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In DOS systems, file directory entries include a Hidden file attribute which is manipulated using the attrib command. Using the command line command dir /ah displays the files with the Hidden attribute. In addition, there is a System file attribute that can be set on a file, which also causes the file to be hidden in directory listings.
In DOS, OS/2 and Windows, the attrib command in cmd.exe and command.com can be used to change and display the four traditional file attributes. [3] [9] File Explorer in Windows can show the seven mentioned attributes but cannot set or clear the System attribute. [5]
It defaults to display the attributes of all files in the current directory. The file attributes available include read-only, archive, system, and hidden attributes. The command has the capability to process whole folders and subfolders of files and also process all files. The command is available in MS-DOS versions 3 and later. [1]
For example, as of release MS-DOS 4.0, the first six bits of the file attribute byte indicated whether or not a file was read-only (as opposed to writeable), hidden, a system file, a volume label, a subdirectory, or if the file had been "archived" (with the bit being set if the file had changed since the last use of the BACKUP command). [6]
ATTRIB: Set or display file attributes. BACKUP / RESTORE: simple backup and restore utilities. CHKDSK: Check disk for file system integrity. COMP: File compare utility. DEBUG: Simple command line debugger. DELTREE: Delete a directory tree. DISKCOMP: Compare floppy disks. DISKCOPY: Copy floppy disks. DOSKEY: Command line editor.
The following command would delete the same files. C:\> FORFILES /P C:\Windows /M *.LOG /D -30 /C "CMD /C DEL @PATH" The use of CMD /C is required in the above examples, as both ECHO and DEL are internal to the command processor , rather than external utility programs.
rm (short for remove) is a basic command on Unix and Unix-like operating systems used to remove objects such as computer files, directories and symbolic links from file systems and also special files such as device nodes, pipes and sockets, similar to the del command in MS-DOS, OS/2, and Microsoft Windows.
In Unix and Unix-like operating systems, chmod is the command and system call used to change the access permissions and the special mode flags (the setuid, setgid, and sticky flags) of file system objects (files and directories). Collectively these were originally called its modes, [1] and the name chmod was chosen as an abbreviation of change ...