How do I get value of variable from file using shell script?

Question

There is a file post_check.ini I need the value set for:

Max_value=2

How would I get the value 2 from Max_v

Answer 1

You might find it useful to use proper config file parser. Given the following .ini file:

$ cat post_check.ini
[section 1]
Max_value=123
[section 2]
Max_value=456

The following python script will print 123:

import ConfigParser, os
config = ConfigParser.ConfigParser()
config.read('post_check.ini')
print config.get('section 1','Max_value')

This is most reliable and modifiable way to go if you need to work with config files.

Answer 2

I recommend using crudini which is a dedicated tool to manipulate ini files from shell

value=$(crudini --get /usr/post_check.ini section Max_value)

Details on usage and download at: http://www.pixelbeat.org/programs/crudini/

Answer 3

Max_value=$(sed -n '/^Max_value=\([0-9]*\)$/s//\1/p' post_check.ini)

Answer 4

try

grep -Po '(?<=Max_value=).*' post_check.ini