bash Sed 错误：替换表达式中的错误选项
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Sed error : bad option in substitution expression
提问by ogs
I have a configuration file (gpsd.default) containing data with the following format:
我有一个gpsd.default包含以下格式数据的配置文件 ( )：
# If you must specify a non-NMEA driver, uncomment and modify the next line
GPSD_SOCKET="/var/run/gpsd.sock"
GPSD_OPTIONS=""
GPS_DEVICES=""
I am making a change on the file with sed:
我正在使用 sed 对文件进行更改：
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
The above sedcommand returns error:
上面的sed命令返回错误：
sed: bad option in substitution expression
sed：替换表达式中的错误选项
Because the new line contains "/" in its expression.
因为新行在/其表达式中包含“ ”。
How to update my sedcommand to make it work?
如何更新我的sed命令以使其工作？
回答by fedorqui 'SO stop harming'
This is because you are using a regex containing /, which is the same character seduses as delimiter.
这是因为您使用的是包含 的正则表达式/，它与sed用作分隔符的字符相同。
Just change the seddelimiter to another one, for example ~:
只需将sed分隔符更改为另一个，例如~：
sed -i 's~^GPS_DEVICES="".*~GPS_DEVICES="dev/ttyUSB1"~' /etc/default/gpsd.default
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.
顺便说一下，由于您正在更改 中的文件/etc，您可能需要使用-i.bak，以便备份原始文件。防止丢失重要信息是一种很好的做法。
回答by Harshad Yeola
You should update your sed command to this.
您应该将您的 sed 命令更新为此。
sed -i 's/^GPS_DEVICES=\"\".*/GPS_DEVICES=\"dev\/ttyUSB1\"/' /etc/default/gpsd.default
