Merge pull request #149 from Gubolin/master

aptitude.md

pages/common/apropos.md

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+# apropos
+
+> Search in manpages
+> for example to find a new command
+
+- search for keyword
+
+`apropos {{regular_expression}}`
+
+- search without restricting output to terminal width
+
+`apropos -l {{regular_expression}}`

pages/linux/aptitude.md

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+# aptitude
+
+> Debian and Ubuntu package management utility
+
+- Synchronize list of packages and versions available. This should be run first, before running subsequent aptitude commands.
+ 
+`aptitude update`
+
+- install a new package
+
+`aptitude install {{package}}`
+
+- search for a package
+
+`aptitude search {{package}}`
+
+- remove a package
+ 
+`aptitude remove {{package}}`
+
+- Upgrade installed packages to newest available versions
+
+`aptitude upgrade`
+
+- Upgrade installed packages (like `aptitude upgrade`) including removing obsolete packages and installing additional packages to meet new package dependencies. 
+
+`aptitude full-upgrade`