Repeat command automaticaly
# Usage: watch [-dhntv] [--differences[=cumulative]] [--help] [--interval=<n>] [--no-title] [--version] <command>
# -d, --differences[=cumulative] highlight changes between updates
# (cumulative means highlighting is cumulative)
# -h, --help print a summary of the options
# -n, --interval=<seconds> seconds to wait between updates
# -v, --version print the version number
# -t, --no-title turns off showing the header
#
#
# example:
watch -n 1 -d <comando>