rm.1

<B>Digital的Unix操作系统VAX 4.2源码</B>

.\" SCCSID: @(#)rm.1	8.1	9/11/90
.TH rm 1
.SH Name
rm, rmdir \- remove (unlink) files or directories
.SH Syntax
\fBrm\fR [\fB\-f\fR] [\fB\-r\fR] [\fB\-i\fR] [\fB\-\fR] \fIfile-or-directory-name...
.br
\fBrmdir\fI directory-name...
.SH Description
.NXR "rm command"
.NXR "rmdir command (general)"
.NXR "file" "removing"
.NXR "directory" "removing"
The
.PN rm
command removes the entries for one or more files from a directory.
If there are no links to the file 
then the file is destroyed.
For further information, see 
.MS ln 1 . 
.PP
The
.PN rmdir
command removes entries for the named directories, which must be
empty.  If they are not empty, the directories remain, and
.PN rmdir 
displays an error message (see EXAMPLES).
.PP
To remove a file, you must have write permission in its directory,
but you do not need read or write permission on the file itself.
When you are using
.PN rm
from a terminal, and you do not have write permission on the file, 
the
.PN rm
command asks for confirmation before destroying the file. 
.PP
If input 
is redirected from the standard input device (your terminal),
then
.PN rm
checks to ensure
that input is not coming from your terminal.  If not, 
.PN rm
sets the \fB\-f\fR option, which overrides the file protection,
and removes the files silently, regardless of what you have
specified in the file redirected as input to 
.PN rm .
See EXAMPLES.
.SH Options
.NXR "rm command" "options"
.IP \fB\-\fR 5
Specifies that the named files have names
beginning with a minus (for example
.PN \-myfile
).
.IP \fB\-f\fR 
Forces the removal of file or directory without first requesting confirmation.  
Only system or usage messages are displayed.
.IP \fB\-i\fR  
Prompts for yes or no response before removing each entry.  
Does not ask when combined with the \fB\-f\fR option.  If you
type a y, followed by any combination of characters, a yes response is assumed.
.IP \fB\-r\fR 
Recursively removes all entries from the specified directory and, then, 
removes the entry for that directory from its parent directory.  
.SH Examples
The following example shows how to remove a file in
your current working directory.
.NXR(e) "rm command" "removing file"
.EX
rm myfile
.EE
This example shows use of the null option to remove
a file beginning with a minus sign.
.EX
rm \- \-gorp
.EE
This example shows how a confirmation is requested 
for removal of a file for which you do not have
write permission.
.NXR(e) "rm command" "confirming file removal"
.EX
rm testfile
rm: override protection 400 for testfile? y
.EE
This example shows how the combination of \fB\-i\fR
and \fB\-r\fR options lets you examine all the files in a
directory before removing them.   
.NXR(e) "rm command" "examining files"
In the example,
mydirectory
is a subdirectory of the current working directory.
Note that the last question requests confirmation before 
removing the directory itself.  Although the user
types ``y'', requesting removal of the directory,
the 
.PN rm
command does not allow this, because the directory
is not empty; the user typed ``n'' to the question
about the file
.I file2 ,
so 
.I file2
was not removed.
.EX
rm \-ir mydirectory
rm: remove mydirectory/file1? y
rm: remove mydirectory/file2? n
      .
      .
      .
rm: remove mydirectory? y
rm: mydirectory: Directory not empty
.EE
This example illustrates that 
.PN rm
overrides file protection when input is redirected from
the standard input device.  The user creates a file
named ``alfie'', with a read-only file protection.  The
user then creates a file named ``ans'' to contain the
character ``n''.  The
.PN rm 
command
following destroys the file ``alfie'', even though the
redirected input file requested no deletion.
.EX
cat > alfie
hello
^d
chmod 444 alfie
cat > ans
n
^d
rm < ans alfie
.EE
.SH See Also
unlink(2)