05-15-2008
>&2 re-directs the output to file descriptor 2, which is called "Standard error", a channel used for outputting errors usually.
It's common unix practice.
10 More Discussions You Might Find Interesting
1. AIX
Hi all,
I am a newbe to aix 5.2. I want to specify the characters used by users while creating user in aix like specifying the length of the password
should i use some sript for that if it is then please let me know how to do this
if yes give me the link for the scripts.
Thanks in advance
... (2 Replies)
Discussion started by: Satya Mishra
2 Replies
2. UNIX for Dummies Questions & Answers
How can one limit the size of user mailboxes in /var/spool/mail? (0 Replies)
Discussion started by: proactiveaditya
0 Replies
3. Shell Programming and Scripting
I need to write what I thought would be a fairly simple 2-line UNIX script. It can be written PERL, csh, ksh...or whatever is easiest.
The entire script will be:
Begin Scipt
source MySourceFile
execute MyExecutable.exe
End Script
The problem is that MySourceFile can not be... (1 Reply)
Discussion started by: MMorrison
1 Replies
4. Shell Programming and Scripting
Hi Friends,
I am wrinting a shell script MorningChecks.sh which will call another script StartServer.sh. But the latter script requires user's inputs to complete. I want to automate this.
So can you please let me how this can be achieved?
Any help would be highly appereciated.
... (3 Replies)
Discussion started by: singh.chandan18
3 Replies
5. Emergency UNIX and Linux Support
Hi there,
I have a Debian 5.0 server that my company uses for deployment testing. This server needs to be accessed by NOC people that have no NIX knowledge whatsoever.
I am creating a bash script for a menu-based command interface for the commands they need to run on their testing routines,... (21 Replies)
Discussion started by: ppucci
21 Replies
6. Shell Programming and Scripting
I want a script that will prompt a user to enter 10 numbers and out put them into a file. This what I have so far, but isn't working. I'm guessing it's something easy I'm not seeing. Thanks for any help.
#!/usr/bin/ksh
echo "Enter 10 numbers"
for i in 1 2 3 4 5 6 7 8 9 10
do
read .... ... (8 Replies)
Discussion started by: AxlVanDamme
8 Replies
7. Shell Programming and Scripting
Hi,
Am trying to store the user inputs into a file, but the below code will store only the first line of the values. I need to store all the user input values which may contain one or more lines. Thanks in advance.
echo "please enter file names";
read name;
echo $name>/tmp/test (11 Replies)
Discussion started by: rogerben
11 Replies
8. Shell Programming and Scripting
Hi Everyone,
1) I really cannot figure out how to pass multiple user inputs in a script. really need your help re this. below is the script.
-----------
#!/bin/sh
# script name: ask.sh
echo "Enter name: \c"
read NAME
echo "Your name is $NAME\n"
echo "Enter age: \c"
read AGE
echo... (5 Replies)
Discussion started by: mcoblefias
5 Replies
9. Shell Programming and Scripting
Need a bash script that will ask the user: Which Files Would you like to copy?
Then the user would input the filenames (space seperated, all lowercase)
The script would then cp each file to /data/backup/ and also wc the files to std output. (to see how many lines each file has)
Should go... (5 Replies)
Discussion started by: ajp7701
5 Replies
10. UNIX for Beginners Questions & Answers
Hi,
I am new to bash scripting and i wanted to make a bash script that will generate a password for a user. The user must enter his/her name and the url of the site the password is used for. And the script will generate a password with those two elements in the password. So if the url is... (0 Replies)
Discussion started by: Kvr123
0 Replies
LEARN ABOUT CENTOS
tcl_setstdchannel
Tcl_GetStdChannel(3) Tcl Library Procedures Tcl_GetStdChannel(3)
__________________________________________________________________________________________________________________________________________________
NAME
Tcl_GetStdChannel, Tcl_SetStdChannel - procedures for retrieving and replacing the standard channels
SYNOPSIS
#include <tcl.h>
Tcl_Channel
Tcl_GetStdChannel(type)
Tcl_SetStdChannel(channel, type)
ARGUMENTS
int type (in) The identifier for the standard channel to retrieve or modify. Must be one of TCL_STDIN, TCL_STDOUT, or
TCL_STDERR.
Tcl_Channel channel (in) The channel to use as the new value for the specified standard channel.
_________________________________________________________________
DESCRIPTION
Tcl defines three special channels that are used by various I/O related commands if no other channels are specified. The standard input
channel has a channel name of stdin and is used by read and gets. The standard output channel is named stdout and is used by puts. The
standard error channel is named stderr and is used for reporting errors. In addition, the standard channels are inherited by any child
processes created using exec or open in the absence of any other redirections.
The standard channels are actually aliases for other normal channels. The current channel associated with a standard channel can be
retrieved by calling Tcl_GetStdChannel with one of TCL_STDIN, TCL_STDOUT, or TCL_STDERR as the type. The return value will be a valid
channel, or NULL.
A new channel can be set for the standard channel specified by type by calling Tcl_SetStdChannel with a new channel or NULL in the channel
argument. If the specified channel is closed by a later call to Tcl_Close, then the corresponding standard channel will automatically be
set to NULL.
If a non-NULL value for channel is passed to Tcl_SetStdChannel, then that same value should be passed to Tcl_RegisterChannel, like so:
Tcl_RegisterChannel(NULL, channel);
This is a workaround for a misfeature in Tcl_SetStdChannel that it fails to do some reference counting housekeeping. This misfeature can-
not be corrected without contradicting the assumptions of some existing code that calls Tcl_SetStdChannel.
If Tcl_GetStdChannel is called before Tcl_SetStdChannel, Tcl will construct a new channel to wrap the appropriate platform-specific stan-
dard file handle. If Tcl_SetStdChannel is called before Tcl_GetStdChannel, then the default channel will not be created.
If one of the standard channels is set to NULL, either by calling Tcl_SetStdChannel with a NULL channel argument, or by calling Tcl_Close
on the channel, then the next call to Tcl_CreateChannel will automatically set the standard channel with the newly created channel. If
more than one standard channel is NULL, then the standard channels will be assigned starting with standard input, followed by standard out-
put, with standard error being last.
See Tcl_StandardChannels for a general treatise about standard channels and the behaviour of the Tcl library with regard to them.
SEE ALSO
Tcl_Close(3), Tcl_CreateChannel(3), Tcl_Main(3), tclsh(1)
KEYWORDS
standard channel, standard input, standard output, standard error
Tcl 7.5 Tcl_GetStdChannel(3)