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Full Discussion: Exec command - different output
Operating Systems Solaris Exec command - different output Post 303000615 by bakunin on Saturday 15th of July 2017 06:29:37 PM
Old 07-15-2017
Quote:
Originally Posted by s_premkumar
Its resulting the below output.
Code:
prem@host1:exec pause 2>> /tmp/prem.log
Please Press  to continue
Connection to host1 closed.
prem@host1:
prem@host2:exec pause 2>> /tmp/prem.log
Please Press  to continue
Connection to host2 closed.
prem@host2:

. When I execute the command in host1 its not waiting for input. Any idea friends?
I can't tell you why it isn't waiting on host1, but i suppose it is simply not there (or not in the path, not flagged executable, ....). I can tell you, though, why your connection to the host is closed afterwards:

Normally, when you start a process B from another process A , A sets up B as its "child process": B will be started, executed and when it ends, its return value will be presented to A for evaluation.


With the command exec this changes: A, in fact, will start B in its own environment (the one of A) and the exit immediately so that B effectively replaces A. Because you replaces your login shell with the little script you wrote (which in turn ended) your connection was simply closed the same way it would have been if you had ended the login shell otherwise (like by pressing "CTRL-D", entering "exit", etc.).

I hope this helps.
bakunin
This User Gave Thanks to bakunin For This Post:
jim mcnamara
 

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LEARN ABOUT OPENSOLARIS

ppmtosixel

ppmtosixel(1)                                                 General Commands Manual                                                ppmtosixel(1)

NAME

       ppmtosixel - convert a portable pixmap into DEC sixel format

SYNOPSIS

       ppmtosixel [-raw] [-margin] [ppmfile]

DESCRIPTION

       Reads  a  portable  pixmap  as input.  Produces sixel commands (SIX) as output.  The output is formatted for color printing, e.g. for a DEC
       LJ250 color inkjet printer.

       If RGB values from the PPM file do not have maxval=100, the RGB values are rescaled.  A printer control header and a color assignment table
       begin the SIX file.  Image data is written in a compressed format by default.  A printer control footer ends the image file.

OPTIONS

       -raw   If  specified,  each  pixel  will  be explicitly described in the image file.  If -raw is not specified, output will default to com-
              pressed format in which identical adjacent pixels are replaced by "repeat pixel" commands.  A raw file is often an order  of  magni-
              tude larger than a compressed file and prints much slower.

       -margin
              If  -margin  is not specified, the image will be start at the left margin (of the window, paper, or whatever).  If -margin is speci-
              fied, a 1.5 inch left margin will offset the image.

PRINTING

       Generally, sixel files must reach the printer unfiltered.  Use the lpr -x option or cat filename > /dev/tty0?.

BUGS

       Upon rescaling, truncation of the least significant bits of RGB values may result in poor color conversion.  If the original PPM maxval was
       greater  than  100,  rescaling  also reduces the image depth.  While the actual RGB values from the ppm file are more or less retained, the
       color palette of the LJ250 may not match the colors on your screen.  This seems to be a printer limitation.

SEE ALSO

       ppm(5)

AUTHOR

       Copyright (C) 1991 by Rick Vinci.

                                                                   26 April 1991                                                     ppmtosixel(1)
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