So in my shell i execute:
{ while true; do echo string; sleep 1; done } | read line This waits one second and returns.
But
{ while true; do /bin/echo string; sleep 1; done } | read line continues to run, and doesn't stop until i kill it explicitly.
I have tried this in bash as well as zsh,... (2 Replies)
Is there a command where I can pipe my grep into it and it will output it with spaces rather than returns?
Example
I want to turn
prompt$ grep blah file
blah
blah
into this
prompt$ grep blah file | someCommand
blah blah (1 Reply)
Bit of a weird one i suppose, i want to use an echo inside an echo... For example...
i have a script that i want to use to take users input and create another script. Inside this script it creates it also needs to use echos...
echo "echo "hello"" >$file
echo "echo "goodbye"" >$file
... (3 Replies)
Hi,
How do you echo something once when a find statement returns null results?
This is when using mutiple locations and mutiple arguments.
The below find command the inner loop of a nested for loop where the outter loop holds the $args and the inner loop holds the locations.
find... (2 Replies)
Hi all,
I am trying to grep a .txt file for a word. When I hit enter, it returns back to $
The file is 4155402 in size and is named in this way:
*_eveningtimes_done_log.txt
I use this command, being in the same directory as the file:
grep -i "invalid" *_eveningtimes_done_log.txt
... (16 Replies)
echo `echo ` doesn't echoes anything. And it's logic. But
echo `echo `echo ` ` does echoes "echo". What's the logic of it? the `echo `echo ` inside of the whole (first) echo, echoes nothing, so the first echo have to echo nothing but echoes "echo"
(too much echoing :P):o (2 Replies)
I have been experiencing this problem intermittantly, I thought the problem was '/bin/sh -> /bin/dash' but I changed that to bash and the problem persists.
I am writing functions to be included in user's '.bash_profile' through source or '.' filename a quick example of the problem is illustrated... (3 Replies)
Hi,
I develop simple animation ping script on Solaris Platform. It is like Cisco ping.
Examples and source code are below.
bash-3.00$ gokcell 152.155.180.8 30
Sending 30 Ping Packets to 152.155.180.8
!!!!!!!!!!!!!.!!!!!!!!!!!!!!!.
% 93.33 success... % 6.66 packet loss...... (1 Reply)
Hi
I am using perl to ping a list of nodes - with script below :
$p = Net::Ping->new("icmp");
if ($p->ping($host,1)){
print "$host is alive.\n";
}
else {
print "$host is unreacheable.\n";
}
$p->close();... (4 Replies)
help with bash script!
im am working on this script to make sure my server will stay online, so i made this script..
HOSTS="192.168.138.155"
COUNT=4
pingtest(){
for myhost in "$@"
do
ping -c "$COUNT" "$myhost" &&return 1
done
return 0
}
if pingtest $HOSTS
#100% failed... (4 Replies)
Discussion started by: mort3924
4 Replies
LEARN ABOUT REDHAT
ipfstat
ipfstat(1M) System Administration Commands ipfstat(1M)NAME
ipfstat - reports on packet filter statistics and filter list
SYNOPSIS
ipfstat [-aACdfghIilnosv]
ipfstat [-C] [-D addrport] [-P protocol] [-S addrport] [-T refreshtime]
DESCRIPTION
The ipfstat command examines /dev/kmem using the symbols _fr_flags, _frstats, _filterin, and _filterout. To run and work, it needs to be
able to read both /dev/kmem and the kernel itself.
The default behavior of ipfstat is to retrieve and display the statistics which have been accumulated over time as the kernel has put pack-
ets through the filter.
The role of ipfstat is to display current kernel statistics gathered as a result of applying the filters in place (if any) to packets going
in and out of the kernel. This is the default operation when no command line parameters are present. When supplied with either -i or -o,
ipfstat will retrieve and display the appropriate list of filter rules currently installed and in use by the kernel.
ipfstat's use is restricted through access to /dev/ipl and /dev/ipstate. The default permissions of these files require ipfstat to be run
as root for all operations.
