如何打印出相同的路线,覆盖previous行? [英] How to print out to the same line, overriding previous line?
问题描述
有时我看到在终端打印结果到标准输出,但在同一行的一些命令。例如wget的打印箭头象下面几行:
Sometimes I see some commands in the terminal that print results to stdout but in the same line. For example wget prints an arrow like below lines:
0[=> ]100%
0[ => ]100%
0[ => ]100%
0[ => ]100%
0[ =>]100%
但它打印出来的同一行,所以它看起来像箭头移动。我如何使用bash或sh实现我的计划是一回事吗?我是否需要另外其他工具?
but it is printed out to the same line so it looks like the arrow is moving. How can I achieve the same thing in my programs using bash or sh? Do I need another other tools?
更新:
我知道我提到的wget,附带在默认情况下在Linux中,基于GNU Unix系统......有没有过在BSD系统工作的一般方法? (如OSX) - >确定,如果我使用bash,而不是SH然后它的工作原理:)
I know I mentioned wget, which comes by default in linux, GNU based unices ... Is there a general approach that works on BSDs too? (like OSX) -> OK, If I use bash instead of sh then it works :)
推荐答案
使用特殊字符 \\ r
。它返回到行开头而不进入下一个。
Use the special character \r
. It returns to the beginning of the line without going to the next one.
for i in {1..10} ; do
echo -n '['
for ((j=0; j<i; j++)) ; do echo -n ' '; done
echo -n '=>'
for ((j=i; j<10; j++)) ; do echo -n ' '; done
echo -n "] $i"0% $'\r'
sleep 1
done
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