10-09-2012
Quote:
Originally Posted by
jethro10
does fgrep works? i tried it once...
"fgrep" is a faster variant of "grep". It uses simplified regular expressions, but this speeds up its performance considerably. For small files this will make no big difference but with large files it can save a lot of time. On the other hand "fgrep" is not as versatile as "grep", so there indeed are cases where "grep" will do the job but "fgrep" won't.
As a general rule: use "fgrep" when you can and "grep" when you must.
Corollary: the same goes for "grep" and "egrep" - at least where they are different. "egrep" can do even more than "grep", but again at the expense of speed. Its operation is even slower than that of "grep". In some systems, though, one is just a hard link to the other because the makers saved some time and effort in silently merging these two tools.
I hope this helps.
bakunin
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GZGREP(1) General Commands Manual GZGREP(1)
NAME
gzgrep, gzegrep, gzfgrep - search possibly compressed files for a regular expression
SYNOPSIS
gzgrep [ grep_options ] [ -e ] pattern filename...
DESCRIPTION
gzgrep is used to invoke the grep on compress'ed or gzip'ed files. All options specified are passed directly to grep. If no file is speci-
fied, 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 gzgrep is invoked as gzegrep or gzfgrep then egrep or fgrep is used instead of grep. If the GREP environment variable is set, gzgrep
uses it as the grep program to be invoked. For example:
for sh: GREP=fgrep gzgrep string files
for csh: (setenv GREP fgrep; gzgrep string files)
AUTHOR
Charles Levert (charles@comm.polymtl.ca)
SEE ALSO
grep(1), egrep(1), fgrep(1), gzdiff(1), gzmore(1), gznew(1), gzforce(1), gzip(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.
GZGREP(1)