bash 在bash中从占据终端全宽的破折号字符绘制一条水平线
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原文地址: http://stackoverflow.com/questions/42762643/
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Draw a horizontal line from dash character occupying the full width of a terminal in bash
提问by exebook
I need a command that will draw a horizontal "line" in the terminal. The line must be exactly the width of the terminal long (regardless of a current terminal width) and consist of a dash character (although a unicode symbol for a horizontal line can be also used).
我需要一个命令来在终端中绘制一条水平“线”。该线必须与终端的宽度完全相同（无论当前终端宽度如何）并且由一个破折号组成（尽管也可以使用水平线的 unicode 符号）。
It is better if it can be colored.
如果能上色就更好了。
I need to use it like this:
我需要像这样使用它：
echo some text
drawline
echo more text
And the output would look something like this:
输出看起来像这样：
echo some text
---------------------------------------------------------------------------------
echo more text
回答by Zumo de Vidrio
Try with:
尝试：
echo some text
printf '%*s\n' "${COLUMNS:-$(tput cols)}" '' | tr ' ' -
echo some text
回答by cb0
In bash and zsh there is the $COLUMNSvariable which you can use.
在 bash 和 zsh 中有$COLUMNS您可以使用的变量。
I use this line for that purpose:
我为此目的使用这一行：
printf %"$COLUMNS"s |tr " " "-"
You can also use seq, but this is not as intuitive as the other solution:
您也可以使用seq，但这不如其他解决方案直观：
seq -s- $COLUMNS|tr -d '[:digit:]'
Edit:
编辑：
It seems that $COLUMNSis a local bash variable and you will need to export it. So now there are (at least) 2 options.
这似乎$COLUMNS是一个本地 bash 变量，您需要将其导出。所以现在有（至少）2 个选项。
Export the variable before you call the script:
export COLUMNS; ./your_script.shUse
tputas Zumo de Vidrio suggests.printf %"$(tput cols)"s |tr " " "-"
在调用脚本之前导出变量：
export COLUMNS; ./your_script.sh使用
tput如谟德Vidrio建议。printf %"$(tput cols)"s |tr " " "-"
回答by Shakiba Moshiri
A simple Perl one-linerstty size | perl -ale 'print "-"x$F[1]'
一个简单的 Perl 单行stty size | perl -ale 'print "-"x$F[1]'
NOTE
you can see the heightand widthof your terminal with stty size
注意
你可以看到终端的高度和宽度stty size
回答by Inoperable
Super simple horizontal ruler:
超级简单的水平尺：
repeat $(tput cols) echo -ne "-";
repeat $(tput cols) echo -ne "-";
