07-14-2010
It simply uses extended regular expressions by default instead of basic regular expressions. You can do the same with 'grep -E'.
In extended regular expressions, parenthesis are metacharactes which are used for grouping and capturing; thus, they must be escaped if they are to be matched literally. In basic regular expressions, the parenthesis are not metacharacters and must be quoted if they are to be used to capture or group.
Although egrep defaults to using a more powerful regular expression language, the command itself is not in any way more robust ... imo.
Regards,
Alister
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zfgrep
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