Is there any easy way to modify files for this (the two asic-freq files and crontab) on all my miners simultaneously?
Simultaneously not, but there is faster way then edit everything again and again. You can copy files directly from one antminer to another. For example:
scp /etc/config/asic-freq-high 192.168.something.something:/etc/config
I imagine I would do this from the SSH (putty) instance on the machine that i have modified already? ie:
scp /etc/config/asic-freq-high 192.168.1.201:/etc/config
scp /etc/config/asic-freq-low 192.168.1.201:/etc/config
scp crontab 192.168.1.201:/
I imagine that it the crontab copy method will not work like this though?
is it possible to do something like this to have it operate to all IP addresses with antminer units (and is a user/pass not needed for each?)?:
scp /etc/config/asic-freq-high 192.168.1.201-192.168.1.220:/etc/config
scp /etc/config/asic-freq-low 192.168.1.201-192.168.1.220:/etc/config
scp crontab 192.168.1.201-192.168.1.220:/