The symptom "while read loop stops after one cycle" is typical for a conmand that reads from stdin, sucking from the input that is for the read command.
Maybe HandBrakeCLI is such a command? Then it helps to redirect its input
or
These 2 Users Gave Thanks to MadeInGermany For This Post:
I'm new to Unix. I'm just looking for really good unix documents through Internet as pdf format on programming in all shells, and system adminstrator documents, and well as just all around really good documents on unix.
Thank you (5 Replies)
hello everyone, i am still trying to get this script to work, but with no luck. It is a little beyond my knowledge of scripting at the moment. The beginner book i have has an exercise listed that asks me to write a script tha allows for user input.
For example " what is your name: " and then you... (3 Replies)
I was wondering if someone could tell me where I could learn everything about Unix/Linux
and I was also wondering what the differance between Unix and Linux was :confused:
Ive never used it, never seen it.. But Im interested in learning :D (3 Replies)
I have this command line entry that I would like to turn into a script. I want to be able to just run the script with options for the report name and switch. Can anyone help me get started? I am hoping that by creating this script it will help me be able to create more.
I have never written one. I... (11 Replies)
I have just installed Ubuntu because I need a linux system asap and Ubuntu seems to be easiest for that. But I plan on installing some other Linux distro's for a while (maybe on virtualBox too) so i can understand the inner workings of linux and especially more about unix. I know that alot of the... (11 Replies)
Hi friends,
I hope everybody is fine. I have been studing operating system concepts at college, and I find this subject very interesting. I've decided that I must go into this field no matter what, hopefully someday I would design my own operating system. I have two choices infront of me, studying... (9 Replies)
hi guys,
i got job recently in a company which provide a product for data backup and data recovery... as dis product is wrriten in c++ am workin in c++.. now am under training and i want to learn abt Operating System concepts and OS programming using c and c++. i know basic c and c++ programming... (0 Replies)
I am working on learning Linux, and somebody suggested setting up Linux on a separate computer, and searching for answers to whatever may be needed, on a different computer plugged in to the Internet.
I have a Windows 7 PC, plugged in to a cable modem, and an old notebook, Compaq Presario R3000... (5 Replies)
Hi there,
im just having a hard time understanding why this code does not print anything that is suppose to print:
score = raw_input ('what is your score? \n')
try:
if 1.0 == float(score) >= 0.9:
print "A"
elif 0.9 > float(score) >= 0.8:
... (1 Reply)
Discussion started by: la2015
1 Replies
LEARN ABOUT OPENDARWIN
read
read(n) Tcl Built-In Commands read(n)
__________________________________________________________________________________________________________________________________________________NAME
read - Read from a channel
SYNOPSIS
read ?-nonewline? channelId
read channelId numChars
_________________________________________________________________DESCRIPTION
In the first form, the read command reads all of the data from channelId up to the end of the file. If the -nonewline switch is specified
then the last character of the file is discarded if it is a newline. In the second form, the extra argument specifies how many characters
to read. Exactly that many characters will be read and returned, unless there are fewer than numChars left in the file; in this case all
the remaining characters are returned. If the channel is configured to use a multi-byte encoding, then the number of characters read may
not be the same as the number of bytes read.
ChannelId must be an identifier for an open channel such as the Tcl standard input channel (stdin), the return value from an invocation of |
open or socket, or the result of a channel creation command provided by a Tcl extension. The channel must have been opened for input.
If channelId is in nonblocking mode, the command may not read as many characters as requested: once all available input has been read, the
command will return the data that is available rather than blocking for more input. If the channel is configured to use a multi-byte
encoding, then there may actually be some bytes remaining in the internal buffers that do not form a complete character. These bytes will
not be returned until a complete character is available or end-of-file is reached. The -nonewline switch is ignored if the command returns
before reaching the end of the file.
Read translates end-of-line sequences in the input into newline characters according to the -translation option for the channel. See the
fconfigure manual entry for a discussion on ways in which fconfigure will alter input.
USE WITH SERIAL PORTS
For most applications a channel connected to a serial port should be configured to be nonblocking: fconfigure channelId -blocking 0. Then
read behaves much like described above. Care must be taken when using read on blocking serial ports:
read channelId numChars
In this form read blocks until numChars have been received from the serial port.
read channelId
In this form read blocks until the reception of the end-of-file character, see fconfigure -eofchar. If there no end-of-file charac-
ter has been configured for the channel, then read will block forever.
SEE ALSO
file(n), eof(n), fblocked(n), fconfigure(n), Tcl_StandardChannels(3)KEYWORDS
blocking, channel, end of line, end of file, nonblocking, read, translation, encoding
Tcl 8.1 read(n)