I'm writing a bash script, and I was wondering what proper programming etiquette was for piping. How many pipes is too many pipes?
My next step would be to tar those directories, then move them. I'm not asking if it's a matter of CAN I pipe it all, but SHOULD I pipe it all. As its proper to indent while in a loop, is there a unanimous rule for amount of pipes?
I'm a frequent visitor to these forums. I generally enjoy topics that are posted as well as the responses. I really pickup a lot of new things to learn.
However, there is one thing that does bother me here. (I dont mean to start a flame war, or any problems at all, just expressing some... (8 Replies)
I have a series of new machines that are internet facing (have IP's that are accessible via the 'net) and it has internal facing interfaces. I need to be able to communicate back to the internal network to a specific server which processes monitoring and e-mail traffic. I've been told that I should... (3 Replies)
My goal was to find any directories inside of any directory called "09_Client Original" not modified in the last 30 days.
$ find /Volumes/Jobs_Volume/ -type d -name "09_Client Original" -exec find {} -mtime +30 -type d -maxdepth 1 \;
The results of this find are passed along in a perl script... (1 Reply)
foll. is my code snippet.
#!/bin/ksh
retVal=`sqlplus -s user/passwd@oracle_sid <<EOF
SET SERVEROUTPUT ON SIZE 100000
DECLARE
STATUS_VALUE CHAR;
BEGIN
SELECT temp1 INTO STATUS_VALUE FROM sai;
DBMS_OUTPUT.PUT_LINE(STATUS_VALUE);
END;
/
SET... (1 Reply)
Hi,
Below is my script which creates a file:
#!/bin/sh
if
then
echo "Enter bill period "
echo "Syntax: sh cpd.sh G08"
exit
fi
sqlplus uname/pwd@dbname <<EOF
set WRAP off
set FEEDBACK off
set PAGESIZE 0
set VERIFY off (14 Replies)
I'm learning UNIX on my mac (BSD), using a manual. I'm trying to figure out the grep command, and am getting something wrong. I've opened one of my files in NeoOffice and am looking for a string, the phrase 'I am writing.' I've been to some sites to get the proper syntax, and from what I can see... (5 Replies)
I have written a Bash Script that captures video via the Linux application DVgrab. When run my script prompts the terminal user to enter all the necessary information for the capture, save location, file name, file type capture duration etc...
These are all in the form of
#!/bin/bash
echo... (5 Replies)
Hello,
On a linux server (centos 5.4), users upload file that should be flv. How can I check that the file is a real and proper flv file? Checking the extension is not enough!
Thanks (1 Reply)
Recently i started to work in new company. I will replace old admin who is going into retirement and he has been showing me his procedures for server, database and network administration.
From first point of view: there is absolutely no configuration management involved how they deploy software... (0 Replies)
Hey guys, not sure should I post it here or in 'What is on Your Mind?'
I'm discussing usage of DSL (domain specific language) in security tools with my colleagues. We haven't been able to reach an agreement over naming conventions.
There are many tools using DSL: splunk, sumologic,... (2 Replies)
Discussion started by: Tobby P
2 Replies
LEARN ABOUT HPUX
pipe
pipe(2) System Calls Manual pipe(2)NAME
pipe() - create an interprocess channel
SYNOPSIS DESCRIPTION
creates an I/O mechanism called a pipe and returns two file descriptors, fildes[0] and fildes[1]. fildes[0] is opened for reading and
fildes[1] is opened for writing.
A read-only file descriptor fildes[0] accesses the data written to fildes[1] on a first-in-first-out (FIFO) basis. For details of the I/O
behavior of pipes see read(2) and write(2).
By default, HP-UX pipes are not STREAMS-based. It is possible to generate the kernel so that all pipes created on a system are STREAMS-
based. This can only be done for HP-UX releases 10.0 and later. STREAMS-based FIFOs (created by or are not supported on HP-UX.
To generate a kernel that supports STREAMS-based pipes:
o STREAMS/UX must be installed.
o The module and the driver must be included in the file. (When STREAMS/UX is installed, and are automatically added to the system
file.)
o The tunable parameter (see streampipes(5)) must be set to 1 in the file. (This is not automatically done when STREAMS/UX is
installed.)
o The kernel must be generated and the system rebooted. Once this is done, all pipes created by will be STREAMS-based.
For more information, see
EXAMPLES
The following example uses to implement the command string
RETURN VALUE
returns one of the following values:
Successful completion.
Failure.
is set to indicate the error.
ERRORS
sets to one of the following error values if the corresponding condition is true.
or more file descriptors are currently open.
The system file table is full.
The file system lacks sufficient space to create the pipe.
Could not allocate resources for both Stream heads
(STREAMS-based pipes only).
SEE ALSO sh(1), read(2), write(2), popen(3S), privileges(5), streampipes(5), streamio(7).
STANDARDS CONFORMANCE pipe(2)