diff --git a/commonsh/10_utility b/commonsh/10_utility
index 4fc26d3..65d69c4 100755
--- a/commonsh/10_utility
+++ b/commonsh/10_utility
@@ -31,11 +31,14 @@ extract ()
       *.tar)
          tar xf "${1}"
       ;;
-      *.tar.gz|*.tgz|*.tar.z)
-         tar zxf "${1}"
+      *.tar.gz|*.tgz)
+         gunzip -c "${1}" | tar xf -
+      ;;
+      *.tar.z)
+         uncompress -c "${1}" | tar xf -
       ;;
       *.tar.bz2|*.tbz2)
-         tar jxf "${1}"
+         bzcat "${1}" | tar xf -
       ;;
       *.zip|*.jar)
          unzip -qo "${1}"
diff --git a/screenrc b/screenrc
index 1b50d9f..54fae4b 100644
--- a/screenrc
+++ b/screenrc
@@ -7,6 +7,9 @@ vbell on
 # default scrollback to 5000 lines
 defscrollback 5000
 
+# when in history mode, use incremental searching
+markkeys "^S=/:^R=?"
+
 # turn off visual bell
 termcapinfo * vb@