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Full Discussion: how to extract paragraphs from file in BASH script followed by prefix ! , !! and !!!
Top Forums Shell Programming and Scripting how to extract paragraphs from file in BASH script followed by prefix ! , !! and !!! Post 302165756 by joeyg on Friday 8th of February 2008 05:18:01 PM
Old 02-08-2008
Tools A try with bash
rm old alarm* files
will read an input file called alarms
put any beginning undefined lines into alarm
read thru the file, and based on ! or !! or !!! determine output file
write line to case'd filename

Note: once an alarm file is set, everything will be written there until a new alarm file is calculated.



#! /bin/bash

rm alarm alarm1 alarm2 alarm3
al_fl="alarm"
while read alt
do
al_pr=$(echo $alt | cut -d" " -f1)
case "$al_pr"
in
'!') al_fl="alarm1";;
'!!') al_fl="alarm2";;
'!!!') al_fl="alarm3";;
*) ;;
esac
# echo "$al_pr" "$al_fl"
echo "$alt">>"$al_fl"
done < alarms
 

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LEARN ABOUT CENTOS

alarm

ALARM(2)						     Linux Programmer's Manual							  ALARM(2)

NAME

       alarm - set an alarm clock for delivery of a signal

SYNOPSIS

       #include <unistd.h>

       unsigned int alarm(unsigned int seconds);

DESCRIPTION

       alarm() arranges for a SIGALRM signal to be delivered to the calling process in seconds seconds.

       If seconds is zero, any pending alarm is canceled.

       In any event any previously set alarm() is canceled.

RETURN VALUE

       alarm()	returns the number of seconds remaining until any previously scheduled alarm was due to be delivered, or zero if there was no pre-
       viously scheduled alarm.

CONFORMING TO

       SVr4, POSIX.1-2001, 4.3BSD.

NOTES

       alarm() and setitimer(2) share the same timer; calls to one will interfere with use of the other.

       sleep(3) may be implemented using SIGALRM; mixing calls to alarm() and sleep(3) is a bad idea.

       Scheduling delays can, as ever, cause the execution of the process to be delayed by an arbitrary amount of time.

SEE ALSO

       gettimeofday(2), pause(2), select(2), setitimer(2), sigaction(2), signal(2), sleep(3), time(7)

COLOPHON

       This page is part of release 3.53 of the Linux man-pages project.  A description of the project, and information about reporting bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

Linux								    2013-04-18								  ALARM(2)
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