Hello xavnug Petit cours express de awk. Si on réécrit le script proposé par dubcek sous forme de fichier on obtient : script.awk On voit donc clairement deux règles : Donc : À noter que le script en l'état est un peu laxiste, car si une ligne contient par exemple "id : my_name" alors la deuxième règle s'applique. Même limitation sur une ligne qui contient "pouet : id". Donc on écrirait plutôt : fichier.txt script.awk Les expressions régulières (aussi appelées expressions rationnelles) sont, comme leur nom le suggère, une manière de caractériser un langage régulier(aussi appelé langage rationnel)à l'aide d'une chaîne de caractère.Cette chaîne de caractère implique des symboles(les caractères de l'alphabet considéré) et des métacaractères (les opérateurs des expressions régulières). Si dans une expression régulière on veut parler d'un symbole qui correspond à un métacaractère il faut donc l'échapper. Par exemple, comme * est un méta caractère, le symbole correspondant s'écrit \* ou [*]. Toute la syntaxe des expressions régulières est rappelée dans man awk. Voyons à présent les expressions régulières du script précédent. Si on teste ce script : ... on obtient alors : Bonne chance/id|name/ { print $0;}/name/ { print "";}
id : azertyname : qsdfg idpouet : name idid : poiuyname : mlkjh
/^(id|name)( |\t)*:/ { print $0;}/^name( |\t)*:/ { print "";}
awk -f script.awk fichier.txt
id : azertyname : qsdfg idid : poiuyname : mlkjh
Insérer un retour chariot après chaque occurence grep (2025)
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