mjhjmtu

It is a bit complicated. i have a configuration file. it looks something like this.

customer="airtel"
model_name=fast
programmer_typ_of="dev"

Now the 1st column contains all the keys and whatever is after the = is the value of each key. It is like this format:

key=value

How can I write a function where it will call such a file and store each key and value to two separate arrays where same position of each array will contain corresponding key and value. Please note that I cannot use the name of my key in the function anywhere neither I can grep using the exact key name. Alternatively I have thought of a way of solving this by assigning row numbers to the configuration file and the 'cut' each key and value pairs based on using grep in a loop to find the individual row numbers. something like this :

function parse() grep ^$i 

If you could tell me what is wrong in this function or if you could suggest some other method of getting separate key value pairs in different arrays.

With awk:

eval $(awk -F= -v i=0 'print "arr1["i"]="$1";arr2["i"]="$2;i++' model.conf)

With = as field seperator and variable i with initial value 0, awk will print "arr1["i"]="$1";arr2["i"]="$2 for each line where $1 will have the key and $1 will have the value and increment i for each line.

awk -F= -v i=0 'print "arr1["i"]="$1";arr2["i"]="$2;i++' model.conf O/P:

arr1[0]=customer;arr2[0]="airtel"
arr1[1]=model_name;arr2[1]=fast
arr1[3]=programmer_typ_of;arr2[3]="dev"

Then use eval on awk output to assign arrays.

You can parse it directly using the bash shell's built-in read function, by setting the field separator to =

while IFS== read -r name value; do 
 arr1+=("$name")
 arr2+=("$value") 
done < model.conf

The arrays will be zero indexed by default, i.e.

$ echo "$arr1[0]"
customer
$ echo "$arr2[0]"
"airtel"

Since variables (including arrays) have global scope unless explicitly declared as local, you may put the parse loop in a function if you wish. To illustrate:

#!/bin/bash

function parse() 
while IFS== read -r name value; do
 arr1+=("$name")
 arr2+=("$value")
done < model.conf


# call the function to extract key=value pairs from file to arrays
parse

# now we can use the arrays e.g.
for i in "$!arr1[@]"; do
 printf 'key: %stvalue: %sn' "$arr1[$i]" "$arr2[$i]"
done

Result

key: customer value: "airtel"
key: model_name value: fast
key: programmer_typ_of value: "dev"