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

pages/common/whereis.md

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+# 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 *`

pages/common/xar.md

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+# xar
+
+> Manage .xar archives.
+
+- Create a xar archive of all files in a given directory:
+
+`xar -cf {{archive.xar}} {{path/to/directory}}`
+
+- List the contents of a given xar archive:
+
+`xar -tf {{archive.xar}}`
+
+- Extract the contents of a given xar archive to the current directory:
+
+`xar -xf {{archive.xar}}`

pages/common/yank.md

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+# yank
+
+> Read input from stdin and display a selection interface that allows a field to be selected and copied to the clipboard.
+
+- Yank using the default delimiters (\f, \n, \r, \s, \t):
+
+`{{sudo dmesg}} | yank`
+
+- Yank an entire line:
+
+`{{sudo dmesg}} | yank -l`
+
+- Yank using a specific delimiter:
+
+`{{echo hello=world}} | yank -d {{=}}`
+
+- Only yank fields matching a specific pattern:
+
+`{{ps ux}} | yank -g "{{[0-9]+}}"`