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  • In most *nix operating systems, you have to be running as root (a.k.a. superuser) to create a hardlink to a directory. The operation is restricted because it can make a mess of a file system. See Linux: How does hard-linking to a directory work? Commented Oct 11, 2014 at 17:55
  • @G-Man I'm running as root, but than I use ln command, it displays an error: .... is a directory. I read manual about ln. This command in Solaris has only 3 settings: -f-n (about messages), -s (symbolic link). So I can't use ln in this case. Commented Oct 11, 2014 at 18:15
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    Oh, yes, belt and suspenders. The operating system doesn't allow a process to create a hardlink to a directory unless it's running as root -- but also the ln program doesn't allow a user (any user) to do it. (1) Check the man page for ln on your system. There may be an option (like -d or -F) to tell ln to override the restriction. (2) Check to see whether you have a link command. (3) If those don't work, try writing a one-line C program to call the link system call. Commented Oct 11, 2014 at 18:22
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    @G-Man link command works. Thank you very much. Commented Oct 11, 2014 at 18:30