man scale

NAME

scale - spawn a scale to control a variable

SYNOPSIS

scale VAR [MIN] [MAX]

DESCRIPTION

Spawn a scale the user can move to set a numeric value to a variable.
Runs in the background.

There is a limit for how many scales could be created (16 scales per terminal max, and 4 per variable name max).

OPTIONS

VAR : the controlled variable

MIN, MAX : scale boundaries (order does not matter)

EXIT STATUS

0 : if OK

1 : if invalid parameters

2 : if the scale cannot be spawned

3 : if a new scale cannot be created because there are already too many scales