命令簡介：
該命令用來刪除Linux系統中的文件或目錄。通常情況下rm不會刪除目錄，你必須通過指定參數-r或-R來刪除目錄。另外rm通常可以將該文件或目錄恢復（注意，rm刪除文件其實只是將指向數據塊的索引點（information nodes）釋放，只要不被覆蓋，數據其實還在硬盤上。如果想要保證文件的內容無法復原，可以使用命令shred 。 另外一般還是要慎用rm -rf *這樣的命令。
執行權限 ：All User
指令所在路徑：/bin/rm
命令語法：
rm [OPTION]... FILE...
命令參數：
| 參數 |
長參數 |
描敘 |
| -f |
--force |
強制刪除，忽略不存在的文件，從不給出提示。 |
| -i |
--interactive |
交互模式刪除文件，刪除文件前給出提示。 |
| -r |
--recursive |
遞歸的刪除目錄下面文件以及子目錄下文件。 |
| -R |
--recursive |
遞歸的刪除目錄下面文件以及子目錄下文件。 |
| -v |
--verbose |
顯示運行時詳細信息 |
| --help |
顯示命令在線幫助 |
|
| --version |
顯示命令版本信息 |
使用示例：
1：查看獲取rm命令的幫助信息。
[root@DB-Server kerry]# man rm
RM(1) User Commands RM(1)
NAME
rm - remove files or directories
SYNOPSIS
rm [OPTION]... FILE...
DESCRIPTION
This manual page documents the GNU version of rm. rm removes each specified file. By default, it does not remove directories.
If a file is unwritable, the standard input is a tty, and the -f or --force option is not given, rm prompts the user for whether to remove the file. If
the response is not affirmative, the file is skipped.
OPTIONS
Remove (unlink) the FILE(s).
-f, --force
ignore nonexistent files, never prompt
-i, --interactive
prompt before any removal
--no-preserve-root do not treat 鈥?鈥?specially (the default)
--preserve-root
fail to operate recursively on 鈥?鈥?
-r, -R, --recursive
remove directories and their contents recursively
-v, --verbose
explain what is being done
--help display this help and exit
--version
output version information and exit
By default, rm does not remove directories. Use the --recursive (-r or -R) option to remove each listed directory, too, along with all of its contents.
To remove a file whose name starts with a 鈥?鈥? for example 鈥?foo鈥? use one of these commands:
rm -- -foo
rm ./-foo
Note that if you use rm to remove a file, it is usually possible to recover the contents of that file. If you want more assurance that the contents are
truly unrecoverable, consider using shred.
AUTHOR
Written by Paul Rubin, David MacKenzie, Richard Stallman, and Jim Meyering.
REPORTING BUGS
Report bugs to <bug-coreutils@gnu.org>.
COPYRIGHT
Copyright 漏 2006 Free Software Foundation, Inc.
This is free software. You may redistribute copies of it under the terms of the GNU General Public License <http://www.gnu.org/licenses/gpl.html>. There
is NO WARRANTY, to the extent permitted by law.
SEE ALSO
chattr(1), shred(1)
The full documentation for rm is maintained as a Texinfo manual. If the info and rm programs are properly installed at your site, the command
info rm
should give you access to the complete manual.
rm 5.97 June 2011 RM(1)
[root@DB-Server kerry]# rm --help
Usage: rm [OPTION]... FILE...
Remove (unlink) the FILE(s).
-f, --force ignore nonexistent files, never prompt
-i, --interactive prompt before any removal
--no-preserve-root do not treat `/' specially (the default)
--preserve-root fail to operate recursively on `/'
-r, -R, --recursive remove directories and their contents recursively
-v, --verbose explain what is being done
--help display this help and exit
--version output version information and exit
By default, rm does not remove directories. Use the --recursive (-r or -R)
option to remove each listed directory, too, along with all of its contents.
To remove a file whose name starts with a `-', for example `-foo',
use one of these commands:
rm -- -foo
rm ./-foo
Note that if you use rm to remove a file, it is usually possible to recover
the contents of that file. If you want more assurance that the contents are
truly unrecoverable, consider using shred.
Report bugs to bug-coreutils@gnu.org.
2：刪除指定文件
如下所示，該目錄下有20個文件，刪除指定文件后，只剩下19個文件了。
[oracle@DB-Server bdump]$ ls -lrt | wc -l
20
[oracle@DB-Server bdump]$ rm gsp_lgwr_7826.trc
[oracle@DB-Server bdump]$ ls -lrt | wc -l
19
3：刪除文件顯示運行時詳細信息
[oracle@DB-Server bdump]$ rm -v gsp_lgwr_4617.trc
removed `gsp_lgwr_4617.trc'
4：交互模式下刪除文件
如下所示，輸入y后就會刪除文件，不想刪除則數據n
[oracle@DB-Server bdump]$ rm -iv gsp_lgwr_5005.trc
rm: remove regular file `gsp_lgwr_5005.trc'? y
removed `gsp_lgwr_5005.trc'
[oracle@DB-Server bdump]$ rm -iv gsp_lgwr_7826.trc
rm: remove regular file `gsp_lgwr_7826.trc'? n
5: 遞歸刪除某個目錄下文件以及子目錄
如下所示，kerry目錄下有test1.txt、 test2.txt 文件，以及子目錄tmp， 而子目錄下又有文件file1、file2.
[root@DB-Server ~]# tree kerry
kerry
|-- test1.txt
|-- test2.txt
`-- tmp
|-- file1
`-- file2
1 directory, 4 files
[root@DB-Server ~]# rm -rf kerry/
6: 刪除空目錄
[root@DB-Server ~]# mkdir kerry
[root@DB-Server ~]# rm -r kerry/
rm: remove directory `kerry/'? y
7：刪除目錄bdump下的所有trc文件類型的文件。
[oracle@DB-Server bdump]$ ls
alert_GSP.log gsp_lgwr_20025.trc gsp_lgwr_5023.trc gsp_p000_4637.trc gsp_p000_4718.trc gsp_p000_5025.trc gsp_p001_4639.trc gsp_p001_4720.trc gsp_p001_5027.trc
gsp_lgwr_19915.trc gsp_lgwr_4719.trc gsp_lgwr_5089.trc gsp_p000_4682.trc gsp_p000_4739.trc gsp_p000_5043.trc gsp_p001_4684.trc gsp_p001_4741.trc gsp_p001_5045.trc
[oracle@DB-Server bdump]$ rm -v *.trc
removed `gsp_lgwr_19915.trc'
removed `gsp_lgwr_20025.trc'
removed `gsp_lgwr_4719.trc'
removed `gsp_lgwr_5023.trc'
removed `gsp_lgwr_5089.trc'
removed `gsp_p000_4637.trc'
removed `gsp_p000_4682.trc'
removed `gsp_p000_4718.trc'
removed `gsp_p000_4739.trc'
removed `gsp_p000_5025.trc'
removed `gsp_p000_5043.trc'
removed `gsp_p001_4639.trc'
removed `gsp_p001_4684.trc'
removed `gsp_p001_4720.trc'
removed `gsp_p001_4741.trc'
removed `gsp_p001_5027.trc'
removed `gsp_p001_5045.trc'
參考資料：
http://www.cnblogs.com/peida/archive/2012/10/26/2740521.html