December 2012
Intermediate to advanced
888 pages
48h 24m
English
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The shift Statement
You use the shift statement to process the positional parameters, one at a time, from left to right. Recall that the positional parameters are identified as $1, $2, $3, and so on. The effect of the shift command is that each positional parameter is moved one position to the left and the current $1 parameter is lost.
The shift statement is useful when you are writing shell programs in which a user can pass various options. Depending on the specified option, the parameters that follow can mean different things or might not be there at all.
The format of the shift command is as follows:
shift number
The parameter number is the number of places to be shifted and is optional. If not specified, the default is 1; that is, the parameters ...
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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.