04-19-2013
From my understanding ( non anglophone world...), you are not far from succeeding...
But from a) to b) I dont understand "and exit" at the end of a) but as mentionned I may be wrong in understanding, but in my logic to process an existing file, the prerequisite is to have a backup directory and so after check of existence and creation if non existent you continue (and so no else/elif ...) for you would end with not processing a existing file because you had no backup directory...
c) crazy guys like sysadms like to keep files with their timestamp so we would cp with the according arguments...even more we would use the date as a suffix so the file would not be overwritten by mistake, and it would be more in the "spirit" of having backups in such way you could have in your log file e.g. a long with long listing of the new file created...
d) I see no log file created...
e) what comforts me in my understang here is this task, if you were to copy the file "as it is", here you would only have one file with just the timestamp changing (well ok and size...)
Do you agree?
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CP(1) FSF CP(1)
NAME
cp - copy files and directories
SYNOPSIS
cp [OPTION]... SOURCE DEST
cp [OPTION]... SOURCE... DIRECTORY
cp [OPTION]... --target-directory=DIRECTORY SOURCE...
DESCRIPTION
Copy SOURCE to DEST, or multiple SOURCE(s) to DIRECTORY.
Mandatory arguments to long options are mandatory for short options too.
-a, --archive
same as -dpR
--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=link
--no-dereference
never follow symbolic links
-f, --force
if an existing destination file cannot be opened, remove it and try again
-i, --interactive
prompt before overwrite
-H follow command-line symbolic links
-l, --link
link files instead of copying
-L, --dereference
always follow symbolic links
-p same as --preserve=mode,ownership,timestamps
--preserve[=ATTR_LIST]
preserve the specified attributes (default: mode,ownership,timestamps), if possible additional attributes: links, all
--no-preserve=ATTR_LIST
don't preserve the specified attributes
--parents
append source path to DIRECTORY
-P same as `--no-dereference'
-R, -r, --recursive
copy directories recursively
--remove-destination
remove each existing destination file before attempting to open it (contrast with --force)
--reply={yes,no,query}
specify how to handle the prompt about an existing destination file
--sparse=WHEN
control creation of sparse files
--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
--target-directory=DIRECTORY
move all SOURCE arguments into DIRECTORY
-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
--help display this help and exit
--version
output version information and exit
By default, sparse SOURCE files are detected by a crude heuristic and the corresponding DEST file is made sparse as well. That is the
behavior selected by --sparse=auto. Specify --sparse=always to create a sparse DEST file whenever the SOURCE file contains a long enough
sequence of zero bytes. Use --sparse=never to inhibit creation of sparse files.
The backup suffix is `~', unless set with --suffix or SIMPLE_BACKUP_SUFFIX. The version control method may be selected via the --backup
option or through the VERSION_CONTROL environment variable. Here are the values:
none, off
never make backups (even if --backup is given)
numbered, t
make numbered backups
existing, nil
numbered if numbered backups exist, simple otherwise
simple, never
always make simple backups
As a special case, cp makes a backup of SOURCE when the force and backup options are given and SOURCE and DEST are the same name for an
existing, regular file.
AUTHOR
Written by Torbjorn Granlund, David MacKenzie, and Jim Meyering.
REPORTING BUGS
Report bugs to <bug-coreutils@gnu.org>.
COPYRIGHT
Copyright (C) 2002 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
LAR PURPOSE.
SEE ALSO
The full documentation for cp is maintained as a Texinfo manual. If the info and cp programs are properly installed at your site, the com-
mand
info cp
should give you access to the complete manual.
cp (coreutils) 4.5.3 February 2003 CP(1)