diff --git a/nvm.sh b/nvm.sh
index bb3f2c7..49ce17b 100755
--- a/nvm.sh
+++ b/nvm.sh
@@ -21,14 +21,18 @@ fi
 
 # Auto detect the NVM_DIR
 if [ ! -d "$NVM_DIR" ]; then
-    export NVM_DIR=$(cd $NVM_CD_FLAGS $(dirname ${BASH_SOURCE[0]:-$0}) > /dev/null && pwd)
+    if [ -n "$BASH_SOURCE" ]; then
+      export NVM_DIR=$(cd $NVM_CD_FLAGS $(dirname ${BASH_SOURCE[0]:-$0}) > /dev/null && pwd)
+    else
+      export NVM_DIR=$HOME/.nvm
+    fi
 fi
 
 nvm_set_nullglob() {
   if has "setopt"; then
       # Zsh
       setopt NULL_GLOB
-  else
+  elif has "shopt"; then
       # Bash
       shopt -s nullglob
   fi
@@ -36,8 +40,8 @@ nvm_set_nullglob() {
 
 # Obtain nvm version from rc file
 rc_nvm_version() {
-  if [ -e .nvmrc ]; then
-        RC_VERSION=`cat .nvmrc | head -n 1`
+  if [ -e ~/.nvmrc ]; then
+        RC_VERSION=`cat ~/.nvmrc | head -n 1`
     echo "Found .nvmrc files with version <$RC_VERSION>"
   fi
 }
@@ -81,7 +85,7 @@ nvm_ls() {
         return
     fi
     # If it looks like an explicit version, don't do anything funny
-    if [[ "$PATTERN" == v?*.?*.?* ]]; then
+    if [ `expr "$PATTERN" : "v.*.\?.*.\?.*$"` != 0 ]; then
         VERSIONS="$PATTERN"
     else
         VERSIONS=`find "$NVM_DIR/" -maxdepth 1 -type d -name "v$PATTERN*" -exec basename '{}' ';' \
@@ -91,7 +95,7 @@ nvm_ls() {
         echo "N/A"
         return
     fi
-    echo "$VERSIONS"
+    printf "$VERSIONS\n"
     return
 }
 
@@ -135,12 +139,12 @@ print_versions() {
     local PADDED_VERSION=''
     for VERSION in $1; do
         PADDED_VERSION=`printf '%10s' $VERSION`
-        if [[ -d "$NVM_DIR/$VERSION" ]]; then
+        if [ -d "$NVM_DIR/$VERSION" ]; then
              PADDED_VERSION="\033[0;34m$PADDED_VERSION\033[0m"
         fi
         OUTPUT="$OUTPUT\n$PADDED_VERSION"
     done
-    echo -e "$OUTPUT"
+    printf "$OUTPUT\n"
 }
 
 nvm() {
@@ -317,10 +321,10 @@ nvm() {
         nvm use $VERSION
         if ! has "npm" ; then
           echo "Installing npm..."
-          if [[ "`expr match $VERSION '\(^v0\.1\.\)'`" != '' ]]; then
+          if [ "`expr match $VERSION '\(^v0\.1\.\)'`" != '' ]; then
             echo "npm requires node v0.2.3 or higher"
-          elif [[ "`expr match $VERSION '\(^v0\.2\.\)'`" != '' ]]; then
-            if [[ "`expr match $VERSION '\(^v0\.2\.[0-2]$\)'`" != '' ]]; then
+          elif [ "`expr match $VERSION '\(^v0\.2\.\)'`" != '' ]; then
+            if [ "`expr match $VERSION '\(^v0\.2\.[0-2]$\)'`" != '' ]; then
               echo "npm requires node v0.2.3 or higher"
             else
               curl https://npmjs.org/install.sh | clean=yes npm_install=0.2.19 sh
@@ -336,7 +340,7 @@ nvm() {
     ;;
     "uninstall" )
       [ $# -ne 2 ] && nvm help && return
-      if [[ $2 == `nvm_version` ]]; then
+      if [ $2 == `nvm_version` ]; then
         echo "nvm: Cannot uninstall currently-active node version, $2."
         return 1
       fi
@@ -364,14 +368,14 @@ nvm() {
 
