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Test Your Knowledge in Computers #161
Difficulty: Easy
Application programmers are typically concerned only with interfaces in the application layer and often also in the transport layer, while the layers below are services provided by the TCP/IP stack in the operating system.
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cp(1) [bsd man page]

CP(1)							      General Commands Manual							     CP(1)

NAME
cp - copy SYNOPSIS
cp [ -ip ] file1 file2 cp [ -ipr ] file ... directory DESCRIPTION
File1 is copied onto file2. By default, the mode and owner of file2 are preserved if it already existed; otherwise the mode of the source file modified by the current umask(2) is used. The -p option causes cp to attempt to preserve (duplicate) in its copies the modification times and modes of the source files, ignoring the present umask. In the second form, one or more files are copied into the directory with their original file-names. Cp refuses to copy a file onto itself. If the -i option is specified, cp will prompt the user with the name of the file whenever the copy will cause an old file to be overwrit- ten. An answer of 'y' will cause cp to continue. Any other answer will prevent it from overwriting the file. If the -r option is specified and any of the source files are directories, cp copies each subtree rooted at that name; in this case the destination must be a directory. SEE ALSO
cat(1), mv(1), rcp(1C) 4th Berkeley Distribution June 8, 1985 CP(1)

Check Out this Related Man Page

RCP(1)							    BSD General Commands Manual 						    RCP(1)

NAME
rcp -- remote file copy SYNOPSIS
rcp [-46p] file1 file2 rcp [-46pr] file ... directory DESCRIPTION
The rcp utility copies files between machines. Each file or directory argument is either a remote file name of the form ``ruser@rhost:path'', or a local file name (containing no ':' characters, or a '/' before any ':'s). The following options are available: -4 Use IPv4 addresses only. -6 Use IPv6 addresses only. -p Cause rcp to attempt to preserve (duplicate) in its copies the modification times and modes of the source files, ignoring the umask(2). By default, the mode and owner of file2 are preserved if it already existed; otherwise the mode of the source file modi- fied by the umask(2) on the destination host is used. -r If any of the source files are directories, rcp copies each subtree rooted at that name; in this case the destination must be a directory. If path is not a full path name, it is interpreted relative to the login directory of the specified user ruser on rhost, or your current user name if no other remote user name is specified. A path on a remote host may be quoted (using '', '"', or ''') so that the metacharacters are interpreted remotely. The rcp utility does not prompt for passwords; it performs remote execution via rsh(1), and requires the same authorization. The rcp utility handles third party copies, where neither source nor target files are on the current machine. SEE ALSO
cp(1), ftp(1), rlogin(1), rsh(1), hosts.equiv(5) HISTORY
The rcp command appeared in 4.2BSD. The version of rcp described here has been reimplemented with Kerberos in 4.3BSD-Reno. BUGS
Does not detect all cases where the target of a copy might be a file in cases where only a directory should be legal. Is confused by any output generated by commands in a .login, .profile, or .cshrc file on the remote host. The destination user and hostname may have to be specified as ``rhost.ruser'' when the destination machine is running the 4.2BSD version of rcp. BSD
October 16, 2002 BSD

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