什么更便携?回声-e或使用printf吗? [英] What is more portable? echo -e or using printf?

问题描述

我目前正在编写一个bash测试框架，该框架需要具有尽可能的可移植性.

I'm currently writing a bash testing framework, which requires to be as portable as possible.

因此，在某一点上，我必须先打印换行符，然后再打印一些包含多个扩展变量的文本.这是我使用的解决方案.

So, at one point, I had to print a leading newline followed by some text which contains several expanded variables. This is the solution I've used.

echo -e "\n$number_of_specs ${units}, $number_of_specs_failed failed"

这看起来还可以，但是我不确定与使用例如printf?

This seems okay but I'm not sure how portable that is compared to printing out the line using e.g. printf?

有什么想法或暗示可以在其中找到一些参考吗?

Any ideas or hints where I could find some references?

推荐答案

printf更具可移植性.始终应优先于echo -e.如果专门针对bash/zsh/ksh，echo $'...'也可以.如果专门针对zsh或ksh，则print没问题.

printf is more portable. It should always be preferred over echo -e. If targeting bash/zsh/ksh specifically, echo $'...' is also ok. If targeting zsh or ksh specifically, print is ok.

• http://cfajohnson.com/shell/cus-faq.html#Q0b
• http://www.in-ulm.de/~mascheck/various/echo+ printf/
• http://pubs.opengroup.org/onlinepubs/9699919799/utilities/echo.html #tag_20_37_16

• http://cfajohnson.com/shell/cus-faq.html#Q0b
• http://www.in-ulm.de/~mascheck/various/echo+printf/
• http://pubs.opengroup.org/onlinepubs/9699919799/utilities/echo.html#tag_20_37_16

POSIX(最后一个链接)还讨论了echo -n问题，也应避免这些问题.基本上，切勿使用echo的选项，并且出于可移植性，请使用printf.)

POSIX (last link) also discusses echo -n problems, which should also be avoided. Basically, never use options to echo, and for portability, use printf.)

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