As Alex notes below - what you probably meant was "|"
--- Begin Message ---
- Subject: Re: Pipe Commands
- From: Alex <alex.tsr@xxxxxxxxx>
- Date: Tue, 09 Sep 2008 16:30:38 +0300
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On Tue, 2008-09-09 at 14:21 +0100, Kae Verens wrote: > Gopal Ghosh wrote: > > Dear All, > > my self gopal ghosh a newbie in Linux world. found myself in love with > > Linux as i came to know the power of Linux CLI > > > > if two different commands are separated by || (a method by which two > > comands can be executed one after another ) > > such as > > ls || nano > > > > the above command executes both the command with out stops after > > executing the first one. > > > > the book says that it will stop executing further after the first command > > but it is not the same which i observed > > pls help > > '||' means 'or'. In a list of commands separated by '||', each of the commands are run until one of them succeeds. > > as an example: > echo 1 || echo 2 > > this echoes '1' to the screen, but '2' is /not/ echoed. > > in your command, 'nano' should only run if 'ls' fails. > > for example, as a normal user, run this: > ls /root || nano > > in that case, nano will run, but in this, it won't: > ls ~ || nano > > I hope that helps! > > kae and since the email is titled "Pipe Commands" I guess what you really want is '|' which will take the output from the first command and feed it to the second, in other words pipe it. Cheers, Alex.
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