达式中包含"/".

Because the new line contains "/" in its expression.

如何更新我的sed命令以使其起作用?

How to update my sed command to make it work?

推荐答案

这是因为您正在使用包含/的正则表达式，该正则表达式与sed用作分隔符的字符相同.

This is because you are using a regex containing /, which is the same character sed uses as delimiter.

只需将sed分隔符更改为另一个，例如~:

Just change the sed delimiter to another one, for example ~:

sed -i 's~^GPS_DEVICES="".*~GPS_DEVICES="dev/ttyUSB1"~' /etc/default/gpsd.default

顺便说一句，由于要在/etc中更改文件，因此可能要使用-i.bak，以便备份原始文件.防止重要信息丢失是一个好习惯.

By the way, since you are changing files in /etc, you may want to use -i.bak, so that the original file gets backed up. It is a good practice to prevent loss of important information.

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