First off, I'd like to warn you: using backticks is a very, very, bad idea: they are outdated, they have a lot of drawbacks, they are only supported for backwards compatibility purposes (with some scripts from the seventies) and you should forget that they exist. Instead of
use
which does the same, only much better.
Quote:
Originally Posted by colinireland
reading in output from a terminal to a variable in the bash script.
terminals don't have output - only processes have output. If you start a process you can redirect its output to <stdout> and/or <stderr> (to your terminal, a file or the device another file descriptor points to). There is no way to redirect the output of a process you don't have started.
If you want to start an xterm and display the output of some process there, you have to:
1. create the terminal window
2. find out the device file attached to it
3. start your process and redirect its output to the device file in question.
More details: Unicode, Framebuffer. I tried to press Esc and then what should follow, letters or brackets, but seems not to work. Probably i do something wrong. If somebody is familiar with escape sequences in the console, how do you do that?
Thanks in advance. (4 Replies)
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)
I have a script.
#! /bin/bash
echo "Enter a word: "
read word
echo $word
That outputs like this..
Enter a word:
hello
hello
But how can i read on the same line the question is printed?
Like this..
Enter a word: hello
hello (2 Replies)
Hi
I am new to writing script and want to use a Bash Piped while-read and read from user input.
if something happens on server.log then do while loop or if something happend on user input then do while loop.
Pseudocode something like:
tail -n 3 -f server.log | while read serverline || read... (8 Replies)
My script needs to get some input from the user and go as a background process and run.
I have something like
read input.
do
while ...
if
..
fi
done
can i use nohup inside the script?? (7 Replies)
I'm a beginner to the Linux programming and trying my hands on some device driver examples while practising. The below code (a trimmed down version of tiny_tty.c from ldd3 book) loads perfectly using insmod and I'm able to see it in /proc/tty/drivers , /proc/modules and device nodes are getting... (1 Reply)
Dear Friends,
I am looking for a shell script to merge input files into one file .. here is my idea:
1st paramter would be outfile file (all input files content)
read all input files and merge them to input param 1
ex: if I pass 6 file names to the script then 1st file name as output file... (4 Replies)
Hi,
I'm using read in a script to prompt and receive input.
read -r -p "Do you also want to deploy folder? " response
This works fine, however, if I remotely execute the same script via ssh, at this point in the code, I don't see the message at all, but it waits for input. I could echo... (1 Reply)
Hi,
I am working on a script, which requests users to enter input.
Ex: read -p "Please enter your email id:" email
I don't want users skipping this entry, this has to be mandatory.I dont want to proceed without input.
I can do a check if variable $email is empty and proceed if not.But, i... (7 Replies)
In bash, you can do something like this:
#!/bin/bash
echo -n "What is your name? " > /dev/tty
read thename < /dev/tty
How can I do the same in python?
I have a python script that has the following content:
#!/usr/bin/python2.7
import getpass
import sys
import telnetlib
import... (2 Replies)
Discussion started by: SkySmart
2 Replies
LEARN ABOUT FREEBSD
watch
WATCH(8) BSD System Manager's Manual WATCH(8)NAME
watch -- snoop on another tty line
SYNOPSIS
watch [-cinotW] [-f snpdev] [tty]
DESCRIPTION
The watch utility allows the user to examine all data coming through a specified tty using the snp(4) device. If the snp(4) device is not
available, watch will attempt to load the module (snp). The watch utility writes to standard output.
The options are as follows:
-c Reconnect on close. If the tty observed by watch is closed, automatically reattach to the same tty. If this option is not speci-
fied, watch will request a new tty if running in interactive mode or exit if running without a controlling tty.
-f snpdev
If this option is specified, watch will use snpdev as the snp(4) device. Without this option, watch will attempt to find the next
available snp(4) device.
-i Force interactive mode. Interactive mode is a default if watch is started from a tty. If output is redirected to a file, interac-
tive mode can still be requested by specifying this option.
-n Disable the ability to switch the watched tty interactively. This disables both change requests made with <control-X> as well as
automatic prompting when the current tty is closed or overflows. In all cases where a prompt would be displayed, watch will exit.
The reconnect flags are unaffected by this option. When this flag is used, <control-X> is passed through to the terminal.
-o Reconnect on overflow. The behavior of watch if the observed tty overflows is similar to the behavior if the observed tty is closed.
For more info see snp(4).
-t Print the date and time when observation of a given tty is started.
-W Allow write access to observed tty.
tty Tty may be specified as a tty-style device, such as a pseudo tty device, a virtual console, or a serial line, etc. Names may be pre-
ceded by /dev/.
OPERATION
While running in interactive mode, all user input is discarded except for:
<control-G>
Exit watch.
<control-W>
Clear screen.
<control-X>
Change attached tty, unless this feature is disabled, in which case control-X is passed to the terminal as with other control charac-
ters.
SEE ALSO pty(4), sio(4), snp(4), kldload(8)HISTORY
The watch utility first appeared in FreeBSD 2.1.
AUTHORS
Ugen J.S. Antsilevich <ugen@NetVision.net.il>
BUGS
No terminal emulation is performed. All user output is reproduced as-is.
BSD November 24, 2001 BSD