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Full Discussion: script not working after "tail -f"
Top Forums Shell Programming and Scripting script not working after "tail -f" Post 302124833 by hankooknara on Monday 2nd of July 2007 08:41:46 PM
Old 07-02-2007
Aigles,

Can you please elaborate on

read -r option? Just read the definition and cannot understand why -r was used. thank you for your great work as always~



-r Backslash does not act as an escape character.
The backslash is considered to be part of the line. In
particular, a backslash-newline pair may not be used as a line
continuation.
Code:
#!/bin/bash
tail -f abc.log | 
while read -r line
do
   [[ "$line" != *exceptions* ]] && continue
   echo $line
   echo hi
done

 

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LEARN ABOUT FREEBSD

pon

PON(1)								    Debian PPPD 							    PON(1)

NAME

       pon, poff, plog - starts up, shuts down or lists the log of PPP connections

SYNOPSIS

       pon [ isp-name [ options ] ]
       poff [ -r ] [ -d ] [ -c ] [ -a ] [ -h ] [ isp-name ]
       plog [ arguments ]

DESCRIPTION

       This manual page describes the pon, plog and poff scripts, which allow users to control PPP connections.

   pon
       pon,  invoked  without  arguments,  runs the /etc/ppp/ppp_on_boot file, if it exists and is executable. Otherwise, a PPP connection will be
       started using configuration from /etc/ppp/peers/provider.  This is the default behaviour unless an isp-name argument is given.

       For instance, to use ISP configuration "myisp" run:

	      pon myisp

       pon will then use the options file /etc/ppp/peers/myisp.  You can pass additional pppd options after the ISP name, too.	pon can be used to
       run multiple, simultaneous PPP connections.

       pon takes the following command line options:

	      -q --quick
		     disconnect when ip-up finishes running.  This function is only available to the root user.

   poff
       poff closes a PPP connection. If more than one PPP connection exists, the one named in the argument to poff will be killed, e.g.

	      poff myprovider2

       will terminate the connection to myprovider2, and leave the PPP connections to e.g. "myprovider1" or "myprovider3" up and running.

       poff takes the following command line options:

	      -r     causes the connection to be redialed after it is dropped.

	      -d     toggles the state of pppd's debug option.

	      -c     causes pppd(8) to renegotiate compression.

	      -a     stops all running ppp connections. If the argument isp-name is given it will be ignored.

	      -h     displays help information.

	      -v     prints the version and exits.

	      If  no  argument is given, poff will stop or signal pppd if and only if there is exactly one running. If more than one connection is
	      active, it will exit with an error code of 1.

   plog
       plog shows you the last few lines of /var/log/ppp.log. If that file doesn't exist, it shows you the last few lines of your  /var/log/syslog
       file,  but  excluding  the  lines  not generated by pppd.  This script makes use of the tail(1) command, so arguments that can be passed to
       tail(1) can also be passed to plog.

       Note: the plog script can only be used by root or another system administrator in group "adm", due to security reasons. Also, to  have  all
       pppd-generated information in one logfile, that plog can show, you need the following line in your /etc/syslog.conf file:

       local2.*       -/var/log/ppp.log

FILES

       /etc/ppp/options
	      PPPd system options file.

       /etc/ppp/pap-secrets
	      System PAP passwords file.

       /etc/ppp/chap-secrets
	      System CHAP passwords file.

       /etc/ppp/peers/
	      Directory holding the peer options files. The default file is called provider.

       /etc/chatscripts/provider
	      The chat script invoked from the default /etc/ppp/peers/provider.

       /var/log/ppp.log
	      The default PPP log file.

AUTHORS

       The p-commands were written by Christoph Lameter <clameter@debian.org>.	Updated and revised by Philip Hands <phil@hands.com>.
       This  manual was written by Othmar Pasteka <othmar@tron.at>. Modified by Rob Levin <lilo@openprojects.net>, with some extensions taken from
       the old p-commands manual written by John Hasler <jhasler@debian.org>.

SEE ALSO

       pppd(8), chat(8), tail(1).

Debian Project							     July 2000								    PON(1)
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