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Full Discussion: Appending a GZIP File
Top Forums Shell Programming and Scripting Appending a GZIP File Post 302369679 by mohan_xunil on Monday 9th of November 2009 09:10:39 AM
Old 11-09-2009
sorry ggs,

It is typo err

the actual second case is like

zcat a.gz |gzip >>d.gz
zcat b.gz |gzip >>d.gz
zcat c.gz |gzip >>d.gz


please let me know the exact diffenrence with gzip headers
 

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ZGREP(1)						    BSD General Commands Manual 						  ZGREP(1)

NAME
zgrep, zegrep, zfgrep -- print lines matching a pattern in gzip-compressed files SYNOPSIS
zgrep [grep-flags] [--] pattern [files ...] zegrep [grep-flags] [--] pattern [file ...] zfgrep [grep-flags] [--] pattern [file ...] DESCRIPTION
zgrep runs grep(1) on files or stdin, if no files argument is given, after decompressing them with zcat(1). The grep-flags and pattern arguments are passed on to grep(1). If an -e flag is found in the grep-flags, zgrep will not look for a pattern argument. zegrep calls egrep(1), while zfgrep calls fgrep(1). EXIT STATUS
In case of missing arguments or missing pattern, 1 will be returned, otherwise 0. SEE ALSO
egrep(1), fgrep(1), grep(1), gzip(1), zcat(1) AUTHORS
Thomas Klausner <wiz@NetBSD.org> BSD
December 28, 2003 BSD
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