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/