Debian Handbook/05_packaging-system — Polish @ Hosted Weblate: <computeroutput>$ </computeroutput><userinput>dpkg --compare-versions 2.6.0~pre3-1 lt 2.6.0-1</userinput> <computeroutput>$ </computeroutput><userinput>echo $?</userinput> <computeroutput>0</computeroutput>

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	Since <command>dpkg</command> is the program for handling Debian packages, it also provides the reference implementation of the logic of comparing version numbers. This is why it has a <literal>--compare-versions</literal> option, usable by external programs (especially configuration scripts executed by <command>dpkg</command> itself). This option requires three parameters: a version number, a comparison operator, and a second version number. The different possible operators are <literal>lt</literal> (strictly less than), <literal>le</literal> (less than or equal to), <literal>eq</literal> (equal), <literal>ne</literal> (not equal), <literal>ge</literal> (greater than or equal to), and <literal>gt</literal> (strictly greater than). If the comparison is correct, <command>dpkg</command> returns 0 (success); if not, it gives a non-zero return value (indicating failure).
	<computeroutput>$ </computeroutput><userinput>dpkg --compare-versions 1.2-3 gt 1.1-4</userinput> <computeroutput>$ </computeroutput><userinput>echo $?</userinput> <computeroutput>0 $ </computeroutput><userinput>dpkg --compare-versions 1.2-3 lt 1.1-4</userinput> <computeroutput>$ </computeroutput><userinput>echo $?</userinput> <computeroutput>1 $ </computeroutput><userinput>dpkg --compare-versions 2.6.0pre3-1 lt 2.6.0-1</userinput> <computeroutput>$ </computeroutput><userinput>echo $?</userinput> <computeroutput>1</computeroutput>
	Note the unexpected failure of the last comparison: for <command>dpkg</command>, <literal>pre</literal>, usually denoting a pre-release, has no particular meaning, and this program compares the alphabetic characters in the same way as the numbers (a < b < c ...), in alphabetical order. This is why it considers “<literal>0pre3</literal>” to be greater than “<literal>0</literal>”. When we want a package's version number to indicate that it is a pre-release, we use the tilde character, “<literal>~</literal>”:
	<primary><literal>~</literal></primary>	<primary><literal>Breaks</literal>, pole nagłówkowe</primary>
	<primary>tilde, usage</primary><secondary>in versions</secondary>	<primary>pakiet</primary><secondary>całkowite usuwanie</secondary>
	<computeroutput>$ </computeroutput><userinput>dpkg --compare-versions 2.6.0~pre3-1 lt 2.6.0-1</userinput> <computeroutput>$ </computeroutput><userinput>echo $?</userinput> <computeroutput>0</computeroutput>
	<command>dpkg</command>'s Log File
	<primary><command>dpkg</command></primary><secondary><filename>/var/log/dpkg.log</filename></secondary>	<primary><command>dpkg</command></primary><secondary>wewnętrzne działanie</secondary>
	<primary><filename>/var</filename></primary><secondary><filename>/var/log/dpkg.log</filename></secondary>	<primary><command>dpkg</command></primary><secondary>wewnętrzne działanie</secondary>
	<command>dpkg</command> keeps a log of all of its actions in <filename>/var/log/dpkg.log</filename>. This log is extremely verbose, since it details every one of the stages through which packages handled by <command>dpkg</command> go. In addition to offering a way to track dpkg's behavior, it helps, above all, to keep a history of the development of the system: one can find the exact moment when each package has been installed or updated, and this information can be extremely useful in understanding a recent change in behavior. Additionally, all versions being recorded, it is easy to cross-check the information with the <filename>changelog.Debian.gz</filename> for packages in question, or even with online bug reports.
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stan099

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Previous translation was " <computeroutput>$ </computeroutput><userinput>dpkg --compare-versions 2.6.0~pre3-1 lt 2.6.0-1</userinput> <computeroutput>$ </computeroutput><userinput>echo $?</userinput> <computeroutput>0</computeroutput>".

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