exit status conditions Post: 302117790

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exit status

i downloaded a text file from metalab.unc.edu called sh.txt and in this reference manual it refers to shell scripting exit status .. at the end of one of the examples that author gave an exit status of 127.. to what does a 127 exit status refer too and what is its purpose in the code. moxxx68

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Hi, Consider the output of the following commands: case1) ------- # ifconfig -a | grep "UP" | grep uplink0:1 # echo $? Output is: 0 case2 ------ # ifconfig -a | grep "UP" | grep uplink0:1; echo $? Output is: 1 In case2 we got the exit code as 1, which is the actual exit code....

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$? = Exit status variable

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tttview

tttview(1)								net								tttview(1)

NAME

       tttview - Tele Traffic Tapper viewer- a viewer program for remote, real-time, graphical traffic-monitoring.

SYNTAX

       tttview [-addr recv_addr] [-mcastifaddr addr] [-multicast] [-port recv_port] [-probe addr] [-yscale (K|M|n)]

DESCRIPTION

       tttview is the viewer program in the ttt program suite. tttview displays traffic-data collected on a remote host by tttprobe.

       To run tttview, it is not necessary to be "root".

       The  ttt program suite is yet another descendant of tcpdump but it is capable of real-time, graphical, local and remote traffic-monitoring.
       It won't replace tcpdump, rather, it helps you find out what to look into with tcpdump.

OPTIONS

       -addr recv_addr
	      Specifies the local address. Only useful for multicast addresses. If omitted, "224.8.8.0 is used as default.

       -mcastifaddr addr
	      Specifies the multicast interface address. Only useful when an interface is selected to join a multicast group.

       -multicast
	      Shorthand for the default multicast destination "224.8.8.0".

       -port recv_port
	      Specifies the udp port number to receive traffic-data from a remote tttprobe. If omitted, port 7288 is used as default.

       -probe addr
	      Specifies the address of a probe. Only useful to select one among multiple probes.

       -yscale ('K'|'M'|n)
	      change the scale of y-axis. 'K' and 'M' represent 1000 and 1000000 respectively.

EXAMPLES

       Remark: "hostA" is allways the host where traffic-data is collected with tttprobe and "hostB" is allways the host where the traffic-data is
       displayed with tttview.

       point-to-point monitoring:

	      hostA: tttprobe hostB
	      hostB: tttview

	      or:

	      hostA: tttprobe ip_of_hostB
	      hostB: tttview

       multicast:

	      when using the default multicast address:

	      hostA: tttprobe -multicast
	      hostB: tttview -multicast

	      this is equivalent to:

	      hostA: tttprobe 224.8.8.0
	      hostB: tttview -addr 224.8.8.0

AUTHORS

       tttview was written by Kenjiro Cho < kjc@csl.sony.co.jp>.

       This  manual page was written by Thomas Scheffczyk <thomas.scheffczyk@verwaltung.uni-mainz.de>, for the Debian GNU/Linux system (but may be
       used by others).

SEE ALSO

       ttt(1), tttprobe(1)

Kenjiro Cho								1.7								tttview(1)

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

exit status

Discussion started by: moxxx68

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Discussion started by: diganta

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Checking Exit Status

Discussion started by: PrimeRibAndADew

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How to get the exit status

Discussion started by: yhacks