06-03-2009
Command Output to Standard Input
Hi All,
How do I provide the output of a command to another command which is waiting for an input from the user ?
Ex : I need to login to a device via telnet. In the script, initially I use the "read" command to get the IP Address, Username and Password of the device from the user. Now, after issuing the telnet command in the script, I want to provide the username output read initially.
How would I do that ? Anyone help me out please.
Thank You.
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
I am sending a kill comand to kill a process inside a SH script but I don`t want the user to notice it so I don´t want the message "1222 killed" to appear.
I`ve tried to redirect the standard output to /dev/null 2>&1 and also tried to use "nohup" but none of them was succesfull.
Can anyone... (1 Reply)
Discussion started by: pguinal
1 Replies
2. Shell Programming and Scripting
This site has been very helpful thus far.. I thank you all in advance for sharing the knowledge. Let me get to it.
I am trying to write a very small script to take away from the boredom of doing the same thing over and over.
Everynow and again I have to get the hex value of a file using a... (2 Replies)
Discussion started by: BkontheShell718
2 Replies
3. Shell Programming and Scripting
Hi guys. Is it possible (I'm sure it is) to use the output of a simple 'ls' command as input of another command 'tail'.
It is not really the output of the 'ls'. I have to useeach line of the output.
This is the first command...
ls *myFile*021308*
Which it outputs many filenames. For each... (3 Replies)
Discussion started by: rodrimuino
3 Replies
4. UNIX for Dummies Questions & Answers
Hi,
I am triying to make sure that there exists only one file with the pattern abc* in path /path/. This directory is having many huge files. If there is only one file then I have to take its complete name only to use furter in my script.
I am planning to do like this:
if ; then... (2 Replies)
Discussion started by: new_learner
2 Replies
5. UNIX for Dummies Questions & Answers
Hi,
I want to check a particular word is in standard error output or not. Can I acheive it in single command?
For example,
Delete file_name 2>error.log
cat error.log
Output:
XXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXX
Successfully deleted
XXXXXXXXXXXXXXXXX
where delete is... (2 Replies)
Discussion started by: poova
2 Replies
6. UNIX for Dummies Questions & Answers
Hey, I'm completely new at this and I was wondering if there is a way that I would be able to redirect the log files in a directories standard output and standard error into and excel spreadsheet in anyway?
Please remember don't use too advanced of terminology as I just started using shell... (6 Replies)
Discussion started by: killaram
6 Replies
7. Shell Programming and Scripting
Hi all .... vexing problem here ...
I am using sed to replace some special characters in a .txt file:
sed -e 's/_<ED>_/_355_/g;s/_<F3>_/_363_/g;s/_<E1>_/_341_/g' filename.txt
This command replaces <ED> with í , <F3> with ó and <E1> with á.
When I run the command to standard output, it works... (1 Reply)
Discussion started by: crumplecrap
1 Replies
8. Red Hat
I ran the following command.
cat abc.c > abc.c
I got message the following message from command cat:
cat: abc.c : input file is same as the output file
How the command came to know of the destination file name as the command is sending output to standard file. (3 Replies)
Discussion started by: ravisingh
3 Replies
9. Shell Programming and Scripting
Hi All,
Hoping you can help as im in desperate need... I'm very new to unix scripting so apoligies,
I have setup an expect script in order to log into a node on our network, This will provide an output as per the below
*********** information:
*************: n/a
TEST IP : n/a
... (18 Replies)
Discussion started by: mutley2202
18 Replies
10. Homework & Coursework Questions
Just started learning Unix and received my first assignment recently. We haven't learned many commands and honestly, I'm stumped. I'd like to receive assistance/guidance/hints.
1. The problem statement, all variables and given/known data:
How do I write a shell script that takes in a file or... (4 Replies)
Discussion started by: fozilla
4 Replies
CON(1) General Commands Manual CON(1)
NAME
con, telnet, cu, rx, xms, xmr - remote login, execution, and XMODEM file transfer
SYNOPSIS
con [ -dCrvs ] [ -l [ remuser ] ] [ -c cmd ] [net!]machine
telnet [ -dCrn ] [net!]machine
cu number
rx [ -n ] [net!]machine [ command-word ... ]
xms file
xmr file
DESCRIPTION
Con connects to the computer whose network address is net!machine and logs in if possible. With no options, the account name used on the
remote system is the same as that on the local system. Standard input and output go to the local machine.
Options are:
-l with an argument causes remuser to be used as the account name on the remote system. Without an argument this option disables auto-
matic login and a normal login session ensues.
-C forces cooked mode, that is, local echo.
-c runs cmd as if it had been typed as a command from the escape mode. This is used by cu.
-v (verbose mode) causes information about connection attempts to be output to standard error. This can be useful when trying to debug
network connectivity.
-d causes debugging information to be output to standard error.
-r suppresses printing of any carriage return followed by a new line. This is useful since carriage return is a printable character in
Plan 9.
-s strips received characters to 7 bits to forestall misinterpretation of ASCII with parity as UTF.
The control- character is a local escape. It prompts with the local machine name and >>>. Legitimate responses to the prompt are
i Send a quit [sic] signal to the remote machine.
q Exit.
b Send a break.
. Return from the escape.
!cmd Run the command with the network connection as its standard input and standard output. Standard error will go to the screen. This
is useful for transmitting and receiving files over the connections using programs such as xms.
Telnet is similar to con, but uses the telnet protocol to communicate with the remote machine. If standard input is a file or a pipe, the
-n option causes telnet not to hang up the connection when it receives EOF on its standard input; instead it waits for the remote end to
hang up. It shares con's -C, -d, and -r options.
Cu is a shell script that uses telco(4) and con to connect to a machine via a modem. If the machine is equipped with a local modem, it is
used. Otherwise, the call is placed through Datakit.
Rx executes one shell command on the remote machine as if logged in there, but with local standard input and output. A rudimentary shell
environment is provided. If the target is a Plan 9 machine, $service there will be rx.
Network addresses for both con and rx have the form network!machine. Supported networks are those listed in /net.
The commands xms and xmr respectively send and receive a single file using the XMODEM protocol. They use standard input and standard out-
put for communication and are intended for use with con.
EXAMPLES
rx kremvax cat file1 >file2
Copy remote file1 to local file2.
rx kremvax cat file1 '>file2'
Copy remote file1 to remote file2.
eqn paper | rx kremvax troff -ms | rx deepthought lp
Parallel processing: do each stage of a pipeline on a different machine.
SOURCE
/sys/src/cmd/con
for con, xms, and xmr.
/sys/src/cmd/ip
for telnet.
/rc/bin/cu
BUGS
Under rx, a program that should behave specially towards terminals may not: e.g., remote shells will not prompt. Also under rx, the remote
standard error and standard output are combined and go inseparably to the local standard output.
CON(1)