下面是我如何在bash中执行多行注释。

我很欣赏这种机制的两个优点。一是注释可以嵌套。另一种是可以通过简单地注释掉初始行来启用块。

#!/bin/bash
# : <<'####.block.A'
echo "foo {" 1>&2
fn data1
echo "foo }" 1>&2
: <<'####.block.B'
fn data2 || exit
exit 1
####.block.B
echo "can't happen" 1>&2
####.block.A

在上面的例子中，“B”块被注释掉了，但是“A”块中不是“B”块的部分没有被注释掉。

运行该示例将产生以下输出:

foo {
./example: line 5: fn: command not found
foo }
can't happen

使用:'打开'和'关闭。

例如:

: '
This is a
very neat comment
in bash
'

在阅读了其他答案后，我想出了以下答案，恕我直言，这是一个评论。特别适合脚本内使用信息:

<< ////

Usage:
This script launches a spaceship to the moon. It's doing so by 
leveraging the power of the Fifth Element, AKA Leeloo.
Will only work if you're Bruce Willis or a relative of Milla Jovovich.

////

作为一名程序员，斜杠的序列会立即在我的大脑中注册为注释(尽管斜杠通常用于行注释)。

当然，“////”只是一个字符串;前缀和后缀中的斜杠个数必须相等。

简单的解决方案，不太聪明:

暂时阻塞脚本的一部分:

if false; then
    while you respect syntax a bit, please
    do write here (almost) whatever you want.
    but when you are
    done # write
fi

稍微复杂一点的版本:

time_of_debug=false # Let's set this variable at the beginning of a script

if $time_of_debug; then # in a middle of the script  
    echo I keep this code aside until there is the time of debug!
fi

你对此有什么看法?

function giveitauniquename()
{
  so this is a comment
  echo "there's no need to further escape apostrophes/etc if you are commenting your code this way"
  the drawback is it will be stored in memory as a function as long as your script runs unless you explicitly unset it
  only valid-ish bash allowed inside for instance these would not work without the "pound" signs:
  1, for #((
  2, this #wouldn't work either
  function giveitadifferentuniquename()
  {
    echo nestable
  }
}

下面是我如何在bash中执行多行注释。

我很欣赏这种机制的两个优点。一是注释可以嵌套。另一种是可以通过简单地注释掉初始行来启用块。

#!/bin/bash
# : <<'####.block.A'
echo "foo {" 1>&2
fn data1
echo "foo }" 1>&2
: <<'####.block.B'
fn data2 || exit
exit 1
####.block.B
echo "can't happen" 1>&2
####.block.A

在上面的例子中，“B”块被注释掉了，但是“A”块中不是“B”块的部分没有被注释掉。

运行该示例将产生以下输出:

foo {
./example: line 5: fn: command not found
foo }
can't happen