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Full Discussion: Awk doubt
Top Forums Shell Programming and Scripting Awk doubt Post 302383516 by royalibrahim on Wednesday 30th of December 2009 04:49:39 AM
Old 12-30-2009
Awk doubt

I have a file sample.txt with the following contents:

Quote:
trap is a software interrupt
usually the result of an error condition.

default action when a process receives a signal is to terminate.

user may press the interrupt key or send a kill command to the process

In UNIX, any of these events can cause a signal

the following gives output as
Code:
awk 'NF{s=$0; print s}' sample.txt

Quote:
trap is a software interrupt
usually the result of an error condition.
default action when a process receives a signal is to terminate.
user may press the interrupt key or send a kill command to the process
In UNIX, any of these events can cause a signal
but,
Code:
awk 'NF{s=$0}{print s}' sample.txt

gives output as
Quote:
trap is a software interrupt
usually the result of an error condition.
usually the result of an error condition.
default action when a process receives a signal is to terminate.
default action when a process receives a signal is to terminate.
user may press the interrupt key or send a kill command to the process
user may press the interrupt key or send a kill command to the process
In UNIX, any of these events can cause a signal
why this difference, can someone explain me?
 

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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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