How can I add a new line to a large file every n characters in terminal (one liner sed)?

How can I add a new line to a large file every n characters in terminal (one liner sed)?

bash shell text sed replace

shell

Open file created by R in an external program

r shell logging

shell

Single column data to multiple columns

linux bash shell sed awk

shell

Is awk a programming language or just a tool? [closed]

shell awk

shell

Can I store file contents to a variable in a shell script?

shell solaris sh

shell

How do you run multiple ruby files in conjunction in a shell script?

ruby shell

shell

how can I use linux command sed to process Little-endian UTF-16 file

shell utf-16 endianness

shell

Extracting only my function names from ELF binary

c linux shell awk readelf

shell

files with same name in different folders

linux bash file shell scripting

shell

Extract Maximum and minimum value using awk

shell unix awk

shell