12-19-2012
Usually, zip needs a zip archive file to save to. For compressed content, zip just copies, so there is no waste. Generally, compressing twice makes a third file bigger than the second.
You can make a compressed copy of an open file in a new file ( "compress <old >new" or "gzip <old >new" and zip as far as it works with open files ) but it lacks data integrity as the original is still growing. You can break really big files apart, especially logs with time stamps, where it is pretty easy to break them into days, months or years.
Usually, you rotate the log file first, so it is not attached, and then you archive it. Many servers will restart (reopen) the log, so you rename it (so the name is open -- legal while attached, as they are logging on an open fd to an inode unless they are shell scripts, and sometimes even (...)>then) and send then a signal with kill to the logging daemon. Many use 'logrotate' and 'cron' for this.
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BUNDLE(1) General Commands Manual BUNDLE(1)
NAME
bundle - collect files for distribution
SYNOPSIS
bundle file ...
DESCRIPTION
Bundle writes on its standard output a shell script for rc(1) or a Bourne shell which, when executed, will recreate the original files.
Its main use is for distributing small numbers of text files by mail(1).
Although less refined than standard archives from ar(1) or tar(1), a bundle file is self-documenting and complete; little preparation is
required on the receiving machine.
EXAMPLES
bundle mkfile *.[ch] | mail kremvax!boris
Send a makefile to Boris together with related and files. Upon receiving the mail, Boris may save the file sans postmark, say in
gift/horse, then do
cd gift; rc horse; mk
SOURCE
/rc/bin/bundle
SEE ALSO
ar(1), tar(1), mail(1)
BUGS
Bundle will not create directories and is unsatisfactory for non-text files.
Beware of gift horses.
BUNDLE(1)