diff --git a/VERSION b/VERSION
index 5b09c67..a970716 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.0.14
+1.0.15
diff --git a/scripts/completion b/scripts/completion
index 9c92bc8..8d177ff 100644
--- a/scripts/completion
+++ b/scripts/completion
@@ -1,7 +1,7 @@
+. $GVM_ROOT/scripts/functions/tools
+
 _gvm() 
 {
-	LS_PATH=`which ls` || return 1
-
 	local cur prev opts base
 	COMPREPLY=()
 	cur="${COMP_WORDS[COMP_CWORD]}"
@@ -58,7 +58,7 @@ _gvm()
 		install)
 			[ ! -d $GVM_ROOT/archive/go ] && return 1
 			[[ $COMP_CWORD > 2 ]] && return 1
-			local version=$(for x in `hg tags -R $GVM_ROOT/archive/go | awk '{print $1}' | grep -E "release|tip"`; do echo ${x} ; done )
+			local version=$(for x in `hg tags -R $GVM_ROOT/archive/go | awk '{print $1}' | $GREP_PATH -E "release|tip"`; do echo ${x} ; done )
 			COMPREPLY=( $(compgen -W "${version}" -- ${cur}) )
 			return 0
 		;;
diff --git a/scripts/diff b/scripts/diff
index 049f121..bff9230 100755
--- a/scripts/diff
+++ b/scripts/diff
@@ -1,11 +1,10 @@
 #!/bin/bash
 . $GVM_ROOT/scripts/functions
-LS_PATH=`which ls` || display_error "$LS_ERROR" || return 1
 
 version=$1
 
 if [ "$version" != "" ]; then
-	fuzzy_match=`$LS_PATH $GVM_ROOT/gos | sort | grep "$version" | head -n 1 | grep "$version"` ||
+	fuzzy_match=`$LS_PATH $GVM_ROOT/gos | $SORT_PATH | $GREP_PATH "$version" | $HEAD_PATH -n 1 | $GREP_PATH "$version"` ||
 		display_error "Invalid version $version"
 
 	foldername=$GVM_ROOT/gos/$fuzzy_match
diff --git a/scripts/env/pkgset-use b/scripts/env/pkgset-use
index 0af132a..88d2e8b 100644
--- a/scripts/env/pkgset-use
+++ b/scripts/env/pkgset-use
@@ -18,15 +18,13 @@ function display_message() {
 }
 
 function gvm_pkgset_use() {
-	LS_PATH=`which ls` || display_error "$LS_ERROR" || return 1
-
 	[[ "$1" != "" ]] ||
 		display_error "Please specify a package set" || return 1
 
 	[[ "$gvm_go_name" != "" ]] || 
 		display_error "No Go version selected" || return 1
 
-	fuzzy_match=`$LS_PATH $GVM_ROOT/environments | sort | grep "$gvm_go_name@" | grep "$1" | head -n 1` ||
+	fuzzy_match=`$LS_PATH $GVM_ROOT/environments | $SORT_PATH | $GREP_PATH "$gvm_go_name@" | $GREP_PATH "$1" | $HEAD_PATH -n 1` ||
 		display_error "Invalid package set" || return 1
 
 	export PATH=$GVM_PATH_BACKUP
diff --git a/scripts/env/use b/scripts/env/use
index 5a2d8c9..dd38798 100644
--- a/scripts/env/use
+++ b/scripts/env/use
@@ -1,5 +1,5 @@
 #!/bin/bash
-. $GVM_ROOT/scripts/function/errors
+. $GVM_ROOT/scripts/function/tools
 
 function display_error() {
 	tput sgr0
@@ -18,11 +18,9 @@ function display_message() {
 }
 
 function gvm_use() {
-	LS_PATH=`which ls` || display_error "$LS_ERROR" || return 1
-
 	[[ "$1" != "" ]] || 
 		display_error "Please specifiy the version" || return 1
-	fuzzy_match=`$LS_PATH $GVM_ROOT/gos | sort | grep "$1" | head -n 1 | grep "$1"` ||
+	fuzzy_match=`$LS_PATH $GVM_ROOT/gos | $SORT_PATH | $GREP_PATH "$1" | $HEAD_PATH -n 1 | $GREP_PATH "$1"` ||
 		display_error "Invalid version $1" || return 1
 
 	export PATH=$GVM_PATH_BACKUP
diff --git a/scripts/function/errors b/scripts/function/errors
deleted file mode 100644
index 6c19163..0000000
--- a/scripts/function/errors
+++ /dev/null
@@ -1 +0,0 @@
-LS_ERROR="Couldn't find ls"
diff --git a/scripts/function/tools b/scripts/function/tools
new file mode 100644
index 0000000..e5f5d59
--- /dev/null
+++ b/scripts/function/tools
@@ -0,0 +1,11 @@
+#!/bin/bash
+LS_ERROR="Couldn't find ls"
+GREP_ERROR="Couldn't find grep"
+SORT_ERROR="Couldn't find sort"
+HEAD_ERROR="Couldn't find head"
+
+LS_PATH=`unalias ls &> /dev/null; which ls` || display_error "$LS_ERROR" || return 1
+GREP_PATH=`unalias grep &> /dev/null; which grep` || display_error "$GREP_ERROR" || return 1
+SORT_PATH=`unalias sort &> /dev/null; which sort` || display_error "$SORT_ERROR" || return 1
+HEAD_PATH=`unalias head &> /dev/null; which head` || display_error "$HEAD_ERROR" || return 1
+
diff --git a/scripts/install b/scripts/install
index 4d56ba5..d20e2f3 100755
--- a/scripts/install
+++ b/scripts/install
@@ -48,7 +48,7 @@ download_source() {
 }
 
 check_tag() {
-	version=`hg tags -R $GO_CACHE_PATH | awk '{print $1}' | sort | grep "$VERSION" | head -n 1 | grep "$VERSION"`
+	version=`hg tags -R $GO_CACHE_PATH | awk '{print $1}' | $SORT_PATH | $GREP_PATH "$VERSION" | $HEAD_PATH -n 1 | $GREP_PATH "$VERSION"`
 }
 
 update_source() {
@@ -150,7 +150,7 @@ main() {
 	GVM_GOINSTALL="goinstall"
 	which goinstall &> /dev/null ||
 		GVM_GOINSTALL="go get"
-	x="`hg tags -R ~/.gvm/archive/go`"; echo ${x#*b0819469a6df} | grep "$version " &> /dev/null
+	x="`hg tags -R ~/.gvm/archive/go`"; echo ${x#*b0819469a6df} | $GREP_PATH "$version " &> /dev/null
 	if [[ "$?" == "1" ]]; then
 		install_gb || display_warning "Failed to install gb"
 		install_gpkg || display_warning "Failed to install gpkg"
diff --git a/scripts/list b/scripts/list
index c3312f1..9569dcd 100755
--- a/scripts/list
+++ b/scripts/list
@@ -1,6 +1,5 @@
 #!/bin/bash
 . $GVM_ROOT/scripts/functions
-LS_PATH=`which ls` || display_error "$LS_ERROR" || return 1
 
 echo
 display_message "gvm gos (installed)"
diff --git a/scripts/listall b/scripts/listall
index 902b955..69776f9 100755
--- a/scripts/listall
+++ b/scripts/listall
@@ -32,7 +32,7 @@ read_command_line $@
 echo
 display_message "gvm gos (available)"
 echo
-versions=`curl -s https://go.googlecode.com/hg/.hgtags | awk '{ print $2 }' | grep "$tag_filter" | sort`
+versions=`curl -s https://go.googlecode.com/hg/.hgtags | awk '{ print $2 }' | $GREP_PATH "$tag_filter" | $SORT_PATH`
 if [[ $? -ne 0 ]]; then
 	display_error "Failed to get version list from Google"
 fi
diff --git a/scripts/templates/binary b/scripts/templates/binary
index d037f5e..35cfa1e 100644
--- a/scripts/templates/binary
+++ b/scripts/templates/binary
@@ -1,5 +1,6 @@
 #!/bin/bash
-echo $1 | sed -n -e '/_.*_/ p' | grep "_" &> /dev/null
+. $GVM_ROOT/scripts/functions/tools
+echo $1 | sed -n -e '/_.*_/ p' | $GREP_PATH "_" &> /dev/null
 if [ "$?" == "0" ]; then
 	version=`echo $1 | sed 's/_\(.*\)_/\1/'`
 	if [ ! -f $GVM_ROOT/pkgsets/$gvm_go_name/$gvm_pkgset_name/pkg.gvm/{{package_name}}/$version/bin/{{binary_name}} ]; then
diff --git a/scripts/uninstall b/scripts/uninstall
index 2dced12..1facb66 100755
--- a/scripts/uninstall
+++ b/scripts/uninstall
@@ -1,11 +1,10 @@
 #!/bin/bash
 . $GVM_ROOT/scripts/functions
-LS_PATH=`which ls` || display_error "$LS_ERROR" || return 1
 
 [[ "$1" == "" ]] && 
 	display_error "Please specifiy the version"
 
-fuzzy_match=`$LS_PATH $GVM_ROOT/gos | sort | grep "$1" | head -n 1 | grep "$1"` ||
+fuzzy_match=`$LS_PATH $GVM_ROOT/gos | $SORT_PATH | $GREP_PATH "$1" | $HEAD_PATH -n 1 | $GREP_PATH "$1"` ||
 	display_error "Invalid version $1"
 
 if [ -d $GVM_ROOT/gos/$fuzzy_match ]; then