让回声＆QUOT;自动填充＆QUOT;一定宽度的线 [英] Make echo "autofill" a line of certain width

问题描述

我有一个相当大的bash脚本其内容在一些变量，然后相呼应它们。我没有办法事先知道这些变量的长度，我不希望他们缩短或以任何方式进行格式化 - 我只是希望他们在他们读相同的形式呼应

I have a rather large bash script which reads in a number of variables and then echoes them. I have no way to know beforehand the length of these variables and I do not want to shorten them or format them in any way - I just want them echoed in the same form they are read in.

要提高我的脚本的输出可读性我呼应了一些线来帮助眼睛，是这样的：

To improve readability of my script's output I am echoing some lines to help the eye, something like this:

echo "--------------------------------"
echo "Here come some variables       |"
echo "                               |"
echo "a = $a and b = $b"
echo "                               |"
echo "End of the script              |"
echo "--------------------------------"

这将输出：

--------------------------------
Here come some variables       |
                               |
a = 1.23e-19 and b = hello
                               |
End of the script              |
--------------------------------

我想实现的是对回声（或替代解决方案）来识别它需要多少空车位插入后的变量打印，因此它可以对齐垂直线 | 与他们的休息，所以这看起来就像这样：

What I want to achieve is for echo (or some alternative solution) to recognize how many empty spaces it needs to insert after the variables are printed so it can align a vertical line | with the rest of them, so that this output looks like this:

--------------------------------
Here come some variables       |
                               |
a = 1.23e-19 and b = hello     |
                               |
End of the script              |
--------------------------------

它并不需要是一个回声唯一的解决办法，但我会AP preciate简单。任何想法？

It does not need to be an echo only solution, but I would appreciate simplicity. Any ideas?

推荐答案

因此​​，使用详细阐述阿克塞尔的回答有点的printf 可以做到这一点。如果线宽然后线宽：

So elaborating a bit on Axel's answer using printfcan do this. If the line width is linewidth then:

a="1.23e-19" 
b="hello"
linewidth=30
echo "--------------------------------"
echo "Here come some variables       |"
echo "                               |"
printf "%-${linewidth}s |\n" "a = $a and b = $b"
echo "                               |"
echo "End of the script              |"
echo "--------------------------------"

不正是我想要的。输出：

does exactly what I want. Output:

--------------------------------
Here come some variables       |
                               |
a = 1.23e-19 and b = hello     |
                               |
End of the script              |
--------------------------------

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