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Full Discussion: read command
Top Forums Shell Programming and Scripting read command Post 302400966 by alister on Thursday 4th of March 2010 03:48:29 PM
Old 03-04-2010
Hi djehresmann:

Code:
while ! [ "$answer" ]; do read answer; done

or
Code:
while [ -z "$answer" ]; do read answer; done

Obviously, answer needs to be unset or empty when entering the while loop. Less obviously, assuming a default IFS value, leading whitespace will be discarded, so if whitespace alone is considered valid, you will want to set IFS to the null string (IFS='' read answer).

Regards,
Alister
 

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FAXANSWER(8C)															     FAXANSWER(8C)

NAME
faxanswer - tell a HylaFAX server to answer the telephone SYNOPSIS
/usr/sbin/faxanswer [ -q queue-dir ] [ -h how ] modem DESCRIPTION
faxanswer sends a message to the HylaFAX faxgetty(8C) process servicing modem telling it to answer the telephone. This is useful, for example, when a modem is used on a shared phone line and the server is configured to not normally answer the phone. The specified modem can either be the name (typically the last component of the terminal port the modem is attached to), or the full name of the associated FIFO named pipe file, e.g. ``FIFO.ttym2''. OPTIONS
-q dir Use a spooling area other than /var/spool/fax. -h Specify exactly how the phone should be answered. By default, the server process is instructed to answer the phone and accept any kind of call (voice, data, fax). Discrimination of the type of call is dependent on a modem's adaptive-answer support. The -h option can be used to force the server to answer the phone for particular type of call: one of fax, data, voice, any, extern (to force faxgetty to invoke an external application to to handle the call), or dialX (where X is a dialstring to dial before initiating a fax reception). If using dialX, the specified dialstring will likely need to end with a semicolon (``;''). FILES
/var/spool/fax default spooling area /var/spool/fax/FIFO fifo for contacting faxq Consult hylafax-server(5F) for a complete discussion of the structure and content of the spooling area. SEE ALSO
hylafax-server(5F), faxgetty(8C) May 23, 1996 FAXANSWER(8C)
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