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Full Discussion: Copy file only if newer
Top Forums Shell Programming and Scripting Copy file only if newer Post 303024486 by RudiC on Tuesday 9th of October 2018 03:03:55 PM
Old 10-09-2018
You need to be very fast to not copy your file - the -u, --update option, copies "only when the SOURCE file is newer than the destination file or when the destination file is missing". You'd need to copy twice within a minute to hit a file with the same name older than your actual one.
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ZIPMERGE(1)						      General Commands Manual						       ZIPMERGE(1)

NAME
zipmerge - merge zip archives SYNOPSIS
zipmerge [-DhIiSsV] target-zip source-zip Op source-zip ... DESCRIPTION
zipmerge merges the source zip archives source-zip into the target zip archive target-zip. By default, files in the source zip archives overwrite existing files of the same name in the target zip archive. Supported options: -D Ignore directory components in file name comparisons. -h Display a short help message and exit. -I Ignore case in file name comparisons -i Ask before overwriting files. See also -s. -S Do not overwrite files that have the same size and CRC32 in both the source and target archives. -s When -i is given, do not before overwriting files that have the same size and CRC32. -V Display version information and exit. EXIT STATUS
zipmerge exits 0 on success and 1 if an error occurred. SEE ALSO
zipcmp(1), ziptorrent(1), libzip(3) AUTHORS
Dieter Baron <dillo@giga.or.at> and Thomas Klausner <tk@giga.or.at> NiH June 4, 2008 ZIPMERGE(1)
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