测试-h和测试-L之间的区别 [英] Difference between test -h and test -L

问题描述

在ksh shell中，test -L filename和test -h filename之间有什么区别.在手册页中，这两个都用于标识符号链接，但是我想知道确切的区别.

What is the difference between test -L filename and test -h filename in ksh shell. From the man page, both were used to identify a symbolic link, but I want to know the exact difference.

这是手册页中的描述.

 -h file                 True if file exists and  is  a  sym-
                         bolic link.
 -L file                 True if file exists and  is  a  sym-
                         bolic link.

推荐答案

文件bltins/test.c中ksh93的源代码显示这两个选项的处理方式完全相同，除了作者对未来的希望之外:

The source code for ksh93, in file bltins/test.c, shows that these two options are treated exactly the same, except for the author's hopes for the future:

        case 'L':
        case 'h': /* undocumented, and hopefully will disappear */
            if(*arg==0 || arg[strlen(arg)-1]=='/' || lstat(arg,&statb)<0)
                    return(0);
            return(S_ISLNK(statb.st_mode));

据此我得出结论，它们的行为完全相同，但是-h是一种遗留选项，可能有一天会消失:-)

From this I conclude that they behave exactly the same, but that -h is a legacy option and may one day disappear :-)

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