-weberr="/var/log/httpd/error/klokan.error_log"
-if [ -f "$weberr" ];then alias weberr='tail "$weberr"';fi
-weblog="/var/log/httpd/klokan.access_log"
-if [ -f "$weblog" ];then alias weblog='tail -n 20000 "$weblog"|grep "\\(~\\|%7[eE]\\)short"';fi
+# '2>/dev/null' to prevent: unalias: x: not found
+unalias 2>/dev/null cp # -i
+unalias 2>/dev/null mv # -i
+unalias 2>/dev/null rm # -i
+unalias 2>/dev/null df # -h
+unalias 2>/dev/null du # -h