diff --git a/ok-show.py b/ok-show.py
index 12843bb..68b04a8 100755
--- a/ok-show.py
+++ b/ok-show.py
@@ -2,7 +2,7 @@
 # -*- coding: utf-8 -*-
 
 from __future__ import print_function
-import argparse, codecs, os, re, sys
+import argparse, codecs, os, re, shutil, sys
 
 def ansi_len(s):
     no_ansi_s = rx.ansi_len.sub('', s)
@@ -130,12 +130,12 @@ def print_line(l, clr, nr_positions_line_nr, format_line):
 def main():
     # customizations
     clr = ok_color()
-
+    terminal_size = shutil.get_terminal_size()
     # handle arguments
     parser = argparse.ArgumentParser(description='Show the ok-file colorized (or just one line).')
     parser.add_argument('--verbose',        '-v', metavar='V', type=int, default=1, help='0=quiet, 1=normal, 2=verbose. Defaults to 1. ')
     parser.add_argument('--comment_align',  '-c', metavar='CA', type=int, default=2, choices= [0,1,2,3], help='Level ($e) of comment alignment. 0=no alignment, 1=align consecutive lines (Default), 2=including whitespace, 3 align all.')
-    parser.add_argument('--terminal_width', '-t', metavar='TW', type=int, default=230, help='number of columns of the terminal (tput cols)')
+    parser.add_argument('--terminal_width', '-t', metavar='TW', type=int, default=terminal_size.columns, help='number of columns of the terminal (tput cols)')
     parser.add_argument('only_line_nr', metavar='N', type=int, nargs='?', help='the line number to show')
     args = parser.parse_args()
 
diff --git a/ok.sh b/ok.sh
index b5ec82d..06d8685 100755
--- a/ok.sh
+++ b/ok.sh
@@ -73,7 +73,7 @@ environment variables (for internal use):
         shift
         # get the line to be executed
         local line_text
-        line_text="$(cat "$ok_file" | "$_OK__PATH_TO_PYTHON" "${_OK__PATH_TO_ME}/ok-show.py" -v "$verbose" -c "$comment_align" -t "$(tput cols)" "$line_nr")"
+        line_text="$(cat "$ok_file" | "$_OK__PATH_TO_PYTHON" "${_OK__PATH_TO_ME}/ok-show.py" -v "$verbose" -c "$comment_align" "$line_nr")"
         local res=$?
         if [[ $res -ne 0 ]]; then
             #because stdout/stderr are swapped by ok-show.py in this case, handle this too
@@ -86,7 +86,7 @@ environment variables (for internal use):
     function _ok_cmd_list {
         unset -f _ok_cmd_list
 
-        cat "$ok_file" | "$_OK__PATH_TO_PYTHON" "${_OK__PATH_TO_ME}/ok-show.py" -v "$verbose" -c "$comment_align" -t "$(tput cols)" || return $?
+        cat "$ok_file" | "$_OK__PATH_TO_PYTHON" "${_OK__PATH_TO_ME}/ok-show.py" -v "$verbose" -c "$comment_align" || return $?
     }
 
     # export variables because python is a sub-process, and variables might have changed since initialization
@@ -97,8 +97,8 @@ environment variables (for internal use):
     local -r version="0.8.0"
     # used for colored output (see: https://stackoverflow.com/a/20983251/56)
     # notice: this is partly a duplication from code in ok-show.py
-    local -r c_nc=$(tput sgr0)
-    if [ -z ${_OK_C_NUMBER+x} ];  then local c_number=$(tput setaf 6);  else local c_number=$_OK_C_NUMBER;   fi #NUMBER defaults to CYAN
+    local -r c_nc='\[\e[0m\]'
+    if [ -z ${_OK_C_NUMBER+x} ];  then local c_number='\[\e[0;36m\]';   else local c_number=$_OK_C_NUMBER;   fi #NUMBER defaults to CYAN
     if [ -z ${_OK_C_PROMPT+x} ];  then local c_prompt=$c_number;        else local c_prompt=$_OK_C_PROMPT;   fi #PROMPT defaults to same color as NUMBER
     # other customizations (some environment variables can be overridden by arguments)
     if [ -z ${_OK_PROMPT+x} ];    then local prompt="$ ";               else local prompt=$_OK_PROMPT;       fi