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
