utils/#7: rm: Confirmation issues
Check whether to ask for confirmation or not, particularly in these cases:
- operation likely to fail due to permissions;
- terminal is interactive but -i and -f were not specified.
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By the way, if it's not obvious already, I took it.
Spurious error messages when the end of file is reached on the standard input were fixed.
Use of the access() system call may help in this.