Sponsored Content
Top Forums Shell Programming and Scripting Simply question about capturing output to /dev/tty Post 302832833 by Chubler_XL on Monday 15th of July 2013 10:03:18 PM
Old 07-15-2013
You could use script:

Code:
script -q ksh -c 'echo $RANDOM > /dev/tty' > random_value
cat random_value

or gnuscreen:
Code:
screen -dmS getlicense ksh
screen -p 0 -S getlicense -X log on
screen -p 0 -S getlicense -X stuff 'echo \$RANDOM > /dev/tty\n'
sleep 1
screen -p 0 -S getlicense -X log off
screen -p 0 -S getlicense -X quit
cat screenlog.0


Last edited by Chubler_XL; 07-15-2013 at 11:08 PM..
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Cannot open "/dev/tty"

Hi, When it proccesing the backup with cpio report this message: Cannot open "/dev/tty" and cancel de backup. Cuando se procesa la tarea del backup reporta el error: Cannot open "/dev/tty" y cancela el backup y no termina correctamente, a que se devera esta advertencia. Gracias. Thacks.... (3 Replies)
Discussion started by: cmr88
3 Replies

2. Solaris

What is /dev/tty /dev/null and /dev/console

Hi, Anyone can help My solaris 8 system has the following /dev/null , /dev/tty and /dev/console All permission are lrwxrwxrwx Can this be change to a non-world write ?? any impact ?? (12 Replies)
Discussion started by: civic2005
12 Replies

3. Programming

sniff /dev/tty

hello all, Being root, I would like to log user activity (also multiple root activity), i don't really like history file based logging, lets assume that users have access to their .profile. I would like to write a monitoring daemon in C that would capture /dev/ttys, so I need to do a... (0 Replies)
Discussion started by: wayward
0 Replies

4. UNIX for Dummies Questions & Answers

Help Understanding Output and question about /dev/

Hi, I am having some problems understanding the info from the following output: Disk /dev/sda: 17849 cylinders, 255 heads, 63 sectors/track Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0 Device Boot Start End #cyls #blocks Id System /dev/sda1 *... (5 Replies)
Discussion started by: mojoman
5 Replies

5. Programming

What happens on opening /dev/tty failure?

Since the existence of /dev/tty is not guaranteed, what happens when an attempt is made to open /dev/tty and there's no controlling terminal? Will it fail, or open /dev/null instead? Or do something else? So is checking for NULL in the code below a safe way of checking whether opening... (2 Replies)
Discussion started by: gencon
2 Replies

6. UNIX for Dummies Questions & Answers

read from terminal/keyboard > /dev/tty

Hi, I need to provide more than one character to "> /dev/tty" through terminal/keyboard input, I have this: ok=false while do echo " Enter r1 to reformat " > /dev/tty read choice case $choice in ) echo " bla bla bla " ;; done However, in this way,... (3 Replies)
Discussion started by: Gery
3 Replies

7. Programming

Create a pipe to /dev/tty

Hello everybody: I have a child process which reads a password from /dev/tty, as far as I know file descriptors for the child process can be seen by using lsof, so I want to connect to such device in order to send the password through a pipe, how could I do that? (2 Replies)
Discussion started by: edgarvm
2 Replies

8. UNIX for Dummies Questions & Answers

/dev/tty find last modified time

what can I use to find the last modified time of a /dev/tty ? (4 Replies)
Discussion started by: l flipboi l
4 Replies

9. UNIX for Dummies Questions & Answers

Reading password from /dev/tty

hi, From the below script: ##########################################pwd_auth.sh######################################################################################## #Author: Pandeeswaran Bhoopathy #Written on:26th Jan 2012 2:00PM #This script describes the feature of stty and illustrates... (3 Replies)
Discussion started by: pandeesh
3 Replies

10. Emergency UNIX and Linux Support

Capturing console (/dev/ttyS1) logs

Hi, I have been trying to capture console logs from the init script. When the ramfs is mounted, i check if usb is connected , if conncted, i mount it and redirected the console logs like so: cat & /dev/ttyS1 >> /mnt/logs.txt I'm getting /bin/sh : /dev/ttyS1 :permission denied ... (8 Replies)
Discussion started by: xerox
8 Replies
BlackPixelOfScreen(3X11)					     MIT X11R4						  BlackPixelOfScreen(3X11)

Name
       BlackPixelOfScreen, WhitePixelOfScreen, CellsOfScreen, DefaultColormapOfScreen, DefaultDepthOfScreen, DefaultGCOfScreen, DefaultVisualOf-
       Screen, DoesBackingStore, DoesSaveUnders, DisplayOfScreen, XScreenNumberOfScreen, EventMaskOfScreen, HeightOfScreen, HeightMMOfScreen, Max-
       CmapsOfScreen, MinCmapsOfScreen, PlanesOfScreen, RootWindowOfScreen, WidthOfScreen, WidthMMOfScreen - screen information functions and
       macros

Syntax
       BlackPixelOfScreen(screen)

       WhitePixelOfScreen(screen)

       CellsOfScreen(screen)

       DefaultColormapOfScreen(screen)

       DefaultDepthOfScreen(screen)

       DefaultGCOfScreen(screen)

       DefaultVisualOfScreen(screen)

       DoesBackingStore(screen)

       DoesSaveUnders(screen)

       DisplayOfScreen(screen)

       int XScreenNumberOfScreen(screen)
	  Screen *screen;

       EventMaskOfScreen(screen)

       HeightOfScreen(screen)

       HeightMMOfScreen(screen)

       MaxCmapsOfScreen(screen)

       MinCmapsOfScreen(screen)

       PlanesOfScreen(screen)

       RootWindowOfScreen(screen)

       WidthOfScreen(screen)

       WidthMMOfScreen(screen)

Arguments
       screen	 Specifies a pointer to the appropriate structure.

Description
       The macro returns the black pixel value of the specified screen.

       The macro returns the white pixel value of the specified screen.

       The macro returns the number of colormap cells in the default colormap of the specified screen.

       The macro returns the default colormap of the specified screen.

       The macro returns the default depth of the root window of the specified screen.

       The macro returns the default GC of the specified screen, which has the same depth as the root window of the screen.

       The macro returns the default visual of the specified screen.

       The macro returns or which indicate whether the screen supports backing stores.

       The macro returns a Boolean value indicating whether the screen supports save unders.

       The macro returns the display of the specified screen.

       The function returns the screen index number of the specified screen.

       The macro returns the root event mask of the root window for the specified screen at connection setup.

       The macro returns the height of the specified screen.

       The macro returns the height of the specified screen in millimeters.

       The macro returns the maximum number of installed colormaps supported by the specified screen.

       The macro returns the minimum number of installed colormaps supported by the specified screen.

       The macro returns the number of planes in the root window of the specified screen.

       The macro returns the root window of the specified screen.

       The macro returns the width of the specified screen.

       The macro returns the width of the specified screen in millimeters.

See Also
       AllPlanes(3X11), ImageByteOrder(3X11), IsCursorKey(3X11)
       X Window System: The Complete Reference, Second Edition, Robert W. Scheifler and James Gettys

															  BlackPixelOfScreen(3X11)
All times are GMT -4. The time now is 02:08 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy