diff --git a/README.org b/README.org
index b99dba1..127df5a 100644
--- a/README.org
+++ b/README.org
@@ -19,7 +19,7 @@
 
   #+begin_src sh
     # sf -- script framework (https://github.com/Deleh/sf)
-    sftrst=`echo -e "\e[0m"`;sftbf=`echo -e "\e[1m"`;sftdim=`echo -e "\e[2m"`;sftul=`echo -e "\e[4m"`;sftblink=`echo -e "\e[5m"`;sftinv=`echo -e "\e[7m"`;sfthide=`echo -e "\e[8m"`;sftk=`echo -e "\e[30m"`;sftr=`echo -e "\e[31m"`;sftg=`echo -e "\e[32m"`;sfty=`echo -e "\e[33m"`;sftb=`echo -e "\e[34m"`;sftm=`echo -e "\e[35m"`;sftc=`echo -e "\e[36m"`;sftw=`echo -e "\e[97m"`;function _sferr { echo -e "${sftbf}${sftr}SF PARSE ERROR${sftrst} $1";exit 1;};function sferr { echo -e "${sftbf}${sftr}ERROR${sftrst} $1";if [ -z "$2" ];then exit 1;fi;};function sfwarn { echo -e "${sftbf}${sfty}WARNING${sftrst} $1";};OLDIFS=$IFS;IFS=";";_sfphead="";_sfpdesc="";_sfodesc="";_sfexamples="";_sfpargs=();declare -A _sfflags;declare -A _sfargs;for a in "${sfargs[@]}";do _sfsubst=${a//";"};_sfcount="$(((${#a} - ${#_sfsubst})))";if [ $_sfcount -eq 1 ];then read -r -a _sfparsearr<<<"${a}";_sfpargs+=("${_sfparsearr[0]}");_sfphead="$_sfphead ${_sfparsearr[0]}";_sfpdesc="$_sfpdesc  ${_sfparsearr[0]};${_sfparsearr[1]}\n";elif [ $_sfcount -eq 2 ];then read -r -a _sfparsearr<<<"${a}";_sfflags["-${_sfparsearr[1]}"]="${_sfparsearr[0]}";_sfflags["--${_sfparsearr[0]}"]="${_sfparsearr[0]}";declare ${_sfparsearr[0]}=false;_sfodesc="$_sfodesc  -${_sfparsearr[1]}, --${_sfparsearr[0]};${_sfparsearr[2]}\n";elif [ $_sfcount -eq 4 ];then read -r -a _sfparsearr<<<"${a}";_sfargs["-${_sfparsearr[1]}"]="${_sfparsearr[0]}";_sfargs["--${_sfparsearr[0]}"]="${_sfparsearr[0]}";declare ${_sfparsearr[0]}="${_sfparsearr[3]}";_sfodesc="$_sfodesc  -${_sfparsearr[1]}, --${_sfparsearr[0]} ${_sfparsearr[2]};${_sfparsearr[4]} (default: ${_sfparsearr[3]})\n";else _sferr "Wrong argument declaration: $a";fi;done;for e in "${sfexamples[@]}";do _sfsubst=${e//";"};_sfcount="$(((${#e} - ${#_sfsubst})))";if [ $_sfcount -eq 1 ];then read -r -a _sfparsearr<<<"${e}";_sfexamples="$_sfexamples  ${_sfparsearr[0]};${_sfparsearr[1]}\n";else _sferr "Wrong example declaration: $e";fi;done;IFS=$OLDIFS;function sfusage { if [ -z ${sfname+x} ];then sfname=$(basename "$0");else echo -n "Usage: $sfname";fi;if [ "$_sfodesc" != "" ];then echo -n " OPTIONS";fi;echo -e "$_sfphead";if [ ! -z ${sfdesc+x} ];then echo -e "\n$sfdesc";fi;if [ "$_sfpdesc" != "" ];then echo -e "\nPOSITIONAL ARGUMENTS";echo -e "$_sfpdesc"|column -c 80 -s ";" -t -W 2;fi;if [ "$_sfodesc" != "" ];then echo -e "\nOPTIONS";echo -e "$_sfodesc"|column -c 80 -s ";" -t -W 2;fi;if [ "$_sfexamples" != "" ];then echo -e "\nEXAMPLES";echo -e "$_sfexamples"|column -c 80 -s ";" -t -W 2;fi;if [ ! -z ${sfextra+x} ];then echo -e "\n$sfextra";fi;exit 0;};for a in "$@";do if [ "$a" == "-h" ]||[ "$a" == "--help" ];then sfusage;fi;done;while(("$#"));do if [ ! -z ${_sfflags["$1"]} ];then declare ${_sfflags["$1"]}=true;elif [ ! -z ${_sfargs["$1"]} ];then if [ -n "$2" ]&&[ "${2:0:1}" != "-" ];then declare ${_sfargs["$1"]}="$2";shift;else sferr "Argument for '$1' missing";fi;else if [ "${1:0:1}" == "-" ];then sferr "Unsupported argument: $1";else if [ "${#_sfpargs[@]}" != 0 ];then declare ${_sfpargs[0]}="$1";_sfpargs=("${_sfpargs[@]:1}");else sferr "Too many positional arguments";fi;fi;fi;shift;done;if [ ${#_sfpargs[@]} != 0 ];then for p in "${_sfpargs[@]}";do sferr "Positional argument '$p' missing" 0;done;exit 1;fi
+    sftrst=$'\e[0m';sftbf=$'\e[1m';sftdim=$'\e[2m';sftul=$'\e[4m';sftblink=$'\e[5m';sftinv=$'\e[7m';sfthide=$'\e[8m';sftk=$'\e[30m';sftr=$'\e[31m';sftg=$'\e[32m';sfty=$'\e[33m';sftb=$'\e[34m';sftm=$'\e[35m';sftc=$'\e[36m';sftw=$'\e[97m';function _sferr { echo -e "${sftbf}${sftr}SF PARSE ERROR${sftrst} $1";exit 1;};function sferr { echo -e "${sftbf}${sftr}ERROR${sftrst} $1";if [ -z "$2" ];then exit 1;fi;};function sfwarn { echo -e "${sftbf}${sfty}WARNING${sftrst} $1";};OLDIFS=$IFS;IFS=";";_sfphead="";_sfpdesc="";_sfodesc="";_sfexamples="";_sfpargs=();declare -A _sfflags;declare -A _sfargs;for a in "${sfargs[@]}";do _sfsubst=${a//";"};_sfcount="$(((${#a} - ${#_sfsubst})))";if [ $_sfcount -eq 1 ];then read -r -a _sfparsearr<<<"${a}";_sfpargs+=("${_sfparsearr[0]}");_sfphead="$_sfphead ${_sfparsearr[0]}";_sfpdesc="$_sfpdesc  ${_sfparsearr[0]};${_sfparsearr[1]}\n";elif [ $_sfcount -eq 2 ];then read -r -a _sfparsearr<<<"${a}";_sfflags["-${_sfparsearr[1]}"]="${_sfparsearr[0]}";_sfflags["--${_sfparsearr[0]}"]="${_sfparsearr[0]}";declare ${_sfparsearr[0]}=false;_sfodesc="$_sfodesc  -${_sfparsearr[1]}, --${_sfparsearr[0]};${_sfparsearr[2]}\n";elif [ $_sfcount -eq 4 ];then read -r -a _sfparsearr<<<"${a}";_sfargs["-${_sfparsearr[1]}"]="${_sfparsearr[0]}";_sfargs["--${_sfparsearr[0]}"]="${_sfparsearr[0]}";declare ${_sfparsearr[0]}="${_sfparsearr[3]}";_sfodesc="$_sfodesc  -${_sfparsearr[1]}, --${_sfparsearr[0]} ${_sfparsearr[2]};${_sfparsearr[4]} (default: ${_sfparsearr[3]})\n";else _sferr "Wrong argument declaration: $a";fi;done;for e in "${sfexamples[@]}";do _sfsubst=${e//";"};_sfcount="$(((${#e} - ${#_sfsubst})))";if [ $_sfcount -eq 1 ];then read -r -a _sfparsearr<<<"${e}";_sfexamples="$_sfexamples  ${_sfparsearr[0]};${_sfparsearr[1]}\n";else _sferr "Wrong example declaration: $e";fi;done;IFS=$OLDIFS;function sfusage { if [ -z ${sfname+x} ];then sfname=$(basename "$0");else echo -n "Usage: $sfname";fi;if [ "$_sfodesc" != "" ];then echo -n " OPTIONS";fi;echo -e "$_sfphead";if [ ! -z ${sfdesc+x} ];then echo -e "\n$sfdesc";fi;if [ "$_sfpdesc" != "" ];then echo -e "\nPOSITIONAL ARGUMENTS";echo -e "$_sfpdesc"|column -c 80 -s ";" -t -W 2;fi;if [ "$_sfodesc" != "" ];then echo -e "\nOPTIONS";echo -e "$_sfodesc"|column -c 80 -s ";" -t -W 2;fi;if [ "$_sfexamples" != "" ];then echo -e "\nEXAMPLES";echo -e "$_sfexamples"|column -c 80 -s ";" -t -W 2;fi;if [ ! -z ${sfextra+x} ];then echo -e "\n$sfextra";fi;exit 0;};for a in "$@";do if [ "$a" == "-h" ]||[ "$a" == "--help" ];then sfusage;fi;done;while(("$#"));do if [ ! -z ${_sfflags["$1"]} ];then declare ${_sfflags["$1"]}=true;elif [ ! -z ${_sfargs["$1"]} ];then if [ -n "$2" ]&&[ "${2:0:1}" != "-" ];then declare ${_sfargs["$1"]}="$2";shift;else sferr "Argument for '$1' missing";fi;else if [ "${1:0:1}" == "-" ];then sferr "Unsupported argument: $1";else if [ "${#_sfpargs[@]}" != 0 ];then declare ${_sfpargs[0]}="$1";_sfpargs=("${_sfpargs[@]:1}");else sferr "Too many positional arguments";fi;fi;fi;shift;done;if [ ${#_sfpargs[@]} != 0 ];then for p in "${_sfpargs[@]}";do sferr "Positional argument '$p' missing" 0;done;exit 1;fi
   #+end_src
 
 * Usage
diff --git a/sf b/sf
index c562c7a..83fa1a1 100644
--- a/sf
+++ b/sf
@@ -3,22 +3,22 @@
 # sf -- script framework (https://github.com/Deleh/sf)
 
 # Text formatting variables
-sftrst=`echo -e "\e[0m"`
-sftbf=`echo -e "\e[1m"`
-sftdim=`echo -e "\e[2m"`
-sftul=`echo -e "\e[4m"`
-sftblink=`echo -e "\e[5m"`
-sftinv=`echo -e "\e[7m"`
-sfthide=`echo -e "\e[8m"`
+sftrst=$'\e[0m'
+sftbf=$'\e[1m'
+sftdim=$'\e[2m'
+sftul=$'\e[4m'
+sftblink=$'\e[5m'
+sftinv=$'\e[7m'
+sfthide=$'\e[8m'
 
-sftk=`echo -e "\e[30m"`
-sftr=`echo -e "\e[31m"`
-sftg=`echo -e "\e[32m"`
-sfty=`echo -e "\e[33m"`
-sftb=`echo -e "\e[34m"`
-sftm=`echo -e "\e[35m"`
-sftc=`echo -e "\e[36m"`
-sftw=`echo -e "\e[97m"`
+sftk=$'\e[30m'
+sftr=$'\e[31m'
+sftg=$'\e[32m'
+sfty=$'\e[33m'
+sftb=$'\e[34m'
+sftm=$'\e[35m'
+sftc=$'\e[36m'
+sftw=$'\e[97m'
 
 # Internal error function
 function _sferr {