bash 如何在bash中左对齐文本？
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How to left justify text in bash?
提问by Misha Moroshko
Given a text, $txt, how could I left justify it to a given width in Bash.
给定一个文本，$txt我怎么能在 Bash 中将它对齐到给定的宽度。
Example (width = 10):
示例（宽度 = 10）：
If $txt=hello, I would like to print:
如果$txt=hello，我想打印：
hello |
If $txt=1234567890, I would like to print:
如果$txt=1234567890，我想打印：
1234567890|
回答by drrlvn
You can use the printfcommand, like this:
您可以使用该printf命令，如下所示：
printf "%-10s |\n" "$txt"
The %smeans to interpret the argument as string, and the -10tells it to left justify to width 10 (negative numbers mean left justify while positive numbers justify to the right). The \nis required to print a newline, since printfdoesn't add one implicitly.
将%s参数解释为字符串的方法，并-10告诉它左对齐宽度为 10（负数表示左对齐，正数右对齐）。在\n需要打印一个换行符，因为printf不添加一个含蓄。
Notethat man printfbriefly describes this command, but the fullformat documentation can be found in the C function man page in man 3 printf.
请注意，man printf简要描述了此命令，但完整格式的文档可以在man 3 printf.
回答by jaypal singh
You can use the - flagfor left justification.
您可以使用- flagfor 左对齐。
Example:
例子：
[jaypal:~] printf "%10s\n" $txt
hello
[jaypal:~] printf "%-10s\n" $txt
hello
回答by SiegeX
bashcontains a printfbuiltin
bash包含一个printf内置
txt=1234567890
printf "%-10s\n" "$txt"
