whereis, xar, yank: move to common (#6552)

pages/common/whereis.md

@@ -0,0 +1,27 @@
+# whereis
+
+> Locate the binary, source, and manual page files for a command.
+
+- Locate binary, source and man pages for ssh:
+
+`whereis {{ssh}}`
+
+- Locate binary and man pages for ls:
+
+`whereis -bm {{ls}}`
+
+- Locate source of gcc and man pages for Git:
+
+`whereis -s {{gcc}} -m {{git}}`
+
+- Locate binaries for gcc in `/usr/bin/` only:
+
+`whereis -b -B {{/usr/bin/}} -f {{gcc}}`
+
+- Locate unusual binaries (those that have more or less than one binary on the system):
+
+`whereis -u *`
+
+- Locate binaries that have unusual manual entries (binaries that have more or less than one manual installed):
+
+`whereis -u -m *`