watch 能间歇地执行程序,并将输出结果以全屏的方式显示,默认时2s执行一次;
watch -n 5 ping -c 1 www.baidu.com # 进行循环5秒钟,发送一次ping包;
使用范例:
To watch for mail, you might do
watch -n 60 from
To watch the contents of a directory change, you could use
watch -d ls -l
If you're only interested in files owned by user joe, you might use
watch -d 'ls -l | fgrep joe'
To see the effects of quoting, try these out
watch echo $$
watch echo '$$'
watch echo "'"'$$'"'"
更多文档,请直接查找man手册;非常好用的工具,我今天才知道。。
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