Re: Merci

plutôt qu'un print pour un xarg; autant attaquer directement le fichier.

ça coûte pas le même prix.

$ for i in $(seq 1 10) ; do echo coin > $i ; done # 10 fichiers contenant "coin"
$ strace -f -o "|grep execve" -e execve find . -type f -exec /bin/grep -s coin {} >/dev/null \;
15273 execve("/usr/bin/find", ["find", ".", "-type", "f", "-exec", "/bin/grep", "-s", "coin", "{}", ";"], [/* 67 vars */]) = 0
15275 execve("/bin/grep", ["/bin/grep", "-s", "coin", "./1"], [/* 67 vars */]) = 0
15276 execve("/bin/grep", ["/bin/grep", "-s", "coin", "./7"], [/* 67 vars */]) = 0
15277 execve("/bin/grep", ["/bin/grep", "-s", "coin", "./10"], [/* 67 vars */]) = 0
15278 execve("/bin/grep", ["/bin/grep", "-s", "coin", "./3"], [/* 67 vars */]) = 0
15279 execve("/bin/grep", ["/bin/grep", "-s", "coin", "./4"], [/* 67 vars */]) = 0
15280 execve("/bin/grep", ["/bin/grep", "-s", "coin", "./2"], [/* 67 vars */]) = 0
15281 execve("/bin/grep", ["/bin/grep", "-s", "coin", "./9"], [/* 67 vars */]) = 0
15282 execve("/bin/grep", ["/bin/grep", "-s", "coin", "./6"], [/* 67 vars */]) = 0
15283 execve("/bin/grep", ["/bin/grep", "-s", "coin", "./8"], [/* 67 vars */]) = 0
15284 execve("/bin/grep", ["/bin/grep", "-s", "coin", "./5"], [/* 67 vars */]) = 0
$ strace -f -o "|grep execve" -e execve find . -type f -exec /bin/grep -s coin {} +
15661 execve("/usr/bin/find", ["find", ".", "-type", "f", "-exec", "/bin/grep", "-s", "coin", "{}", "+"], [/* 67 vars */]) = 0
15663 execve("/bin/grep", ["/bin/grep", "-s", "coin", "./1", "./7", "./10", "./3", "./4", "./2", "./9", "./6", "./8", "./5"], [/* 67 vars */]) = 0
$ strace -f -o "|grep execve" -e execve sh -c "find . -type f -print0|xargs -0 /bin/grep -sh coin"
15393 execve("/bin/sh", ["sh", "-c", "find . -type f -print0|xargs -0 "...], [/* 67 vars */]) = 0
15395 execve("/usr/bin/find", ["find", ".", "-type", "f", "-print0"], [/* 67 vars */] <unfinished ...>
15396 execve("/usr/bin/xargs", ["xargs", "-0", "/bin/grep", "-sh", "coin"], [/* 67 vars */] <unfinished ...>
15397 execve("/bin/grep", ["/bin/grep", "-sh", "coin", "./1", "./7", "./10", "./3", "./4", "./2", "./9", "./6", "./8", "./5"], [/* 67 vars */] <unfinished ...>

donc onze processus (un find et 10 grep), deux (find, grep) ou trois (un find, un xargs et un grep) suivant les cas.

Remarque: le nombre de grep dans le 3^e cas peut augmenter suivant les limites d'xargs et du shell, mais il sera toujours largement inférieur au premier cas. Et on peut avoir des pièges comme le "|xargs tar cvf" qui est à proscrire.