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Shell Programming and Scripting
read command
Post 302189606 by COD on Saturday 26th of April 2008 04:49:12 PM
04-26-2008
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1. Shell Programming and Scripting
'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!
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Hi all,
What does -u option indicates in read command.
while read -u var1
do
.
.
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hi all
iam not able use read command in the while loop in the following program
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Is there a way to use the READ command and force the user to enter a non-zero length string? If the user enters a zero length string the user input is rejected.
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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
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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:
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Hello guys,
I am trying to a script that reads from key board and use the entered value in the next step.
Example: enter folder name
read $folder (i will give work)
cd /main/$folder/
pwd
it should print /main/work
---------- Post updated at 03:31 PM ----------... (1 Reply)
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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(,).
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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??
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Trying to use the read command. How do you add a 2nd option? In this example I'd like to offer two options, pre and post. If you answer pre, you get one output but if you answer post, you get another output.
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LEARN ABOUT REDHAT
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. | 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. SEE ALSO
file(n), eof(n), fblocked(n), fconfigure(n) KEYWORDS
blocking, channel, end of line, end of file, nonblocking, read, translation, encoding Tcl 8.1 read(n)