| There is
|
| (defvar grep-program "egrep" ...)
|
| in compile.el,
|
| No there isn't. The default value of grep-program is "grep" or "zgrep".
| What version are you looking at?
21.3 + 21.4[1] use plain grep [2] in compile.el. The zgrep has
been commented out.
| but in some systems the grep is the old one, which does
| not provide the extended syntax. Would it be possible to set this by
| default to 'egrep'?
|
| Sorry, no. Emacs's regexp syntax is based on the grep syntax rather
| than the egrep syntax.
I was referring to the calls of the external processes:
M-x grep RET
Run grep (like this): grep -n -e .....
or
M-x find-grep-dired RET
...
find . \( -type f -exec grep -q "*xyz" {} \; \) -exec ls -ld {} \;
or
M-x grep-find
Run find (like this): find . -type f -print0 | xargs -0 -e grep -n -e
The use of grep(1) command in all of there is not optimal. So my question
was wheather there were any *nix OS that did not define egrep(1) and thus
would prevent using "egrep" as a default value. The problem with standard
grep(1) is that is does not allow extended syntax:
.... grep -n '(this|that)'
E.g in SunOS. The standard "grep" isn't very useful default
for serious searching.
Jari
------------------------------
[1]
(emacs-version)
"GNU Emacs 21.4.1 (i386-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
of 2005-03-17 on trouble, modified by Debian"
[1]
(defvar grep-program
;; Currently zgrep has trouble. It runs egrep instead of grep,
;; and it doesn't pass along long options right.
"grep"
;; (if (equal (condition-case nil ; in case "zgrep" isn't in exec-path
;; (call-process "zgrep" nil nil nil
;; "foo" null-device)
;; (error nil))
;; 1)
;; "zgrep"
;; "grep")
"The default grep program for `grep-command' and `grep-find-command'.
This variable's value takes effect when `grep-compute-defaults' is called.")
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