For one thing, you're not reading anything, how can you even tell if the device answers? It might be waiting for data to get read from it before it'll do anything else.
For another thing, maybe it needs carriage returns, which UNIX usually doesn't provide or use. You can force echo to produce them of course...
It'd be good to know if the serial device is producing any response at all, working or not... Does it print anything when you type in the AT command in PuTTY? I'd start with that, just get that working, and add other bits once I know I have that.
Last edited by Corona688; 09-18-2009 at 07:05 PM..
I'm trying to unmount a file system, but umount says the device is busy. A fuser -c /myfs tells me that nothing on this fs is in use. Any idea?
Oh, and btw, why isn't my signature beeing displayed? Show user's signature is enabled and I have entered one :/ (10 Replies)
Anyone have any idea why I cannot umount a directory even though fuser shows no process attached to it?
fuser -cu /data/oracle/GMPSHRDM/export
/data/oracle/GMPSHRDM/export:
umount /data/oracle/GMPSHRDM/export
umount: cannot unmount /data/oracle/GMPSHRDM/export : Device busy
umount:... (2 Replies)
Hi,
I'm trying to do a sharity mount to mount a terastation network drive.
I'm getting a Device or resource busy message after my mount command. Please see output below...
# /usr/local/sharity3/bin/sharity mount smb://labbackup01/bakup_data /mnt/labbackup01
Device or resource busy.... (2 Replies)
Ciao a tutti!!!
il mio problema è questo: sto cercando di inviare dei comandi AT da PC a cellulare utilizzando il bluetooth e cygwin e vorrei visualizzare le risposte nella shell bash. Per farlo apro due terminali utilizzando le seguente istruzioni:
xterm &
Sul primo scrivo
cat /dev/ttyS2
... (0 Replies)
Ciao a tutti!!!
il mio problema è questo: sto cercando di inviare dei comandi AT da PC a cellulare utilizzando il bluetooth e cygwin e vorrei visualizzare le risposte nella shell bash. Per farlo apro due terminali utilizzando le seguente istruzioni:
xterm &
Sul primo scrivo
cat /dev/ttyS2
... (1 Reply)
hello to everybody
I have Ubuntu Lucid 10.04 installed on my Desktop and I have a PCI serial card in my computer and it has only one serial port.
Actually I want to use this serial port for the serial communication and for that I executed this command :
$ setserial -g /dev/ttyS
and I... (0 Replies)
Hi Everyone,
I am trying to remove a directory:
$ rm -rf directory_name/
rm: cannot remove `directory_name/filename': Device or resource busy
What does this mean, and why can't I remove these files? I already tried moving into the directory, and removing the files individually, but I... (7 Replies)
Is there a trick to mounting swap in n a lvm? I can't get it to work.
# swapon -va
swapon on /dev/mapper/VG-lv_swap
swapon: /dev/mapper/VG-lv_swap: found swap signature: version 1, page-size 4, same byte order
swapon: /dev/mapper/VG-lv_swap: pagesize=4096, swapsize=4294967296,... (1 Reply)
Hi there
After making a backup copy of it sometimes happens that when I want to unmount an NFS indicates the error:umount: /path_mount busy: Device busy (Error 16)
if I run lsoff, I can not find the process that is blocking the application.
I'm using OpenServer 5.0.2c as one NFS server ... (14 Replies)
Hi,
Unable to make tape backup, please help.
/opt/ignite/bin/make_tape_recovery -a /dev/rmt/?mn -I -v -m tar -x inc_entire=vg00
* Creating local directories for configuration files and archive.
======= 04/25/16 16:28:08 IST Started /opt/ignite/bin/make_tape_recovery.
(Mon... (4 Replies)
Discussion started by: anuragr
4 Replies
LEARN ABOUT PHP
echo
ECHO(3) 1 ECHO(3)echo - Output one or more stringsSYNOPSIS
void echo (string $arg1, [string $...])
DESCRIPTION
Outputs all parameters.
echo is not actually a function (it is a language construct), so you are not required to use parentheses with it. echo (unlike some other
language constructs) does not behave like a function, so it cannot always be used in the context of a function. Additionally, if you want
to pass more than one parameter to echo, the parameters must not be enclosed within parentheses.
echo also has a shortcut syntax, where you can immediately follow the opening tag with an equals sign. Prior to PHP 5.4.0, this short syn-
tax only works with the short_open_tag configuration setting enabled.
I have <?=$foo?> foo.
PARAMETERS
o $arg1
- The parameter to output.
o $...
-
RETURN VALUES
No value is returned.
EXAMPLES
Example #1
echo examples
<?php
echo "Hello World";
echo "This spans
multiple lines. The newlines will be
output as well";
echo "This spans
multiple lines. The newlines will be
output as well.";
echo "Escaping characters is done "Like this".";
// You can use variables inside of an echo statement
$foo = "foobar";
$bar = "barbaz";
echo "foo is $foo"; // foo is foobar
// You can also use arrays
$baz = array("value" => "foo");
echo "this is {$baz['value']} !"; // this is foo !
// Using single quotes will print the variable name, not the value
echo 'foo is $foo'; // foo is $foo
// If you are not using any other characters, you can just echo variables
echo $foo; // foobar
echo $foo,$bar; // foobarbarbaz
// Some people prefer passing multiple parameters to echo over concatenation.
echo 'This ', 'string ', 'was ', 'made ', 'with multiple parameters.', chr(10);
echo 'This ' . 'string ' . 'was ' . 'made ' . 'with concatenation.' . "
";
echo <<<END
This uses the "here document" syntax to output
multiple lines with $variable interpolation. Note
that the here document terminator must appear on a
line with just a semicolon. no extra whitespace!
END;
// Because echo does not behave like a function, the following code is invalid.
($some_var) ? echo 'true' : echo 'false';
// However, the following examples will work:
($some_var) ? print 'true' : print 'false'; // print is also a construct, but
// it behaves like a function, so
// it may be used in this context.
echo $some_var ? 'true': 'false'; // changing the statement around
?>
NOTES
Note
Because this is a language construct and not a function, it cannot be called using variable functions.
SEE ALSO print(3), printf(3), flush(3), Heredoc syntax.
PHP Documentation Group ECHO(3)