Setting an argument with bash [duplicate]

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The problem is that quotes are not processed after variable substitution. So it looks like you’re trying to define a macro named '_transaction_color.

Try using an array:

INSTALL_OPT=(-Uvh --define '_transaction_color 3')

then:

"$INSTALL_CMD" "${INSTALL_OPT[@]}" myPackage.rpm

It’s important to put ${INSTALL_OPT[@]} inside double quotes to get the requoting.

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