Source command for those lines in file which doesn't have equal to(=)

Question

I have a file like this:

(blank line)
[Test1]
a=1
b=2
c=3

I have to read value of a,b,c in variables, so I used source command and it did the job. But for the line 2 i.e. [Test1], it show command not found.

How can I take [Test1] in a variable too?

Basically I am expecting:

$some_var=[Test1]
$a=1
$b=2
$c=3

So I can use these values further.

Currently what I am doing is removing first two lines from the file and then source file, and by doing this I am not getting line 2 in a variable. I am looking for a better way. I am doing it all inside a bash script.

Answer 1

Assuming you have process substitution, you can do something like this:

source <(sed 's/^\[/some_var=\[/' file)

Answer 2

If the files are not big (since bash 4.4):

readarray -t arr <infile         # the value in zero is a blank line.
some_var="${arr[1]}"             # use the first line.
. <(printf '%s\n' "${arr[@]:2}") # source the rest.
echo "some_var=$some_var a=$a a=$b a=$c"

When executed:

$ ./script
some_var=[Test1] a=1 a=2 a=3

For older bash, the solution becomes much more convoluted, but possible.
This is the equivalent since bash 2.04 (2000-03-21).

unset arr; i=0
while IFS='' read -r a ; do arr[i]="$a"; ((i++));done <infile
some_var="${arr[1]}"                    # use the first line.
. <(printf '%s\n' "${arr[@]:2}")        # source the rest.