diff --git a/SysadminTips.page b/SysadminTips.page
index 72bcf75..9d6fed4 100644
--- a/SysadminTips.page
+++ b/SysadminTips.page
@@ -96,9 +96,12 @@ sed -ri 's/^\s*[0-9]+\s*; serial/\t\t\t 2017041010\t ; serial/' db.*
 After Debian/Ubuntu upgrade, merge local config files according to config files shipped in packages.
 
 ```
-for file in $(find /etc -iname '*.dpkg-dist'); do vimdiff ${file%%.dpkg-dist} $file; done
-for file in $(find /etc -iname '*.dpkg-old'); do vimdiff ${file%%.dpkg-old} $file; done
-for file in $(find /etc -iname '*.ucf-dist'); do vimdiff ${file%%.ucf-dist} $file; done
+for file in $(find /etc -iname '*.dpkg-dist'); do vimdiff ${file%%.dpkg-dist} $file; rm $file; done
+for file in $(find /etc -iname '*.dpkg-old'); do vimdiff ${file%%.dpkg-old} $file; rm $file; done
+for file in $(find /etc -iname '*.dpkg-new'); do vimdiff ${file%%.dpkg-new} $file; rm $file; done
+for file in $(find /etc -iname '*.ucf-dist'); do vimdiff ${file%%.ucf-dist} $file; rm $file; done
+for file in $(find /etc -iname '*.ucf-old'); do vimdiff ${file%%.ucf-old} $file; rm $file; done
+for file in $(find /etc -iname '*.ucf-new'); do vimdiff ${file%%.ucf-new} $file; rm $file; done
 ```
 
 Debug php with strace and php-cgi (especially useful for wp multisites).