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Full Discussion: unix file size becomes zero
Special Forums Hardware Filesystems, Disks and Memory unix file size becomes zero Post 302091298 by hegemaro on Sunday 1st of October 2006 11:12:27 AM
Old 10-01-2006
I don't see how that command could have wiped the ps binary as there is no redirection to a file, only a pipeline into another command. A useful trick in ksh is to set the noclobber option which prevents accidental overwrite of existing files -- even for root.

# set -o noclobber
# /usr/ucb/ps -auxww 3589 > out
# /usr/ucb/ps -auxww 3589 > out
ksh: out: file already exists

Use the >| syntax for force an overwrite:
# /usr/ucb/ps -auxww 3589 >| out
 

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LEARN ABOUT OPENSOLARIS

hp7221plot

plot(1B)					     SunOS/BSD Compatibility Package Commands						  plot(1B)

NAME

       plot,  aedplot,	atoplot,  bgplot, crtplot, dumbplot, gigiplot, hpplot, implot, plottoa, t300, t300s, t4013, t450, tek, vplot, hp7221plot -
       graphics filters for various plotters

SYNOPSIS

       /usr/ucb/plot [-Tterminal]

DESCRIPTION

       The plot utility reads plotting instructions (see plot(4B)) from the standard input and produces plotting instructions suitable for a  par-
       ticular terminal on the standard output.

       If no terminal is specified, the environment variable TERM is used.  The default terminal is tek.

ENVIRONMENT VARIABLES

       Except for ver, the following terminal-types can be used with `lpr -g' (see lpr(1B)) to produce plotted output:

       2648 | 2648a |  h8 |  hp2648 |  hp2648a

	   Hewlett Packard 2648 graphics terminal.

       hp7221 | hp7 |  h7 |

	   Hewlett Packard 7221 plotter.

       300

	   DASI 300 or GSI terminal (Diablo mechanism).

       300s | 300S

	   DASI 300s terminal (Diablo mechanism).

       450

	   DASI Hyterm 450 terminal (Diablo mechanism).

       4013

	   Tektronix 4013 storage scope.

       4014 | tek

	   Tektronix 4014 and 4015 storage scope with Enhanced Graphics Module. (Use 4013 for Tektronix 4014 or 4015 without the Enhanced Graphics
	   Module).

       aed

	   AED 512 color graphics terminal.

       bgplot | bitgraph

	   BBN bitgraph graphics terminal.

       crt

	   Any crt terminal capable of running vi(1).

       dumb | un |  unknown

	   Dumb terminals without cursor addressing or line printers.

       gigi | vt125

	   DEC vt125 terminal.

       implot

	   Imagen plotter.

       var

	   Benson Varian printer-plotter

       ver

	   Versatec D1200A printer-plotter. The output is scan-converted and suitable input to `lpr -v'.

FILES

       /usr/ucb/aedplot

       /usr/ucb/atoplot

       /usr/ucb/bgplot

       /usr/ucb/crtplot

       /usr/ucb/dumbplot

       /usr/ucb/gigiplot

       /usr/ucb/hp7221plot

       /usr/ucb/hpplot

       /usr/ucb/implot

       /usr/ucb/plot

       /usr/ucb/plottoa

       /usr/ucb/t300

       /usr/ucb/t300s

       /usr/ucb/t4013

       /usr/ucb/t450

       /usr/ucb/tek

       /usr/ucb/vplot

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWscpu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       graph(1), tplot(1), vi(1), lpr(1B), plot(4B), attributes(5)

SunOS 5.11							    3 Aug 1994								  plot(1B)
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