如何在tcl中更改目录文件的状态？

Question

The thing is, I was assigned to do a tcl script that can change the status of the directory file. I used the file stat *name* array command to display the inodes, like this:

file stat $f arr

if { $g eq "size" } { 
  puts "size: $arr(size)"
}
if { $g eq "inode" } {
  puts "inode: $arr(ino)"
}
if { $g eq "type" } {
  puts "type: $arr(type)"
}

...

What should I use to change it? All I can do for now is to access and display it.

Answer 1

Not everything in the OS stat structure (which file stat really wraps) is modifiable by user code. Some things are managed by the OS entirely, and are set at the time of the creation of the “file” and cannot be altered later. For example, you can't change the type : a file isn't a directory or a socket or … and the device and inode number are effectively a unique identifier for the file independent of its name and never change.

The atime and mtime fields can be set (via file atime and file mtime ) and the permissions bits via file attributes . The ownership fields are theoretically settable (also via file attributes ) but you probably haven't got permission to do so, and the link count is sort-of settable by creating hard links (with file link ) or deleting them ( file delete ).

The size just reflects how many bytes are in the file: don't think of setting it so much as writing to the file.