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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gzforce
GZFORCE(1) General Commands Manual GZFORCE(1)
NAME
gzforce - force a '.gz' extension on all gzip files
SYNOPSIS
gzforce [ name ... ]
DESCRIPTION
gzforce forces a .gz extension on all gzip files so that gzip will not compress them twice. This can be useful for files with names trun-
cated after a file transfer. On systems with a 14 char limitation on file names, the original name is truncated to make room for the .gz
suffix. For example, 12345678901234 is renamed to 12345678901.gz. A file name such as foo.tgz is left intact.
SEE ALSO
gzip(1), gznew(1), gzmore(1), gzgrep(1), gzdiff(1), gzexe(1)
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Availability | SUNWgzip |
+--------------------+-----------------+
|Interface Stability | External |
+--------------------+-----------------+
NOTES
Source for gzip is available in the SUNWgzipS package.
GZFORCE(1)