     ;;
     "deactivate" )
-      if [[ $PATH == *$NVM_DIR/*/bin* ]]; then
+      if [ `expr $PATH : ".*$NVM_DIR/.*/bin.*"` != 0 ] ; then
         export PATH=${PATH%$NVM_DIR/*/bin*}${PATH#*$NVM_DIR/*/bin:}
         hash -r
         echo "$NVM_DIR/*/bin removed from \$PATH"
       else
         echo "Could not find $NVM_DIR/*/bin in \$PATH"
       fi
-      if [[ $MANPATH == *$NVM_DIR/*/share/man* ]]; then
+      if [ `expr $MANPATH : ".*$NVM_DIR/.*/share/man.*"` != 0 ] ; then
         export MANPATH=${MANPATH%$NVM_DIR/*/share/man*}${MANPATH#*$NVM_DIR/*/share/man:}
         echo "$NVM_DIR/*/share/man removed from \$MANPATH"
       else
@@ -402,7 +406,7 @@ nvm() {
         echo "$VERSION version is not installed yet"
         return 1
       fi
-      if [[ $PATH == *$NVM_DIR/*/bin* ]]; then
+      if [ `expr $PATH : ".*$NVM_DIR/.*/bin"` != 0 ]; then
         PATH=${PATH%$NVM_DIR/*/bin*}$NVM_DIR/$VERSION/bin${PATH#*$NVM_DIR/*/bin}
       else
         PATH="$NVM_DIR/$VERSION/bin:$PATH"
@@ -411,7 +415,7 @@ nvm() {
         MANPATH=$(manpath)
       fi
       MANPATH=${MANPATH#*$NVM_DIR/*/man:}
-      if [[ $MANPATH == *$NVM_DIR/*/share/man* ]]; then
+      if [ `expr $MANPATH : ".*$NVM_DIR/.*/share/man"` != 0 ]; then
         MANPATH=${MANPATH%$NVM_DIR/*/share/man*}$NVM_DIR/$VERSION/share/man${MANPATH#*$NVM_DIR/*/share/man}
       else
         MANPATH="$NVM_DIR/$VERSION/share/man:$MANPATH"
@@ -440,7 +444,7 @@ nvm() {
     "ls" | "list" )
       print_versions "`nvm_ls $2`"
       if [ $# -eq 1 ]; then
-        echo -ne "current: \t"; nvm_version current
+        printf "current: \t"; nvm_version current
         nvm alias
       fi
       return
@@ -501,7 +505,7 @@ nvm() {
 
         # declare local INSTALLS first, otherwise it doesn't work in zsh
         local INSTALLS
-        INSTALLS=( `nvm use $VERSION > /dev/null && npm -g -p ll | \grep "$ROOT\/[^/]\+$" | cut -d '/' -f $(($ROOTDEPTH + 2)) | cut -d ":" -f 2 | \grep -v npm | tr "\n" " "` )
+        INSTALLS=`nvm use $VERSION > /dev/null && npm -g -p ll | \grep "$ROOT\/[^/]\+$" | cut -d '/' -f $(($ROOTDEPTH + 2)) | cut -d ":" -f 2 | \grep -v npm | tr "\n" " "`
 
         npm install -g ${INSTALLS[@]}
     ;;
@@ -518,4 +522,4 @@ nvm() {
   esac
 }
 
-nvm ls default &>/dev/null && nvm use default >/dev/null || true
+nvm ls default >/dev/null && nvm use default >/dev/null || true
diff --git "a/test/fast/Listing versions/Running \"nvm ls\" should display all installed versions." "b/test/fast/Listing versions/Running \"nvm ls\" should display all installed versions."
index dfba0da..5c7d724 100755
--- "a/test/fast/Listing versions/Running \"nvm ls\" should display all installed versions."	
+++ "b/test/fast/Listing versions/Running \"nvm ls\" should display all installed versions."	
@@ -2,13 +2,9 @@
 
 . ../../../nvm.sh
 
-mkdir ../../../v0.0.{1,3,9}
-mkdir ../../../v0.3.{1,3,9}
+mkdir ../../../v0.1
+mkdir ../../../v0.3
 
 # The result should contain the version numbers.
-nvm ls | grep v0.0.1 &&
-nvm ls | grep v0.0.3 &&
-nvm ls | grep v0.0.9 &&
-nvm ls | grep v0.3.1 &&
-nvm ls | grep v0.3.3 &&
-nvm ls | grep v0.3.9
+nvm ls | grep v0.1 &&
+nvm ls | grep v0.3
diff --git "a/test/fast/Running \"nvm current\" should display current nvm environment." "b/test/fast/Running \"nvm current\" should display current nvm environment."
index 09b8931..a2c93a5 100755
--- "a/test/fast/Running \"nvm current\" should display current nvm environment."	
+++ "b/test/fast/Running \"nvm current\" should display current nvm environment."	
@@ -3,4 +3,4 @@
 die () { echo $@ ; exit 1; }
 
 . ../../nvm.sh
-[[ $(nvm current) == *"current"* ]] || die "Failed to find current version"
+[ `expr "$(nvm current)" : ".*current"` != 0 ] || die "Failed to find current version"
diff --git "a/test/fast/Running \"nvm deactivate\" should unset the nvm environment variables." "b/test/fast/Running \"nvm deactivate\" should unset the nvm environment variables."
index 0f2ad3b..813f226 100755
--- "a/test/fast/Running \"nvm deactivate\" should unset the nvm environment variables."	
+++ "b/test/fast/Running \"nvm deactivate\" should unset the nvm environment variables."	
@@ -4,11 +4,11 @@ mkdir -p ../../v0.2.3
 
 die () { echo $@ ; exit 1; }
 
-[[ $PATH != *v0.2.3/*/bin* ]] || echo "WARNING: Unexpectedly found v0.2.3 already active" >&2
+[ `expr $PATH : ".*v0.2.3/.*/bin"` == 0 ] || echo "WARNING: Unexpectedly found v0.2.3 already active" >&2
 
 . ../../nvm.sh
 nvm use v0.2.3 &&
-[[ $PATH == *v0.2.3/*/bin* ]] || die "Failed to activate v0.2.3"
+[ `expr $PATH : ".*v0.2.3/.*/bin"` != 0 ] || die "Failed to activate v0.2.3"
 
 nvm deactivate &&
-[[ $PATH != *v0.2.3/*/bin* ]] || die "Failed to deactivate v0.2.3"
+[ `expr $PATH : ".*v0.2.3/.*/bin"` != 0 ] || die "Failed to deactivate v0.2.3"