A colleague asks which files the installed Debian package cron put on the system. Which command answers that?
LPIC-1 Exam 101-500, objective 102. Linux installation and package management easy
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How these questions are written — where each question comes from, what the verification ledger records, and what happens when one is found wrong.
The options
Correct dpkg -L cron
Correct. -L (--listfiles) prints the file list that dpkg recorded when the package was unpacked.
Not correct dpkg -l cron
Wrong. Lower-case -l lists matching packages with their status, version and one-line description, not their contents.
Not correct dpkg -S cron
Wrong direction. -S searches for the package that owns a given path; it answers the inverse question.
Not correct dpkg -c cron
Wrong. -c lists the contents of a .deb archive file and therefore expects a file name such as cron_3.0.deb, not an installed package name.
Why
dpkg keeps a file list per installed package under /var/lib/dpkg/info, and -L prints it. The case of the option matters: -l queries the package status list, -L the file list of one package. Anything that inspects an archive rather than the database, such as -c or -x, takes a path to a .deb file instead.
Where this comes from
- Cited
- manual page dpkg(1)
Practise this
Reading one question is not practice. The trainer will draw a short set from objective 102 and space the ones you get wrong.
More questions on this objective
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