diff --git a/plugins/available/base.plugin.bash b/plugins/available/base.plugin.bash
index ea02bb7b..c8ccf574 100644
--- a/plugins/available/base.plugin.bash
+++ b/plugins/available/base.plugin.bash
@@ -3,11 +3,50 @@ about-plugin 'miscellaneous tools'
 
 function ips ()
 {
-    about 'display all ip addresses for this host'
+    about 'display all IPv4/6 addresses for this host'
     group 'base'
-    ifconfig | grep "inet " | awk '{ print $2 }'
+
+    mode=4
+    if [ -n "$1" ]; then
+        case "$1" in
+            -4) ;;
+            -6) mode=6 ;;
+            -a) mode=both ;;
+            -h) echo "Usage ips [-4|-6|-a]"
+               echo " -4    list only IPv4 addresses"
+               echo " -6    list only IPv6 addresses"
+               echo " -a    list both IPv4 and IPv6 addresses"
+               return
+               ;;
+            *) echo "Illegal option $1"
+               echo "Only -4, -6 and -a options are allowed"
+               return 1
+               ;;
+        esac
+    fi
+
+    token="inet"
+    case $mode in
+        4) ;;
+        6) token="${token}6" ;;
+        both) token="${token}6?" ;;
+    esac
+    case "$OSTYPE" in
+        darwin*)
+            ifconfig | grep -E "${token} " | awk '{ print $2 }'
+            ;;
+
+        # ifconfig is not available for users on modern linux distributions, 
+        # also it uses a slightly different format.
+        # Use ip instead.
+        linux*)
+            ip ad | grep -E "${token} " | awk '{ sub(/\/.*$/,"",$2); print $2}'
+            ;;
+    esac
 }
 
+alias ips6='ips -6'
+
 function down4me ()
 {
     about 'checks whether a website is down for you, or everybody'
@@ -153,7 +192,7 @@ function usage ()
 
 if [ ! -e $BASH_IT/plugins/enabled/todo.plugin.bash ]; then
 # if user has installed todo plugin, skip this...
-    function t ()
+    function __simpletodo ()
     {
         about 'one thing todo'
         param 'if not set, display todo item'
@@ -164,6 +203,9 @@ if [ ! -e $BASH_IT/plugins/enabled/todo.plugin.bash ]; then
             echo "$*" > ~/.t
         fi
     }
+    if ! alias | grep -q ' t='; then
+        alias t=__simpletodo
+    fi
 fi
 
 function command_exists ()
diff --git a/plugins/available/extract.plugin.bash b/plugins/available/extract.plugin.bash
index bb520451..3389f2e0 100644
--- a/plugins/available/extract.plugin.bash
+++ b/plugins/available/extract.plugin.bash
@@ -6,20 +6,35 @@ extract () {
     echo "Error: No file specified."
     return 1
   fi
-	if [ -f $1 ] ; then
-		case $1 in
-			*.tar.bz2) tar xvjf $1   ;;
-			*.tar.gz)  tar xvzf $1   ;;
-			*.bz2)     bunzip2 $1    ;;
-			*.rar)     unrar x $1    ;;
-			*.gz)      gunzip $1     ;;
-			*.tar)     tar xvf $1    ;;
-			*.tbz2)    tar xvjf $1   ;;
-			*.tgz)     tar xvzf $1   ;;
-			*.zip)     unzip $1      ;;
-			*.Z)       uncompress $1 ;;
-			*.7z)      7z x $1       ;;
-			*)         echo "'$1' cannot be extracted via extract" ;;
+	if [ -f "$1" ] ; then
+		case "$1" in
+			*.tar.bz2)  tar xvjf "$1"             ;;
+			*.tar.gz)   tar xvzf "$1"             ;;
+			*.tar.xz|*.txz)
+                                    xz -dc "$1" | tar xvf -   ;;
+			*.tar.lzma) ( xz -dc "$1" || lzma -dc "$1" ) | tar xvf - ;;
+			*.tar.lzop) lzop -d -c "$1" | tar xvf - ;;
+			*.tar.lzip) lzip -d -c "$1" | tar xvf - ;;
+			*.cpio.gz|*.cpio.Z)
+				    gzip -dc "$1" | cpio -itvm ;;
+			*.cpio.bz2) bzip2 -dc "$1" | cpio -itvm ;;
+			*.cpio.xz)  xz -dc "$1" | cpio -itvm  ;;
+			*.cpio)     cpio -itvm < "$1"         ;;
+			*.bz2)      bunzip2 "$1"              ;;
+			*.rar)      unrar x "$1"              ;;
+			*.gz)       gunzip "$1"               ;;
+			*.tar)      tar xvf "$1"              ;;
+			*.tbz2)     tar xvjf "$1"             ;;
+			*.tgz)      tar xvzf "$1"             ;;
+			*.zip)      unzip "$1"                ;;
+			*.jar)      unzip "$1"                ;;
+			*.Z)        (uncompress "$1" || gzip -dc "$1") ;;
+			*.7z)       7z x "$1"                 ;;
+			*.lzma)     (xz -dc "$1" || lzma -d "$1") ;;
+			*.lzop)     lzop -d "$1"              ;;
+			*.lzip)     lzip -d "$1"              ;;
+			*.xz)       xz -d "$1"                ;;
+			*)          echo "'$1' cannot be extracted via extract" ;;
 		esac
 	else
 		echo "'$1' is not a valid file"