Hi, try this site for lots of tips an tricks http://www.linux.com/tuneup [Avishay Aton] > -----Original Message----- > From: Shaul Karl [SMTP:[EMAIL PROTECTED]] > Sent: Sunday, October 22, 2000 1:36 AM > To: [EMAIL PROTECTED] > Subject: Re: Cool shell tricks (was: Re: file system questions) > > > On Sat, Oct 21, 2000 at 08:23:44AM +0200, Shaul Karl wrote: > > > > Also, seems that not many people are aware of "process substitution" > > > > in bash: you do something like "diff <(ls dir1) <(ls dir2)", and > bash > > > > runs two ls's, each writing to a FIFO, and diff gets the names of > > > > these two FIFOs as parameters. Output redirection also works. I'm > not > > > > sure how portable it is, though. > > > > > > 1. > > > [08:05:37 /tmp]$ diff < (ls ~/setiathome/) <(ls ~/setiathome/amos/) > > > bash: syntax error near unexpected token `(l' > > > [08:06:04 /tmp]$ > > > > > > Ache, the space there is significant: > > > > > > [08:17:12 /tmp]$ diff <(ls ~/setiathome/) <(ls ~/setiathome/amos/) > > > > Yeah... Otherwise it's redirection. > > > > > > > I am confused. Without the space it is not a redirection? Is there a > difference between a FIFO and a redirection? > > > > > > > > 2. > > > This will only work if the "main" process (diff in this example) does > not need > > > to seek the input since it can not do it with a FIFO. Or am I missing > > > something? > > > > True... You can't. It would've been nice if Bash had the option to use > > temporary files rather than FIFOs... But I don't know if it's needed > > that often. > > > > Just tried: both nvi and vim cope fine, Emacs refuses to read it (at > > least with default setup and switches). Less requires you to use -f. > > > > > > - Adi Stav > > > > ================================================================= > > To unsubscribe, send mail to [EMAIL PROTECTED] with > > the word "unsubscribe" in the message body, e.g., run the command > > echo unsubscribe | mail [EMAIL PROTECTED] > > > > -- > > Shaul Karl <[EMAIL PROTECTED]> > > > > ================================================================= > To unsubscribe, send mail to [EMAIL PROTECTED] with > the word "unsubscribe" in the message body, e.g., run the command > echo unsubscribe | mail [EMAIL PROTECTED] ================================================================= To unsubscribe, send mail to [EMAIL PROTECTED] with the word "unsubscribe" in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
