When I type
mv ../* .
mv: cannot move '../<dir name>' to a subdirectory of itself, './<dir name>'
How does the shell/mv command detect this behaviour?
When I type mv ../* . mv: cannot move ‘../<dir name>’ to a subdirectory
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When I type
mv ../* .
mv: cannot move '../<dir name>' to a subdirectory of itself, './<dir name>'
How does the shell/mv command detect this behaviour?
As far as I know, mv uses the
rename()POSIX syscall, for which the specification says:… along with a myriad of other detailed failure modes.
The operating system presumably implements the detection at the general VFS layer by comparing the inode numbers of the intermediate directories along the hierarchy.