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Output: Version 3.2-0 (for example if you type # aptitude show bash | grep Vers
Depends on the language of your distribution, because the name of the word "Version" in other languages may be different.
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But this is not correct.
The command show you what could be installed (if the metadata is up-to-date).
What you want is:
dpkg -l ${PROGRAM}or
apt-get policy ${PROGRAM}apt-get policyis not correct either. Proper ways to do this include :
dpkg -l bash | grep "^ii"apt-cache policy bash | grep Installedok, you are right, shows you the version you have installed, if you have installed, and shows you the version that should be installed if not already installed.
Sorry, I know that my English is very bad.