Linux cp命令无法强制覆盖

在Linux系统里面,使用cp可以拷贝文件, 遇到覆盖的文件会提示是否覆盖, 这是出于安全考虑.
但是如果我们明知需要覆盖并且需要拷贝多个文件或目录的时候,只能单条操作,比较麻烦.

cp参数

查看cp的参数:

[root@bob ~]# cp --help
Usage: cp [OPTION]... [-T] SOURCE DEST
  or:  cp [OPTION]... SOURCE... DIRECTORY
  or:  cp [OPTION]... -t DIRECTORY SOURCE...
Copy SOURCE to DEST, or multiple SOURCE(s) to DIRECTORY.
  
  -a, --archive                same as -dR --preserve=all
      --attributes-only        don't copy the file data, just the attributes
      --backup[=CONTROL]       make a backup of each existing destination file
  -b                           like --backup but does not accept an argument
      --copy-contents          copy contents of special files when recursive
  -d                           same as --no-dereference --preserve=links
  -f, --force                  if an existing destination file cannot be
                                 opened, remove it and try again (this option
                                 is ignored when the -n option is also used)
  -i, --interactive            prompt before overwrite (overrides a previous -n
                                  option)
  -H                           follow command-line symbolic links in SOURCE
  -l, --link                   hard link files instead of copying
  -L, --dereference            always follow symbolic links in SOURCE
  -n, --no-clobber             do not overwrite an existing file (overrides
                                 a previous -i option)
  -P, --no-dereference         never follow symbolic links in SOURCE
  -p                           same as --preserve=mode,ownership,timestamps
      --preserve[=ATTR_LIST]   preserve the specified attributes (default:
                                 mode,ownership,timestamps), if possible
                                 additional attributes: context, links, xattr,
                                 all
  -c                           deprecated, same as --preserve=context
      --no-preserve=ATTR_LIST  don't preserve the specified attributes
      --parents                use full source file name under DIRECTORY
  -R, -r, --recursive          copy directories recursively
      --reflink[=WHEN]         control clone/CoW copies. See below
      --remove-destination     remove each existing destination file before
                                 attempting to open it (contrast with --force)
      --sparse=WHEN            control creation of sparse files. See below
      --strip-trailing-slashes  remove any trailing slashes from each SOURCE
                                 argument
  -s, --symbolic-link          make symbolic links instead of copying
  -S, --suffix=SUFFIX          override the usual backup suffix
  -t, --target-directory=DIRECTORY  copy all SOURCE arguments into DIRECTORY
  -T, --no-target-directory    treat DEST as a normal file
  -u, --update                 copy only when the SOURCE file is newer
                                 than the destination file or when the
                                 destination file is missing
  -v, --verbose                explain what is being done
  -x, --one-file-system        stay on this file system
  -Z                           set SELinux security context of destination
                                 file to default type
      --context[=CTX]          like -Z, or if CTX is specified then set the
                                 SELinux or SMACK security context to CTX
      --help     display this help and exit
      --version  output version information and exit

强制拷贝

其中-f (--force)就是强制覆盖不提示.
命令如下:

cp -f xxx /opt/www/xxx

但实际执行的时候依然会提示是否覆盖.原因是为了安全考虑,系统把cp命令加了个参数-i 提示,可以查看alias

[root@bob ~]# alias
alias cp='cp -i'

除了cp还有mv,rm两个命令都是这样处理的.

解决方法

方法1：

[root@bob ~]# vi ~/.bashrc

在alias cp=’cp -i’前加上#注释掉这行，:wq保存退出，然后重新登陆就可以了。

方法2：

拷贝时加\,如

[root@bob ~]#\cp src dst

方法3：

临时取消cp的alias

[root@bob ~]#unalias cp
[root@bob ~]#cp a /test/a

大家试试吧.

参考:https://blog.csdn.net/lanmolei814/article/details/37725999/