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Full Discussion: Help with 56kbit Modem Scripting
Top Forums Shell Programming and Scripting Help with 56kbit Modem Scripting Post 302999853 by Corona688 on Wednesday 28th of June 2017 05:03:22 PM
Old 06-28-2017
Quote:
Originally Posted by krustowski
Thank you both for reply! Unfortunately, I am not quite sure how to use the exec command. It seems like that the tother method (<>) is quite useful, but I have no idea how can I write to the log continuously.
You use it like I show it, basically. It's among other things the shell's "open a file" setting. Here I use it to open file descriptor 5, in read-write <> mode.

File descriptors 0, 1, and 2 are standard in, standard out, and standard error, respectively. Numbers 3 and up are generally not opened yet in a shell and can be used as you please.

Code:
exec 6<inputfile # Open file for read
read LINE <&6 # Read a line from it
exec 6<&- # Close file

exec 7>logfile # open a file for write
echo asdf > &7 # Write to file
exec 7>&- # Close file

Does my code not work, or not fulfill your purpose? What is your question?
 

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LEARN ABOUT DEBIAN

airport-modem

AIRPORT-MODEM(1)					      General Commands Manual						  AIRPORT-MODEM(1)

NAME

       airport-modem  - Modem monitoring and hangup utility for the original Apple AirPort Base Station ("Graphite"), the Lucent RG-1000 base sta-
       tion and the Apple Airport Extreme base station

SYNOPSIS

       airport-modem

DESCRIPTION

       airport-modem allows you to monitor the state of the internal modem of your base station and to start/stop the modem connection.

       On the AirPort Extreme base station, the modem utility can also display the approximate duration of the modem connection.

OPTIONS

       airport-modem accepts no command-line options. airport-modem is a wrapper script around the AirportBaseStationHangup.jar jar  file  located
       in /usr/share/java/airport-utils.

       You  can set the JAVACMD environment variable to use a specific JVM instead of the one chosen by the wrapper script. Set the DEBUG environ-
       ment variable to 1 to get the debug output from the wrapper script.

ENVIRONMENT VARIABLES

       DEBUG  Set this variable to 1 to get the debug output from the wrapper script.

       JAVACMD
	      The full path to the Java Virtual Machine to use.  By  default,  the  wrapper  uses  JAVACMD;  if  it  is  not  set,  it	looks  for
	      JAVA_BINDIR/java, then for JAVA_HOME/bin/java before looking for a java executable in the PATH. In the latter case, the JVM used can
	      be configured using the Debian alternatives system (see update-alternatives(8)).

       JAVA_HOME
	      The full path where your JDK/JRE is installed.

       JAVA_BINDIR
	      The full path to the directory where the java executable is located.

       JAVA_ARGS
	      Extra command-line arguments to be passed to the Java Virtual Machine.

AUTHOR

       airport-modem was written by Jon Sevy <jsevy@cs.drexel.edu>.

       This manual page was written by Julien BLACHE <jblache@debian.org>, for the Debian project (but may be used by others).

								   May 20, 2006 						  AIRPORT-MODEM(1)
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