如果您不介意Perl一行代码:

$ perl -CS -E 'say "\x{2620}"'
☠

-CS支持输入UTF-8解码和输出UTF-8编码。-E将下一个参数计算为Perl，启用了say等现代特性。如果你不想在结尾使用换行符，使用print而不是say。

只要您的文本编辑器能够处理Unicode(假定以UTF-8编码)，您就可以直接输入Unicode代码点。

例如，在Vim文本编辑器中，您可以进入插入模式并按Ctrl + V + U，然后按4位十六进制数(必要时可以用零填充)。输入Ctrl + V + U 2 6 20。参见:在文档中插入Unicode字符的最简单方法是什么?

在运行Bash的终端上，您可以键入CTRL+SHIFT+U，并键入所需字符的十六进制码位。在输入过程中，你的光标应该显示一个带下划线的u。你输入的第一个非数字结束输入，并呈现字符。所以你可以在Bash中使用以下方法打印U+2620:

echo CTRL + SHIFT + U2620ENTERENTER

(第一个输入结束Unicode输入，第二个执行echo命令。)

来源:Ubuntu SE

对不起，我又提了这个老问题。但是在使用bash时，有一种非常简单的方法可以从纯ASCII输入创建Unicode码点，甚至根本没有分叉:

unicode() { local -n a="$1"; local c; printf -vc '\\U%08x' "$2"; printf -va "$c"; }
unicodes() { local a c; for a; do printf -vc '\\U%08x' "$a"; printf "$c"; done; };

如下所示使用它来定义某些代码点

unicode crossbones 0x2620
echo "$crossbones"

或者将前65536个unicode码点转储到stdout(在我的机器上耗时不到2秒。额外的空格是为了防止某些字符由于shell的monospace字体而相互流入):

for a in {0..65535}; do unicodes "$a"; printf ' '; done

或者讲一个非常典型的父母的故事(这需要Unicode 2010):

unicodes 0x1F6BC 32 43 32 0x1F62D 32 32 43 32 0x1F37C 32 61 32 0x263A 32 32 43 32 0x1F4A9 10

解释:

printf '\UXXXXXXXX' prints out any Unicode character printf '\\U%08x' number prints \UXXXXXXXX with the number converted to Hex, this then is fed to another printf to actually print out the Unicode character printf recognizes octal (0oct), hex (0xHEX) and decimal (0 or numbers starting with 1 to 9) as numbers, so you can choose whichever representation fits best printf -v var .. gathers the output of printf into a variable, without fork (which tremendously speeds up things) local variable is there to not pollute the global namespace local -n var=other aliases var to other, such that assignment to var alters other. One interesting part here is, that var is part of the local namespace, while other is part of the global namespace. Please note that there is no such thing as local or global namespace in bash. Variables are kept in the environment, and such are always global. Local just puts away the current value and restores it when the function is left again. Other functions called from within the function with local will still see the "local" value. This is a fundamentally different concept than all the normal scoping rules found in other languages (and what bash does is very powerful but can lead to errors if you are a programmer who is not aware of that).

快速一行代码将UTF-8字符转换为3字节格式:

var="$(echo -n '☠' | od -An -tx1)"; printf '\\x%s' ${var^^}; echo

or

echo -n '☠' | od -An -tx1 | sed 's/ /\\x/g'  

两者的输出都是\xE2\x98\xA0，所以你可以反过来写:

echo $'\xe2\x98\xa0'   # ☠

printf内置(就像coreutils的printf一样)知道接受4位Unicode字符的\u转义序列:

   \uHHHH Unicode (ISO/IEC 10646) character with hex value HHHH (4 digits)

使用Bash 4.2.37(1)测试:

$ printf '\u2620\n'
☠

我用这个:

$ echo -e '\u2620'
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这比搜索十六进制表示法要简单得多。我在我的shell脚本中使用它。这适用于侏儒术语和urxvt AFAIK。