symlink creates a symbolic link named newpath which contains the string oldpath.
Symbolic links are interpreted at run-time as if the contents of the link had been substituted into the path being followed to find a file or directory.
Symbolic links may contain .. path components, which (if used at the start of the link) refer to the parent directories of that in which the link resides.
A symbolic link (also known as a soft link) may point to an existing file or to a nonexistent one; the latter case is known as a dangling link.
The permissions of a symbolic link are irrelevant; the ownership is ignored when following the link, but is checked when removal or renaming of the link is requested and the link is in a directory with the sticky bit set.
The filesystem containing newpath does not support the creation of symbolic links.
oldpath or newpath points outside your accessible address space.
Write access to the directory containing newpath is not allowed for the process's effective uid, or one of the directories in newpath did not allow search (execute) permission.
oldpath or newpath was too long.
A directory component in newpath does not exist or is a dangling symbolic link, or oldpath is the empty string.
A component used as a directory in newpath is not, in fact, a directory.
Insufficient kernel memory was available.
newpath is on a read-only filesystem.
newpath already exists.
Too many symbolic links were encountered in resolving newpath.
The device containing the file has no room for the new directory entry.
No checking of oldpath is done.