带有管道和标准输入的 Bash 子字符串
我的目标是将命令的输出减少到任意数量的字符（让我们使用 6）。我希望能够将此命令附加到管道的末尾，因此它应该能够仅使用标准输入。
echo "1234567890" | your command here
# desired output: 123456
我检查了 awk，我还注意到 bash 有一个 substr 命令，但是我提出的两个解决方案似乎都比它们需要的要长，我可以不要动摇我错过了一些更容易的东西的感觉。
我将发布我找到的两个解决方案作为答案，我欢迎任何批评以及新的解决方案！
已找到解决方案，感谢所有回答的人！
jcollado 和 Mithrandir 之间的关系很接近 - 我将来可能最终会使用两者。 Mithrandir 的答案是一个实际的子字符串，并且更容易查看结果，但 jcollado 的答案让我可以将其通过管道传输到剪贴板，而不会妨碍 EOL 字符。
My goal is to cut the output of a command down to an arbitrary number of characters (let's use 6). I would like to be able to append this command to the end of a pipeline, so it should be able to just use stdin.
echo "1234567890" | your command here
# desired output: 123456
I checked out awk, and I also noticed bash has a substr command, but both of the solutions I've come up with seem longer than they need to be and I can't shake the feeling I'm missing something easier.
I'll post the two solutions I've found as answers, I welcome any critique as well as new solutions!
Solution found, thank you to all who answered!
It was close between jcollado and Mithrandir - I will probably end up using both in the future. Mithrandir's answer was an actual substring and is easier to view the result, but jcollado's answer lets me pipe it to the clipboard with no EOL character in the way.
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你想要这样的东西吗：
Do you want something like this:
使用
head -c/--bytes怎么样？What about using
head -c/--bytes?我想出了：
和
但两者看起来都像是我在用大锤敲钉子。
I had come up with:
and
But both seemed like I was using a sledgehammer to hit a nail.
这可能对你有用：
This might work for you:
如果
your_command_here是cat：If
your_command_hereiscat: