run termux programs as root..

termux-su.sh

#!/data/data/com.termux/files/usr/bin/sh

# sudo for Termux

# For security reasons some environent variables are reset by su
# So need to set LD_LIBRARY_PATH again

# root's HOME is set to termux's home/.suroot. You can add bashrc there
ROOT_HOME=$HOME/.suroot

case "$1" in
    '-')  
	# check if user has set shell
	if test -x "$HOME/.termux/shell" ; then
	    ROOT_SHELL=$HOME/.termux/shell
	    # has installed bash?
	elif test -x "$PREFIX/bin/bash" ; then
	    ROOT_SHELL="$PREFIX/bin/bash"
	    # no..fallback to default ash.
	else
	    ROOT_SHELL="$PREFIX/bin/ash"
	fi
	exec su -c  "LD_LIBRARY_PATH=/data/data/com.termux/files/usr/lib HOME=$ROOT_HOME $ROOT_SHELL"
	;;
    ''|'-h'|'--help')
	echo 'Sets up environment to allow termux programs to run with root access. Not the sudo as found in other *nixes'
	echo 'Usage: sudo [-|cmd args]'
	echo '- : Try to start a shell of termux as root shell. su by default runs /system/bin/sh.'
	echo 'cmd : Run termux program with args as root.'
	;;
    *)
	exec su -c  "LD_LIBRARY_PATH=/data/data/com.termux/files/usr/lib HOME=$ROOT_HOME ${@}";
	;;
esac

how to run this script

Me too

DEPRECATED: Use https://github.com/cswl/tsu instead.