Shell file doesn't extract value properly [grep/cut] from file [bash] - bash

Question

I have a test.txt file which contains key value pair just like any other property file.
test.txt
Name="ABC"
Age="24"
Place="xyz"
i want to extract the value of different key's value into corresponding variables. For that i have written the following shell script
master.sh
file=test.txt
while read line; do
value1=`grep -i 'Name' $file|cut -f2 -d'=' $file`
value2=`grep -i 'Age' $file|cut -f2 -d'=' $file`
done <$file
but when i execute it; it doesnt run properly, giving me the entire line extracted by the grep part of the command as output. Can someone please point me to the error ?

Answer 1

If I understood your question correctly, the following Bash script should do the trick:
#!/bin/bash
IFS="="
while read k v ; do
test -z "$k" && continue # skip empty lines
declare $k=$v
done <test.txt
echo $Name
echo $Age
echo $Place
Why is that working? Most information can be retrieved from bash's man page:
IFS is the "Internal Field Separator" which is used by bash's 'read' command to separate fields in each line. By default, IFS separates along spaces, but it is redefined to separate along the equal sign. It is a bash-only solution similar to the 'cut' command, where you define the equal sign as delimiter ('-d =').
The 'read' builtin reads two fields from a line. As only two variables are provided (k and v), the first field ends up in k, all remaining fields (i.e. after the equal sign) end up in v.
As the comment states, empty lines are skipped, i.e. those where the k variable is emtpy (test -z).
'eval' is a bash builtin as well, which executes the arguments (but only after evaluating $k=$v), i.e. the eval statement becomes equivalent to Name="ABC" etc.
'<test.txt' after 'done' tells bash to read test.txt and to feed it line by line into the 'read' builtin further up.
The three 'echo' statements are simply to show that this solution did work.

Answer 2

The format or the file is valid sh syntax, so you could just source the file:
source test.txt
In any case, your code doesn't work because after the pipe you shouldn't specify the file again.
value1=$(grep -i 'Name' "$file" | cut -f2 -d'=')
would keep your logic

Answer 3

This is a comment, but the comment box does not allow formatting. Consider rewriting this:
while read line; do
value1=`grep -i 'Name' $file|cut -f2 -d'=' $file`
value2=`grep -i 'Age' $file|cut -f2 -d'=' $file`
done <$file
as:
while IFS== read key value; do
case $key in
Name|name) value1=$value;;
Age|age) value2=$value;;
esac;
done < $file
Parsing the line multiple times via cut is inefficient. This is slightly different than your version, since the comparison is case sensitive, but that is easily fixed if necessary. For example, you could preprocess the input file and convert everything to lower case. You can do the preprocessing on the fly, but be aware that this will put your while loop in a subprocess which will require some additional care (since the variable definitions will end with the pipeline), but that is not significant. But running the entire file through grep twice for each line of the file is O(n^2), and ghastly! (Why are you reading the entire file anyway instead of just echoing the line ?)