wrongly mounted s4 i9506 = now bricked?

I just rooted my SG S4 Android 5.0.1 with auto-root. Everything worked fine (root complete and SU installed) till I think I gave a bad mount command in the root directory on the phone in terminal (i guess here it went wrong, not sure. Or perhaps during installation of bash or nano) when I was installing bash and nano. Since it rebooted, I **lost the wifi and cannot adb shell into my phone** anymore from mac.

Afterwards, I managed to flash clockwork mod recovery v6.0.4.6. and was able to mount /system, which enabled the ./adb shell again. However i can now only pwd and cd, everything else gets this error: /sbin/sh: ls: Permission denied

I think my phone is still recoverable, however I don't know what to do and don't want to risk making things worse. Which andoird wizard can help me please?

**Below here were my bash nano install commands:**

./adb shell
su
mount -o remount,rw /system
cp -r /storage/extSdCard/bashnano/terminfo /system/etc
cp /storage/extSdCard/bashnano/profile /etc
cp /storage/extSdCard/bashnano/bash /data
cp /storage/extSdCard/bashnano/nano /data
chmod 755 /data/bash
chmod 755 /data/nano
cd /system/bin/
mv sh sh.old
ln -s /data/bash sh
ln -s /data/bash bash
ln -s /data/nano nano

export TERMINFO=/etc/terminfo
export TERM=linux

mount -o remount,ro /system

**P.S. So I also performed a regular mount in root, which i think is what made things bad, but not totally sure!**