August 2012
Intermediate to advanced
624 pages
17h 11m
Polish
Content preview from Bash. Receptury
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Operatory wyrażeń warunkowych
Operatory zestawione w Tabela A-9 są wykorzystywane w instrukcji test oraz w konstrukcjach [...] i [[...]]. Można je łączyć w logiczne wyrażenia za pomocą operatorów -a (iloczynu logicznego AND) i -o (sumy logicznej OR), a także grupować z użyciem nawiasów poprzedzonych znakami lewego ukośnika (\(...\)). Operatory porównania ciągów tekstowych < i > oraz konstrukcja [[...]] nie są dostępne w powłokach bash wcześniejszych niż 2.0, a operator =~ jest obsługiwany jedynie w powłokach bash 3.0 i późniejszych.
Tabela A-9. Operatory wyrażeń warunkowych
Operator | Zwraca wartość true jeśli |
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