--- Nicolas SABOURET <[EMAIL PROTECTED]> wrote: > Nicolas
SABOURET wrote:
> >
> > if [ grep -c "cha�ne" -gt 0 ]; then ...
> >
>
> grep -c "chaine" nomfichier en fait, et entre ` (backquote) si c'est
> dans le "if".
>
> Pardon d'avoir �t� approximatif.
>
Je dirais m�me plus : �tant donn� que le fichier peut �tre tr�s gros,
il est s�rement plus indiqu� de sortir d�s qu'une occurence est
trouv�e, et non pas aller jusqu'� la fin pour compter toutes les
occurences (option -c).
Extrait du man de grep :
-q, --quiet, --silent
Quiet; suppress normal output. The scanning will
stop on the first match. Also see the -s or --no-
messages option below.
[...]
-s, --no-messages
Suppress error messages about nonexistent or
unreadable files. Portability note: unlike GNU
grep, traditional grep did not conform to POSIX.2,
because traditional grep lacked a -q option and its
-s option behaved like GNU grep's -q option. Shell
scripts intended to be portable to traditional grep
should avoid both -q and -s and should redirect
output to /dev/null instead.
Donc un -q me semble plus appropri� dans le cas d'un grep conformant �
POSIX.2 (cas du grep GNU), ou -s pour un grep "traditionnel" ...
Le test se fait alors sur le code de sortie (stock� dans la variable
shell $?) :
Normally, exit status is 0 if matches were found, and 1 if
no matches were found. (The -v option inverts the sense
of the exit status.) Exit status is 2 if there were syn-
tax errors in the pattern, inaccessible input files, or
other system errors.
Fran�ois.
=====
Francois BOTTIN
--
"How kind," the PFY sighs. "But where will I go?"
"Somewhere where they know nothing about computing...
where they wouldn't know a RAM chip from a potato chip!"
"But I don't want to visit Microsoft!" he whines.
The BOFH 1998 - Simon Travaglia (bofh.ntk.net)
________________________________________________________________
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