09-05-2008
Seems to work for me on Linux. I get errors on OS X and OpenBSD though (doesn't understand the -re option).
What are you doing your work on?
Carl
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
I try to test the carriage return in a variable.
$ LENGTH=`expr $VARIABLE : ".*"` will return the length of the variable. But this doesn't work if $VARIABLE has zero length.
Any help will be well appreciated.
Thanks in advance.
Giovanni (4 Replies)
Discussion started by: gio123bg
4 Replies
2. Shell Programming and Scripting
I have observed with print & echo, they produce carriage return <CR> or newline, after they display string next to them.
Is there anyway to avoide these <CR> after the intended string is displayed? (3 Replies)
Discussion started by: videsh77
3 Replies
3. UNIX for Dummies Questions & Answers
Hi All
I have a field being returned from the DB that when opened in Vi shows a ^M before the rest of the field is displayed on the next line.
I need it so that the only newline character is the end of the line since I need to transform my file into an Excel report.
Thus my idea is to... (1 Reply)
Discussion started by: djkane
1 Replies
4. Shell Programming and Scripting
--------------------------------------------------------------------------------
Hi All
I have a field being returned from the DB that when opened in Vi shows a ^M before the rest of the field is displayed on the next line.
I need it so that the only newline character is the end of the... (14 Replies)
Discussion started by: djkane
14 Replies
5. UNIX for Dummies Questions & Answers
hi can anyone please tell me the difference between carriage return, linefeed and newline ? (2 Replies)
Discussion started by: streetfi8er
2 Replies
6. Shell Programming and Scripting
Hi all,
need your help in replacing carriage return in a record.
Input:
col1|col2|col3|col4|col5|col6|col7|col8|col9|col10
1|aa|bb|cc|dd|eee
eee|ff|ggggg|hh
hhh|iii
2|zz|yy|xx|ww|vv|uu|tt|ss|rr
Output:
col1|col2|col3|col4|col5|col6|col7|col8|col9|col10... (12 Replies)
Discussion started by: agathaeleanor
12 Replies
7. Shell Programming and Scripting
Hey folks,
I've been working on this for some time. Seems simple, but I'm stumped.
I need the following data format:
New_York:Commercial
Geology
Geophysics
Petrophysics
Production_Engineering
Reservoir_Engineering
Pasadena:Commercial
... (5 Replies)
Discussion started by: leepet01
5 Replies
8. Shell Programming and Scripting
Hello,
How do i usecarriage return in ksh.
I want to do an echo "bla bla" and another echo "bla bla" will appear and replace the first echo on screen.
I tried:
until ; do
echo "bla bla \r"
done
please advice.
Thanks. (3 Replies)
Discussion started by: LiorAmitai
3 Replies
9. Shell Programming and Scripting
Hello all,
I've a flat file in the following format:
AB\001\CDED\001\ABC\001\nEG\001\HIJF\001\EFG\001\nHI\003\HIUL\003\HIJ\003
And I want to substitute \n with the carriage return. Any help is appreciated!
Regards,
- Seth (8 Replies)
Discussion started by: sethmj
8 Replies
10. UNIX for Dummies Questions & Answers
I need to remove the carriage return comes inbetween the record.
Need to have CR only at the end.
I used the below command.
tr -d '\n' < filewithcarriagereturns > filewithoutcarriagereturns
But its removing all the CR and giving one line output.
Input File:
12345
abcdegh... (11 Replies)
Discussion started by: srvn_saru
11 Replies
LEARN ABOUT SUSE
pcap_get_selectable_fd
PCAP_GET_SELECTABLE_FD(3PCAP) PCAP_GET_SELECTABLE_FD(3PCAP)
NAME
pcap_get_selectable_fd - get a file descriptor on which a select() can be done for a live capture
SYNOPSIS
#include <pcap/pcap.h>
int pcap_get_selectable_fd(pcap_t *p);
DESCRIPTION
pcap_get_selectable_fd() returns, on UNIX, a file descriptor number for a file descriptor on which one can do a select() or poll() to wait
for it to be possible to read packets without blocking, if such a descriptor exists, or -1, if no such descriptor exists. Some network
devices opened with pcap_create() and pcap_activate(), or with pcap_open_live(), do not support select() or poll() (for example, regular
network devices on FreeBSD 4.3 and 4.4, and Endace DAG devices), so -1 is returned for those devices.
Note that in:
FreeBSD prior to FreeBSD 4.6;
NetBSD prior to NetBSD 3.0;
OpenBSD prior to OpenBSD 2.4;
Mac OS X prior to Mac OS X 10.7;
select() and poll() do not work correctly on BPF devices; pcap_get_selectable_fd() will return a file descriptor on most of those versions
(the exceptions being FreeBSD 4.3 and 4.4), but a simple select() or poll() will not indicate that the descriptor is readable until a full
buffer's worth of packets is received, even if the read timeout expires before then. To work around this, an application that uses
select() or poll() to wait for packets to arrive must put the pcap_t in non-blocking mode, and must arrange that the select() or poll()
have a timeout less than or equal to the read timeout, and must try to read packets after that timeout expires, regardless of whether
select() or poll() indicated that the file descriptor for the pcap_t is ready to be read or not. (That workaround will not work in FreeBSD
4.3 and later; however, in FreeBSD 4.6 and later, select() and poll() work correctly on BPF devices, so the workaround isn't necessary,
although it does no harm.)
Note also that poll() doesn't work on character special files, including BPF devices, in Mac OS X 10.4 and 10.5, so, while select() can be
used on the descriptor returned by pcap_get_selectable_fd(), poll() cannot be used on it those versions of Mac OS X. Kqueues also don't
work on that descriptor. poll(), but not kqueues, work on that descriptor in Mac OS X releases prior to 10.4; poll() and kqueues work on
that descriptor in Mac OS X 10.6 and later.
pcap_get_selectable_fd() is not available on Windows.
RETURN VALUE
A selectable file descriptor is returned if one exists; otherwise, -1 is returned.
SEE ALSO
pcap(3PCAP), select(2), poll(2)
5 April 2008 PCAP_GET_SELECTABLE_FD(3PCAP)