add strace

SysadminTips.page

@@ -1,3 +1,8 @@
+WTF is happening in apache (or other)? Let's strace all apache processes.  
+```
+# trace -p $(ps auwwwx | grep apache | tr -s '\t' ' ' | cut -d' ' -f2 | tr '\n' ' ' | sed 's/ / -p /g') -p 9999
+```
+
 WTF is happening? Let's tail all logs.
 
 ```