KSH：

KSH：-eq和=之间的差异(KSH: diference between -eq and =)

假设我有这个小程序：

until [ "$name" = "$secretname" ] do read name done

而不是使用=，如果我使用-eq它仍然有效。

是否有理由在“-eq”上使用“=”

Let say I have this small program:

until [ "$name" = "$secretname" ] do read name done

Instead of using =, if i used -eq it still works.

Is there a reason for using the "=" over the "-eq"

最满意答案

-eq仅用于比较整数。 它将忽略前导零：

$ test 09 -eq 9 && echo match || echo no match match

如果参数不是整数，它也会报告错误：

$ test abc -eq abc && echo match || echo no match bash: test: abc: integer expression expected no match

=用于比较任意字符串

$ test abc = abc && echo match || echo no match match $ test 09 = 9 && echo match || echo no match no match

-eq is only for comparing integers. It will ignore leading zeroes:

$ test 09 -eq 9 && echo match || echo no match match

It will also report an error if the arguments are not integers:

$ test abc -eq abc && echo match || echo no match bash: test: abc: integer expression expected no match

= is for comparing arbitrary strings

$ test abc = abc && echo match || echo no match match $ test 09 = 9 && echo match || echo no match no match