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unix2plan9: du -> walk

we have walk now

--- a/unix2plan9.md

+++ b/unix2plan9.md

@@ -168,12 +168,12 @@

 		<td><code>whois $user</code></td>

 	</tr><tr>

 		<td rowspan=2><code>find</code></td>

-		<td>By name: <code>du -a | grep pattern</code> and <code>grep pattern `{du -a root}</code></td>

+		<td>By name: <code>walk | grep pattern</code> and <code>grep pattern `{walk -f root}</code></td>

 	</tr><tr>

-		<td>By content pattern: <code>grep -n pattern `{du -a root | awk '{print $2}'}</code></td>

+		<td>By content pattern: <code>grep -n pattern `{walk -f}</code></td>

 	</tr><tr>

 		<td><code>find -exec cp '{}' x ';'</code></td>

-		<td><code>cp `{ du -a | grep pattern } x</code></td>

+		<td><code>cp `{ walk | grep pattern } x</code></td>

 	</tr><tr>

 		<td><code>cut</code></td>

 		<td><code>awk -F …</code></td>

-- 

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