一行上的Unix打印输出 [英] Unix Print Output on One Line

问题描述

我正在创建Unix .bash_profile脚本，但遇到了一个小问题.这是我的代码段:

I am creating a Unix .bash_profile script, and I have run into a small problem. Here is a snippet of my code:

echo -n "Welcome "
whoami
echo -n "!"

我希望输出给出这样的内容:

I would like the output to give something like this:

Welcome jsmith!

...相反，我得到的是这样的东西:

... instead, I am getting something like this:

Welcome jsmith
!

如何将所有这些整合到一行?任何帮助是极大的赞赏.如果有帮助，我将在Ubuntu Server 10.04 LTS上使用Bash Shell.

How can I get all of this onto one line? Any help is greatly appreciated. If this helps, I am using the Bash Shell, on Ubuntu Server 10.04 LTS.

推荐答案

您可以插入$(command)(新样式)或`command`(旧样式)，以将命令的输出插入双引号字符串中./p>

You can insert $(command) (new style) or `command` (old style) to insert the output of a command into a double-quoted string.

echo "Welcome $(whoami)!"

注意:在脚本中，此方法可以正常工作.如果您在交互式命令行上尝试使用该命令，最终的!可能会给您带来麻烦，因为!会触发历史扩展.

Note: In a script this will work fine. If you try it at an interactive command line the final ! may cause you trouble as ! triggers history expansion.

命令替换

命令替换允许命令的输出替换命令名称.有两种形式:

Command Substitution

Command substitution allows the output of a command to replace the command name. There are two forms:

$(command)

或

`command`

Bash通过执行命令并将命令替换替换为命令的标准输出(，并删除所有尾随的换行符 [强调])来执行扩展.

Bash performs the expansion by executing command and replacing the command substitution with the standard output of the command, with any trailing newlines deleted [emphasis added].

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