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Top Forums Shell Programming and Scripting Read input while another command is running && Post 302901786 by alister on Thursday 15th of May 2014 03:25:02 PM
Old 05-15-2014
Quote:
Originally Posted by cnamejj
If you want to keep the current logic, where you hit "q" to stop and that also stops the "tshark", then you need to do something more sophisticated.

You'll have to run "tshark" as a background process, capture the PID in the shell script, then if "q" is entered kill that PID before exiting.
If the entire script is one logical task, then the simplest solution is to use kill 0 to terminate the entire process group.

Regards,
Alister
 

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KILL(1) 						      General Commands Manual							   KILL(1)

NAME
kill - terminate a process with extreme prejudice SYNOPSIS
kill [ -sig ] processid ... kill -l DESCRIPTION
Kill sends the TERM (terminate, 15) signal to the specified processes. If a signal name or number preceded by `-' is given as first argu- ment, that signal is sent instead of terminate (see sigvec(2)). The signal names are listed by `kill -l', and are as given in /usr/include/signal.h, stripped of the common SIG prefix. The terminate signal will kill processes that do not catch the signal; `kill -9 ...' is a sure kill, as the KILL (9) signal cannot be caught. By convention, if process number 0 is specified, all members in the process group (i.e. processes resulting from the current login) are signaled (but beware: this works only if you use sh(1); not if you use csh(1).) Negative process numbers also have special meanings; see kill(2) for details. The killed processes must belong to the current user unless he is the super-user. The process number of an asynchronous process started with `&' is reported by the shell. Process numbers can also be found by using ps(1). Kill is a built-in to csh(1); it allows job specifiers of the form ``%...'' as arguments so process id's are not as often used as kill arguments. See csh(1) for details. SEE ALSO
csh(1), ps(1), kill(2), sigvec(2) BUGS
A replacement for ``kill 0'' for csh(1) users should be provided. 4th Berkeley Distribution April 20, 1986 KILL(1)
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