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If you are reading the article as you were searching for an answer to the question mentioned in the subject, that means you are not a regular user of “man” command or you were not satisfied with the info given in man page of aptitude command. The following is an excerpt from the man page of aptitude command and hence dont bother to read if you have already gone through it thorughly. If you have not, then from next time spend more time reading man pages. They are the best tutorials.

However here is the excerpt:::

Unless you pass the -F option, the output of aptitude search will look something like this:

i apt – Advanced front-end for dpkg
pi apt-build – frontend to apt to build, optimize and in
cp apt-file – APT package searching utility — command-
ihA raptor-utils – Raptor RDF Parser utilities

Each search result is listed on a separate line. The first character of each line indicates the current state
of the package: the most common states are p, meaning that no trace of the package exists on the system, c,
meaning that the package was deleted but its configuration files remain on the system, i, meaning that the
package is installed, and v, meaning that the package is virtual. The second character indicates the stored
action (if any; otherwise a blank space is displayed) to be performed on the package, with the most common
actions being i, meaning that the package will be installed, d, meaning that the package will be deleted, and
p, meaning that the package and its configuration files will be removed. If the third character is A, the
package was automatically installed.

For a complete list of the possible state and action flags, see the section “Accessing Package Information” in
the aptitude reference guide. To customize the output of search, see the command-line options -F and –sort.

If you know the name of the function and you want to see the man page for that function, then you can use the following command.

perldoc -f “function name” //without quotes

for example,

perldoc -f our
perldoc -f sysopen

you need to set the MANPATH variable to be able to access man pages which are not present in standard path. If for temporary purpose, you can just export MANPATH by the following command.
$export MANPATH=$MANPATH:/the/path/of/the/man/page/

Dont keep any space on either sides of “=” as it gives error as
“bash: export: `=’: not a valid identifier”.

To add permanently, you need to make changes in /etc/login.defs file. I am looking into it and will update this post as soon as i come to know of it

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