June 2004
Intermediate to advanced
1056 pages
39h 58m
English
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Name
apply
Synopsis
apply [options]command arguments
Allows you to run a given command multiple times, each time with a
different argument. By default, apply pairs and
runs command followed by each argument
listed in arguments. To place the argument
elsewhere in command, mark that location
in command with
%
n, where
n is the nth
unused item listed in arguments (see
examples).
Options
-
-acharacter Use
characterinstead of%.-
-number Instead of pairing arguments one at a time with
command, use themnumberat a time withcommand. Ifnumberis 0, none of the arguments will be used withcommand, butcommandwill still run once for each item listed inarguments. Ifcommandcontains%n,numberis ignored.
Examples
Ping three different hosts, sending three packets to each:
$ apply 'ping -c3' host1.com host2.com host3.comPing three different hosts, sending a different number of packets to each:
$ apply -2 'ping -c' 3 host1.com 4 host2.com 5 host3.comPing three different hosts, and write output to file
pinglog:
$apply 'ping -c3 %1 >> pinglog' host1.com host2. com⊘host3.com
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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.