capsesc.sh is a script that creates a tty keymap which switches the esc and caps_lock keys.
This is very useful since the average user has way more keypresses for esc as opposed to caps_lock, which is more easily reachable in a tipical keyboard layout.
For example, it is very useful for Vim users.
Switching the esc and caps_lock keys in the graphical interface is quite easy, for example in X you might just run setxkbdmap -option caps:swapescape.
In the tty this is not so easy, since you need to create a custom keymap.
The script aims to do so automatically, by creating a keymap either over the current one or over a specified one.
As in capsesc.sh --help:
capsesc.sh: create a tty keymap with the caps_lock and esc keys switched.
USAGE:
capsesc.sh [OPTIONS] [MAP_NAME]
If neither --load nor --install are specified, leaves the new keymap in the current directory.
OPTIONS:
-l, --load Load keymap after creating it (requires root privileges)
-i, --install NEW_NAME Install keymap in after creating it (requires root privileges)
(puts it in /usr/share/kbd/keymaps/custom)
-h, --help Show this help