06-12-2013
grep works with regular expressions (basic or extended) which differ from the shells pattern matching on filenames. If you use a * in a regular expression, it matches the preceding item zero or more time. Meaning you filtered for lines containing "ora_db" followed by zero or more "w".
In addition, if you do not quote the pattern, the shell will expand the *, if it can. So if you have a file "ora_dbw123" in your working directory for example, the shell will replace ora_dbw* with ora_dbw123 before executing grep.
See
Man Page for grep for more details.
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ZGREP(1) General Commands Manual ZGREP(1)
NAME
zgrep - search possibly compressed files for a regular expression
SYNOPSIS
zgrep [ grep_options ] [ -e ] pattern filename...
DESCRIPTION
Zgrep invokes grep on compressed or gzipped files. These grep options will cause zgrep to terminate with an error code:
(-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*). All other options specified are passed directly to grep. If no file is specified, then the
standard input is decompressed if necessary and fed to grep. Otherwise the given files are uncompressed if necessary and fed to grep.
If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.
EXIT CODE
2 - An option that is not supported was specified.
AUTHOR
Charles Levert (charles@comm.polymtl.ca)
SEE ALSO
grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)
ZGREP(1)