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bash kurz & gut, Second Edition by Karsten Guenther

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Redirections in Schleifen

In Schleifen vom Typ while („Kontrollstrukturen“), for („Kontrollstrukturen“) und until („Kontrollstrukturen“) erfolgen Redirections erst am Ende des Konstrukts: Gleiches gilt natürlich auch für Ausgaben und Pipelines.

while ... do
...
done < Umleitung

oder:

for ...
...
done > Umleitung

oder:

until ...
...
done |...

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