exec in this form is for redirecting the file descriptors of the process.
Think of it this way; if you always want to do "myscript 2>/tmp/fnord 1>&2" then you can say this inside myscript, right at the beginning:
Then the redirections are no longer needed at the prompt when you run myscript.
So in your example, the script's input file descriptor (what every command will be reading from if not given a file argument -- read, cat, grep, you name it) from that point on is /dev/console, output from all commands will go to /dev/console (unless separately redirected, of course), and errors will go to the same (2>&1 means send standard error where-ever standard output is).
Sir,
I using the following commands in a file (part of a bigger script):
#!/bin/bash
cd /opt/oracle/bin
ls -lt | tail -1 | awk '{print $6}' >> /tmp/ramb.out
If I run this from the command prompt the result is:
2007-05-16
if I run it as a cron job then... (5 Replies)
Hi ,
I have a piece of code ...wherein I need to assign the following ...
1) A command line argument to a variable
e.g origCount=ARGV
2) A unix command to a variable
e.g result=`wc -l testFile.txt`
in my awk shell script
When I do this :
print "origCount" origCount --> I get the... (0 Replies)
AIX:Command to get netaddress/subnet address command in IPv4/IP6
Can anybody help us with a command to retrieve netaddress/subnet address command in IPv4/IP6 on aix machine.
net/subnet address is in the format 172.16.212.0(signifies all 255 machines in an IPv4 network) (2 Replies)
Hi everyone,
when executing this command in unix:
echo "WM7 Fatal Alerts:", $(cat query1.txt) > a.csvIt works fine, but running this command in a shell script gives an error saying that there's a syntax error.
here is content of my script:
tdbsrvr$ vi hc.sh
"hc.sh" 22 lines, 509... (4 Replies)
Hi,
Well my title isn't very clear I think. So to understand my goal:
I have a script "test1"
#!/bin/bash
xvkbd -text blabla
with xbindkeys, I bind F5 key in order it runs my test1 script
So when I press F5, test1 runs.
I'm under Emacs/Vi and I press F5 in order to have "blabla" be... (0 Replies)
HI Guys,
I hope you are well. I am trying to write a script that gets executed every time i open a shell (cshell). I have two questions about that
1) I need to enter these commands
$ echo $DISPLAY
$ setenv $DISPLAY output_of_echo_$display_command
How can i write a... (2 Replies)
I am working with a sh script on a solaris 9 zone (sol 10 host) that grabs information to build the configuration command line. the variables Build64, SSLopt, CONFIGopt, and CC are populated in the script. the script includes
CC=`which gcc`
CONFIGopt=' --prefix=/ --exec-prefix=/usr... (8 Replies)
below is the output xml string from some other command and i will be parsing it using awk
cat /tmp/alerts.xml
<Alert id="10102" name="APP-DS-ds_ha-140018-componentFailure-S" alertDefinitionId="13982" resourceId="11427" ctime="1359453507621" fixed="false" reason="If Event/Log Level(ANY) and... (2 Replies)
exec(): 0509-036 Cannot load program /usr/opt/freeware/bin/rpm because of the following errors:
0509-022 Cannot load module /opt/freeware/lib/libintl.a(libintl.so.1).
0509-150 Dependent module /opt/freeware/lib/libiconv.a(shr4.o) could not be loaded.
0509-152 Member... (4 Replies)
Hello Forum,
I'm making very good progress on my report thanks to the very helpful people on this forum. I've been able to successfully create my report for my Red Hat servers. But I do have a few ubuntu servers in the mix and I'd like to capture some data from them when an ssh connection is... (8 Replies)
Discussion started by: greavette
8 Replies
LEARN ABOUT DEBIAN
amqp-consume
AMQP-CONSUME(1) RabbitMQ C Client AMQP-CONSUME(1)NAME
amqp-consume - Consume messages from a queue on an AMQP server
SYNOPSIS
amqp-consume [OPTION...] {command} [args...]
DESCRIPTION
amqp-consume consumes messages from a queue on an AMQP server. For each message that arrives, a receiving command is run, with the message
body supplied to it on standard input.
amqp-consume can consume from an existing queue, or it can create a new queue. It can optionally bind the queue to an existing exchange.
By default, messages will be consumed with explicit acknowledgements. A message will only be acknowledged if the receiving command exits
successfully (i.e. with an exit code of zero). The AMQP "no ack" mode (a.k.a. auto-ack mode) can be enable with the -A option.
OPTIONS -q, --queue=queue name
The name of the queue to consume messages from.
If the --queue option is omitted, the AMQP server will assign a unique name to the queue, and that server-assigned name will be
dixsplayed on stderr; this case implies that an exclusive queue should be declared.
-e, --exchange=exchange name
Specifies that an exclusive queue should be declared, and bound to the given exchange. The specified exchange should already exist
unless the --exchange-type option is used to request the creation of an exchange.
-r, --routing-key=routing key
The routing key for binding. If omitted, an empty routing key is assumed.
-d, --declare
Forces an exclusive queue to be declared, even when it otherwise would not be. That is, when a queue name is specified with the --queue
option, but no binding to an exchange is requested with the --exchange option.
-A, --no-ack=routing key
Enable "no ack" mode: The AMQP server will unconditionally acknowledge each message that is delivered, regardless of whether the target
command exits successfully or not.
EXAMPLES
Consume messages from an existing queue "myqueue", and output the message bodies on standard output via cat:
$ amqp-publish -q myqueue cat
Bind a new exclusive queue to an exchange "myexch", and send each message body to the script myscript, automatically acknowledging them on
the server:
$ amqp-consume -A -e myexch ./myscript
SEE ALSO librabbitmq-tools(7) describes connection-related options common to all the RabbitMQ C Client tools.
AUTHOR
The RabbitMQ Team <info@rabbitmq.com>
RabbitMQ C Client 2011-01-01 AMQP-CONSUME(1)