OpenWrt – Rev 1

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getvar() {
        eval "echo \"\${$1}\""
}

var2file() {
        local var
        eval "var=\"\${$1}\""
        if [ -n "$var" ]; then echo "$var" > "$2"; fi
}

isset() {
        local var
        eval "var=\"\${$1}\""
        [ -n "$var" ]
}