Using the -t option causes ipfstat to enter the state top mode. In this mode the state table is displayed similarly to the way the Unix top
utility displays the process table. The -C, -D, -P, -S and -T command line options can be used to restrict the state entries that will be
shown and to specify the frequency of display updates.
In state top mode, use the following keys to influence the displayed information:
d Select information to display.
l Redraw the screen.
q Quit the program.
s Switch between different sorting criteria.
r Reverse the sorting criteria.
States can be sorted by protocol number, by number of IP packets, by number of bytes, and by time-to-live of the state entry. The default
is to sort by the number of bytes. States are sorted in descending order, but you can use the r key to sort them in ascending order.
It is not possible to interactively change the source, destination, and protocol filters or the refresh frequency. This must be done from
the command line.
The screen must have at least 80 columns for correct display. However, ipfstat does not check the screen width.
Only the first X-5 entries that match the sort and filter criteria are displayed (where X is the number of rows on the display). There is
no way to see additional entries.
OPTIONS
The following options are supported:
-a
Display the accounting filter list and show bytes counted against each rule.
-A
Display packet authentication statistics.
-C
Valid only in combination with -t. Display "closed" states as well in the top. Normally, a TCP connection is not displayed when it
reaches the CLOSE_WAIT protocol state. With this option enabled, all state entries are displayed.
-d
Produce debugging output when displaying data.
-D addrport
Valid only in combination with -t. Limit the state top display to show only state entries whose destination IP address and port match
the addrport argument. The addrport specification is of the form ipaddress[,port]. The ipaddress and port should be either numerical or
the string any (specifying any IP address and any port, in that order). If the -D option is not specified, it defaults to -D any,any.
-f
Show fragment state information (statistics) and held state information (in the kernel) if any is present.
-g
Show groups currently configured (both active and inactive).
-h
Show per-rule the number of times each one scores a "hit". For use in combination with -i.
-i
Display the filter list used for the input side of the kernel IP processing.
-I
Swap between retrieving inactive/active filter list details. For use in combination with -i.
-l
When used with -s, show a list of active state entries (no statistics).
-n
Show the rule number for each rule as it is printed.
-o
Display the filter list used for the output side of the kernel IP processing.
-P protocol
Valid only in combination with -t. Limit the state top display to show only state entries that match a specific protocol. The argument
can be a protocol name (as defined in /etc/protocols) or a protocol number. If this option is not specified, state entries for any pro-
tocol are specified.
-s
Show packet/flow state information (statistics only).
-S addrport
Valid only in combination with -t. Limit the state top display to show only state entries whose source IP address and port match the
addrport argument. The addrport specification is of the form ipaddress[,port]. The ipaddress and port should be either numerical or the
string any (specifying any IP address and any port, in that order). If the -S option is not specified, it defaults to -S any,any.
-t
Show the state table in a way similar to the way the Unix utility, top, shows the process table. States can be sorted in a number of
different ways.
-T refreshtime
Valid only in combination with -t. Specifies how often the state top display should be updated. The refresh time is the number of sec-
onds between an update. Any positive integer can be used. The default (and minimal update time) is 1.
-v
Turn verbose mode on. Displays additional debugging information.
FILES
o /dev/kmem
o /dev/ksyms
o /dev/ipl
o /dev/ipstate
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWipfu |
+-----------------------------+-----------------------------+
|Interface Stability |Evolving |
+-----------------------------+-----------------------------+
SEE ALSO ipf(1M), attributes(5)NOTES
To view license terms, attribution, and copyright for IP Filter, the default path is /usr/lib/ipf/IPFILTER.LICENCE. If the Solaris operat-
ing environment has been installed anywhere other than the default, modify the given path to access the file at the installed location.
SunOS 5.10 12 Nov 2003 ipfstat(1M)
10-13-2011
