[linux] How to read a .properties file which contains keys that have a period character using Shell script

I found using while IFS='=' read -r to be a bit slow (I don't know why, maybe someone could briefly explain in a comment or point to a SO answer?). I also found @Nicolai answer very neat as a one-liner, but very inefficient as it will scan the entire properties file over and over again for every single call of prop.

I found a solution that answers the question, performs well and it is a one-liner (bit verbose line though).

The solution does sourcing but massages the contents before sourcing:

#!/usr/bin/env bash

source <(grep -v '^ *#' ./app.properties | grep '[^ ] *=' | awk '{split($0,a,"="); print gensub(/\./, "_", "g", a[1]) "=" a[2]}')

echo $db_uat_user

Explanation:

grep -v '^ *#': discard comment lines grep '[^ ] *=': discards lines without = split($0,a,"="): splits line at = and stores into array a, i.e. a[1] is the key, a[2] is the value gensub(/\./, "_", "g", a[1]): replaces . with _ print gensub... "=" a[2]} concatenates the result of gensub above with = and value.

Edit: As others pointed out, there are some incompatibilities issues (awk) and also it does not validate the contents to see if every line of the property file is actually a kv pair. But the goal here is to show the general idea for a solution that is both fast and clean. Sourcing seems to be the way to go as it loads the properties once that can be used multiple times.

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