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Top Forums Shell Programming and Scripting Compare file dates before copy Post 303021425 by Neo on Thursday 9th of August 2018 08:31:17 AM
Old 08-09-2018
Normally, when we make backups, we put the date of the backup in the name of the file.

So, if you do this using a standard UNIX time, it is very easy to parse than info out of the filename and compare.

Example:

Code:
mybackupfile.1533817852.tar.gz

 

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MV(1)									FSF								     MV(1)

NAME
mv - move (rename) files SYNOPSIS
mv [OPTION]... SOURCE DEST mv [OPTION]... SOURCE... DIRECTORY mv [OPTION]... --target-directory=DIRECTORY SOURCE... DESCRIPTION
Rename SOURCE to DEST, or move SOURCE(s) to DIRECTORY. Mandatory arguments to long options are mandatory for short options too. --backup[=CONTROL] make a backup of each existing destination file -b like --backup but does not accept an argument -f, --force do not prompt before overwriting equivalent to --reply=yes -i, --interactive prompt before overwrite equivalent to --reply=query --reply={yes,no,query} specify how to handle the prompt about an existing destination file --strip-trailing-slashes remove any trailing slashes from each SOURCE argument -S, --suffix=SUFFIX override the usual backup suffix --target-directory=DIRECTORY move all SOURCE arguments into DIRECTORY -u, --update move 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 --help display this help and exit --version output version information and exit 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 AUTHOR
Written by Mike Parker, 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 mv is maintained as a Texinfo manual. If the info and mv programs are properly installed at your site, the com- mand info mv should give you access to the complete manual. mv (coreutils) 4.5.3 February 2003 MV(1)
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