linux - Unix: replace variable in file a with value in file b -

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i have 2 files in linux, in file there variables these:

${version} ${software_producer}

and values of these variables stored in file b:

version=1.0.1 software_producer=luc

now how can use command replace variables in file values in file b? sed able task? thanks.

a simple bash loop suffice: 

$ cat file 'a' has variable ${version}  , has also: ${software_producer} $ cat b version=1.0.1 software_producer=luc $ cat script.bash  #!/bin/bash while read line || [[ -n "$line" ]]     key=$(awk -f= '{print $1}' <<< "$line")     value=$(awk -f= '{print $2}' <<< "$line")     sed -i 's/${'"$key"'}/'"$value"'/g' done < b $ ./script.bash  $ cat file 'a' has variable 1.0.1  , has also: luc $

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