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