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Full Discussion: Weird: unexpected result after piping a sort
Top Forums UNIX for Dummies Questions & Answers Weird: unexpected result after piping a sort Post 302762513 by Perderabo on Monday 28th of January 2013 03:10:38 PM
Old 01-28-2013
Code:
$ rm * ; touch a b c ; bash -c "ls | sort > out" ; cat out
a
b
c
$ rm * ; touch a b c ; bash -c "ls | sort > out" ; cat out
a
b
c
$ rm * ; touch a b c ; bash -c "ls | sort > out" ; cat out
a
b
c
out
$

Sometimes I get it. Sometimes I don't. To implement the pipeline, the shell has two processes, one for ls and one for sort. There is no guarantee that the ls process will complete the directory read before the sort process opens its output file. It's a race condition that results in variable results. put the output file in another directory.

If you don't get variable results, try other shells or other platforms with more cpu's available. Or vary the other workload that the system is running while it runs your pipeline.

Anyway, ls sorts its output by itself.
This User Gave Thanks to Perderabo For This Post:
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LEARN ABOUT CENTOS

ttytype

TTYTYPE(5)						     Linux Programmer's Manual							TTYTYPE(5)

NAME

       ttytype - terminal device to default terminal type mapping

DESCRIPTION

       The  /etc/ttytype  file	associates termcap(5)/terminfo(5) terminal type names with tty lines.  Each line consists of a terminal type, fol-
       lowed by whitespace, followed by a tty name (a device name without the /dev/) prefix.

       This association is used by the program tset(1) to set the environment variable TERM to the default terminal name for  the  user's  current
       tty.

       This  facility was designed for a traditional time-sharing environment featuring character-cell terminals hardwired to a UNIX minicomputer.
       It is little used on modern workstation and personal UNIX systems.

FILES

       /etc/ttytype
	      the tty definitions file.

EXAMPLE

       A typical /etc/ttytype is:

	      con80x25 tty1
	      vt320 ttys0

SEE ALSO

       termcap(5), terminfo(5), agetty(8), mingetty(8)

COLOPHON

       This page is part of release 3.53 of the Linux man-pages project.  A description of the project, and information about reporting bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

Linux								    2012-12-31								TTYTYPE(5)
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