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Full Discussion: Copy file only if newer
Top Forums Shell Programming and Scripting Copy file only if newer Post 303024490 by Don Cragun on Tuesday 9th of October 2018 04:16:02 PM
Old 10-09-2018
Yes, the test utility operator -nt stands for newer than. If you check the man page for the test utility on your system or look for the term "conditional expression" on the man page for your shell, you'll find lots of useful tests that can be performed in your shell scripts. (Note that "conditional expression" might be all lowercase, all uppercase, or have the first letter of each word capitalized depending on which shell's man page you're reading.)

Most of the operators that are available with the [[ command (if your shell has a [[ command) are also available with the test utility invoked with:
Code:
test expression

or with:
Code:
[ expression ]

The test and [ utilities are available with all Bourne shell derived shells.
 

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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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