linux watch命令

watch可以帮你监测一个命令的运行结果，来监测你想要的一切命令的结果变化

watch -n 1 -d "命令" 每隔一秒高亮显示后面命令的变化

watch -d 'ls -l'
# 每隔一秒高亮显示当前目录变化

Usage:
 watch [options] command

Options:
  -b, --beep             beep if command has a non-zero exit
  -c, --color            interpret ANSI color and style sequences
  -d, --differences[=<permanent>]
                         highlight changes between updates
  -e, --errexit          exit if command has a non-zero exit
  -g, --chgexit          exit when output from command changes
  -n, --interval <secs>  seconds to wait between updates
  -p, --precise          attempt run command in precise intervals
  -t, --no-title         turn off header
  -x, --exec             pass command to exec instead of "sh -c"

 -h, --help     display this help and exit
 -v, --version  output version information and exit

https://www.cnblogs.com/ftl1012/p/watch.html