08-11-2013
Why does du -sk * not work?
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
my script gives 10 outputs continuously..In each output i have to remove the first line in the output.How to do that.
for eg : below is my output
0.00
1.00
5.00
0.00
7.00
i have to remove the first line of this output ie;0.00 (3 Replies)
Discussion started by: Krrishv
3 Replies
2. Shell Programming and Scripting
I am using following code to read myfile.ddl line by line. But the thing is it is printing lot of garbage which are the names of the files and directories in which myfile.ddl is present. Kindly refine the code so that only myfile.ddl contents are only read
LOGFILE="logfile.txt"... (4 Replies)
Discussion started by: skyineyes
4 Replies
3. Shell Programming and Scripting
Hello all,
I have a script that has an infile with system package information. For the most part the script is looking well. The only thing i need help is in testing for null entries and removing null data.
#!/usr/bin/ksh
for i in `cat /mwncps/bin/eco_pack`
do
NAME=`pkginfo -l |... (2 Replies)
Discussion started by: liketheshell
2 Replies
4. Shell Programming and Scripting
hi i'm new to shell scripts and have a small problem
i am running a batch converter that returns all flash .flv files in a directory and create a png image from each one
the problem i have is the $1 variable , its ok on the first call but on the secound call $1.png , i have extra... (1 Reply)
Discussion started by: wingchun22
1 Replies
5. Shell Programming and Scripting
Im running the below commands in a script.
Total_confirms=`cat $OUTPATH/count_po* | head -4 | tail -1`
#
echo "Total Confirms records we need: $Total_confirms" >> $LOG2
The problem is its always returning 4 spaces before the result.. Can I pipe the result into something else to remove the... (5 Replies)
Discussion started by: Jazmania
5 Replies
6. Shell Programming and Scripting
Hi
Does anyone know of a command that will extract only the Login name alison and year 2005 from the following output.
jamesm> finger alison
Login name: alison In real life: Alison Smith - Queensland
Directory: /data/home/alison Shell: /usr/bin/ksh... (2 Replies)
Discussion started by: jamba1
2 Replies
7. Shell Programming and Scripting
Below script perfectly works, giving below mail output. BUT, I want to make the script mail only if there are any D-Defined/T-Transition/B-Broken State WPARs and also to copy the output generated during monitoring to a temporary log file, which gets cleaned up every week. Need suggestions.
... (4 Replies)
Discussion started by: aix_admin_007
4 Replies
8. UNIX for Dummies Questions & Answers
Hi All,
I am fetching oracle query result in shell variable. As columns numbers are more the output wraps in unix terminal .i.e one complete record in db gets store in multiple lines. with each line ends with $ character. I want to remove these unnecessary $ character but to keep required $... (8 Replies)
Discussion started by: Harshal22
8 Replies
9. Shell Programming and Scripting
Hi All,
In my output file i am getting control m character and also the line feeds at different places and with different combinations, the content of the file is supposed to be in a single line but if there is a line feed in between then from there onwards it's going into new line.
I tried... (7 Replies)
Discussion started by: Bipin Kumar
7 Replies
10. Shell Programming and Scripting
Hi guys,
So I am using an awk command to return a specific column in a file.
I also need to remove some extra characters.
What I have is ::
(http-/0.0.0.0:8091-9)|23:00:41
And what I want is :
http-/0.0.0.0:8091-9
I tried using the td command but it is only removing the ( ,... (5 Replies)
Discussion started by: Junaid Subhani
5 Replies
LEARN ABOUT OSX
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)