pacman: added pacman notes

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diff --git a/src/tools/pacman.md b/src/tools/pacman.md
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+# pacman(1)
+
+## Remote package repositories
+
+```text
+pacman -Sy              refresh package database
+pacman -S <pkg>         install pkg
+pacman -Ss <regex>      search remote package database
+pacman -Si <pkg>        get info for pkg
+pacman -Su              upgrade installed packages
+pacman -Sc              clean local package cache
+```
+
+## Remove packages
+
+```text
+pacman -Rsn <pkg>               uninstall package and unneeded deps + config files
+```
+
+## Local package database
+
+Local package database of installed packages.
+
+```text
+pacman -Q               list all installed packages
+pacman -Qs <regex>      search local package database
+pacman -Ql <pkg>        list files installed by pkg
+pacman -Qo <file>       query package that owns file
+pacman -Qe              only list explicitly installed packages
+```
+
+## Local file database
+
+Local file database which allows to search packages owning certain files.
+Also searches non installed packages, but database must be synced.
+
+```text
+pacman -Fy              refresh file database
+pacman -Fl <pkg>        list files in pkg (must not be installed)
+pacman -Fx <regex>      search 
+```
+
+## Hacks
+
+Uninstall all orphaned packages (including config files) that were installed as
+dependencies.
+```text
+pacman -Rsn $(pacman -Qqtq)
+```
+
+List explicitly installed packages that are not required as dependency by any
+package and sort by size.
+```text
+pacman -Qetq | xargs pacman -Qi |
+    awk '/Name/ { name=$3 }
+         /Installed Size/ { printf "%8.2f%s %s\n", $4, $5, name }' |
+    sort -h
+```