Add emerge.md

linux/emerge.md

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+# emerge
+
+> Gentoo Linux package manager utility
+
+- synchronize all packages
+
+`emerge --sync`
+
+- update all packages, including dependencies
+
+`emerge -uDNav @world`
+
+- resume a failed updated, skipping the failing package
+
+`emerge --resume --skipfirst`
+
+- install a new package, with confirmation
+
+`emerge -av {{package-name}}`
+
+- remove a package, with confirmation
+
+`emerge -Cav {{package-name}}`
+
+- remove orphaned packages (that were installed only as dependencies)
+
+`emerge -avc`
+
+- search the package database for a keyword
+
+`emerge -S {{keyword}}`