read simply reads standard input. You probably want to use redirection.
Without concrete information about which particular string at which particular position, it's hard to do anything useful inside that loop, but it should hopefully be enough to get you started.
This is the greatest site ever, only my second day of use and the responses and advice I got from yesterdays question were great..
Now for todays question,
I have a file that I want to read one line at a time into a script i've written. Once I have read the line I would like to update it (in... (1 Reply)
i need to create a script that inputs information from another file using the read command. Sounds easy enough but i can't figure it out, can anyone help me? (2 Replies)
Hi,
Is there a way to have something working like the read Unix command to stop a awk ask a question and get the result.
I've try system("read a") but it does not work.
Thanks.
Franck. (6 Replies)
'Morning
vmstat 1 1|sed 1,2d|awk '{printf("%s\n",$1)}'|read var
echo $var
This syntax run on AIX (ksh) but not on linux (bash).
I think that problem is the read command, because the following syntax is ok :
vmstat 1 1|sed 1,2d|awk '{printf("%s\n",$1)}'
Could someone help me!
regards... (16 Replies)
Hi everyone,
I have problem while writing a shell script for linux (Red Hat).
First I need to create a read command. I tried to google this but so far I can't sort this out. I hope you will be able to help me.
I have to read a file like this :
GESTION_DATA_SET_variable1_variable2
... (2 Replies)
Hey, guys!
Trying to research this is such a pain since the read command itself is a common word. Try searching "unix OR linux read command examples" or using the command substitution keyword. :eek:
So, I wanted to use a command statement similar to the following.
This is kinda taken... (2 Replies)
Hello,
Below, I have a unix command, which can be executable for single file.
cat input.txt | sort -k3,3 > output.txt
I have 100 input files in a directory. It is hectic and time taking to run the above command for all the 100 files for 100 times.
Now, I want to execute the above unix... (2 Replies)
Tested on : bash
Will be implementing on : ksh
I dont know if this is weird , or my idea of Unix stdin or stdout is completely messed up , but if I use the following command, I am getting a proper output.
ls -l | head -1 | while read a ; do echo $a ;done
and the output is soemthing like... (5 Replies)
Hi,
I am facing issues with the below:
I have a lookup file say lookup.lkp.This lookup.lkp file contains strings delimited by comma(,).
Now i want to read this command from file and execute it.
So my code below is :
Contents in the lookup.lkp file is :
c_e,m,a,`cd $BOX | ls cef_*|tail... (7 Replies)
Is there a way to make the input of the read command (or some similar command that I'm unaware of) not visible, or with an astrix??
An example:
#!/bin/bash
# Example
echo; echo "Who are you??"; read name
if ;
then echo "Welcome, the terminal is yours."; exit
else "Stranger... (2 Replies)
Discussion started by: Huitzilopochtli
2 Replies
LEARN ABOUT CENTOS
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.
EXAMPLE
This example code reads a file all at once, and splits it into a list, with each line in the file corresponding to an element in the list:
set fl [open /proc/meminfo]
set data [read $fl]
close $fl
set lines [split $data
]
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)