September 2004
Intermediate to advanced
204 pages
5h 17m
German
Content preview from LINUX: kurz & gut
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Name
expr Ausdruck — /usr/bincoreutilsstdin stdout - datei -- opt --help --version
Der Befehl expr evaluiert einfache
mathematische und andere Ausdrücke auf der Kommandozeile:
$ expr 7 + 3
10
$ expr '(' 7 + 3 ')' '*' 14 Metazeichen der Shell in Anführungsstrichen
140
$ expr length ABCDEFG
7
$ expr 15 '>' 16
0Alle Argumente müssen durch Leerstellen voneinander getrennt
werden. Beachten Sie, dass Zeichen, die für die Shell eine besondere
Bedeutung haben, geschützt werden müssen. Klammern, die ebenfalls
geschützt werden müssen, können zum Gruppieren verwendet werden.
Tabelle 1-10 zeigt die Operatoren für
expr.
Tabelle 1-10. Operatoren für expr
Operator | Numerische Operation | String-Operation |
|---|---|---|
| Addition | |
| Subtraktion | |
| Multiplikation | |
| Integer-Division | |
| Division ... |
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.