Monday, November 15, 2021

[SOLVED] finding substring in string in shell script not working

Issue

I have a test.cfg file whose contents are:

product_identifier=XR656_HD;G6_656
program_family=STR

and a script file as

#!/bin/bash

CONFIG_FILE="test.cfg"
getValueforKeyInProdConfig ()
{
        key=$1
        if [ -e $CONFIG_FILE ]; then
                value=`cat  $CONFIG_FILE | grep $key | cut -d "=" -f2 | tr -d '\r'`
                echo "$value"
        else
                echo ""
        fi
}

product_identifier="$(getValueforKeyInProdConfig "product_identifier")"
program_family="$(getValueforKeyInProdConfig "program_family")"

echo "product_identifier=$product_identifier"
echo "program_family=$program_family"

if [[ ( $program_family == "STR" ) && ( ($product_identifier == *"G6_656"*) || ($product_identifier == *"G6_646"*) ) ]]; then
        echo "found string"
else
        echo "unknown"
fi

But the output is:

product_identifier=XR656_HD;G6_656
program_family=STR
unknown

I am expecting the output to be

found string

How should I compare substring in bash to make the script working


Solution

Why don't you just source your CONFIG_FILE?

$ cat test.cfg
product_identifier='XR656_HD;G6_656'
program_family=STR

Script

#!/bin/bash

CONFIG_FILE="test.cfg"
. "$CONFIG_FILE"

echo product_identifier=$product_identifier
echo program_family=$program_family

[[ $program_family     == "STR"       ]] && \
[[ $product_identifier =~ .*G6_6[45]6 ]] && \
echo "found string" || echo "unknown"

Testing

$ ./test 
product_identifier=XR656_HD;G6_646
program_family=STR
found string

$ ./test 
product_identifier=XR656_HD;G6_656
program_family=STR
found string

$ ./test 
product_identifier=XR656_HD;G6_676
program_family=STR
unknown

$ ./test
product_identifier=XR656_HD;G6_656
program_family=fail
unknown


Answered By - Ivan
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