Linux: Set Variable to Value following regex pattern, without quotes, in a single command (no pipes)-CodePudding

I need to grab a value from a config file (config.toml) and store it to a system variable.

I prefer to use a single command without pipes in the most compatible way possible (across linux systems)

Should return https://abridge.netlify.app with the config file set any of these ways:

base_url="https://abridge.netlify.app"
base_url = "https://abridge.netlify.app"
base_url  =  "https://abridge.netlify.app"

The solution I have so far based on some research is the following:

baseurl="$(sed -n -E 's/^base_url.*=\s ?\"//p' config.toml)"
echo $baseurl

My solution still has the trailing quotation mark, I have not yet figured out how to deal with it.

The other problem is I am not certain that this is the most universal solution. I prefer to use something that will work universally on most linux systems.

Appreciate all feedback, Thank You!

CodePudding user response：

Different implementations of sed understand different types of regex. Only BRE is portable:

sed -n 's/^base_url[[:space:]]*=[[:space:]]*"\([^"]*\)".*/\1/p' config.toml

CodePudding user response：

Edit, based on @jhnc feedback. I now use this:

baseurl="$(sed -n -E 's/^base_url.*=.*"(.*)"/\1/p' config.toml)"
echo $baseurl

I am still not sure if some Linux systems might run into issues with this or not.

If anyone sees an issue with this solution or has a more universally compatible solution please let me know.