How to remove ^[, and all of the escape sequences in a file using linux shell scripting
We want to remove  ^[, and all of the escape sequences. 

Are you looking for ansifilter? 

Two things you can do: enter the literal escape (in bash:)
Using keyboard entry:
sed 's/Ctrl-vEsc//g'
alternatively
sed 's/Ctrl-vCtrl-[//g'
Or you can use character escapes:
sed 's/\x1b//g'

or for all control characters:
sed 's/[\x01-\x1F\x7F]//g' # NOTE: zaps TAB character too!

