That’s a much-better option — thanks! I’ve added a note at the top of the post.

For ESC, try CTRL-[ (the old-school escape sequence).

Now that devices are shipping with a lot more storage, I think the move is towards using something like GnuRoot, where you can install an entire Debian distro (including Emacs, if you want) on a chroot mount.

https://play.google.com/store/apps/details?id=champion.gnuroot
https://play.google.com/store/apps/details?id=com.gnuroot.debian

Some more specific informative notes regarding my specific positive feedback:
My setup:
– Nexus 6 with Android 5.1.1, none rooted
– My host PC running Win7
I followed the instructions depicted above with the following notes:
Step 1: Installed “Terminal Emulator” (none rooted)

Step 3: The home directory of the “Terminal Emulator” is /data/data/jackpal.androidterm/app_HOME.
Using the file explorer on my Win7 host, I copied the emacs.bin file mentioned in this step to a directory I created on Nexis 6 under “Internal Storage” directory as it is seen automatically by the Win7 regular file explorer.
The same “Internal Storage” directory is detected as “/sdcard/” from the terminal emulator, so I could copy the emacs.bin to the terminal emulator home directory.
For example if the emacs.bin was copied to the directory “kkk” then from the terminal I would do:
cd /data/data/jackpal.androidterm/app_HOME (or simply “cd ~”)
cp /sdcard/kkk/emacs.bin .

Step 4: Since I did not have busy box installed on my Nexus 6 (for some reason the installation failed), I extracted the
mentioned files with “7-Zip” (free insallation for Win7, the x64 version, http://www.7-zip.org/download.html) on my host machine, and
then moved the extracted directories (etc,terminfo and lisp) to a “emacs” directory created on Nexus 6 under Nexus 6 “Internal Storage” directory as it is seen automatically by the Win7 regular file explorer. The same “Internal Storage” directory is detected as “/sdcard/” from the terminal emulator

Step 5: I created the script on my Win7 host and then moved it to the Terminal APP home directory as described in my comment above for step 4.

Step 6: What worked for me after “chmod”ing the script as described in this step, was the command line:
$ source emacs
I failed to run it as is (that is, running the command line “./emacs” from the terminal home directory). When running “./emacs” I get the following error prompt:
/system/bin/sh: ./emacs: No such file or directory

Thanks a lot.

This is after not setting TERMINFO since there is a terminfo/ for Termux. Also tried to copy-paste files from terminfo folders to the one in /sdcard/emacs directory and then set the variable. Doesn’t work. Thanks. 🙂

emacs: Terminal type xterm-256color is not defined. If that is not the actual type of terminal you have,
use the Bourne shell command `TERM=… export TERM’ (C-shell:
`setenv TERM …’) to specify the correct type. It may be necessary
to do `unset TERMINFO’ (C-shell: `unsetenv TERMINFO’) as well.