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Top Forums Shell Programming and Scripting Change existing variable value only user enters non-empty string. Post 302422979 by alister on Wednesday 19th of May 2010 11:55:40 PM
Old 05-20-2010
You can simply use the following parameter expansion which returns $resp if it's not null or $uid otherwise:
Code:
uid=${resp:-$uid}

Regards,
Alister
 

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RABBITMQ-ENV.CONF(5)						  RabbitMQ Server					      RABBITMQ-ENV.CONF(5)

NAME
rabbitmq-env.conf - default settings for RabbitMQ AMQP server DESCRIPTION
/etc/rabbitmq/rabbitmq-env.conf contains variable settings that override the defaults built in to the RabbitMQ startup scripts. The file is interpreted by the system shell, and so should consist of a sequence of shell environment variable definitions. Normal shell syntax is permitted (since the file is sourced using the shell "." operator), including line comments starting with "#". In order of preference, the startup scripts get their values from the environment, from /etc/rabbitmq/rabbitmq-env.conf and finally from the built-in default values. For example, for the RABBITMQ_NODENAME setting, RABBITMQ_NODENAME from the environment is checked first. If it is absent or equal to the empty string, then NODENAME from /etc/rabbitmq/rabbitmq-env.conf is checked. If it is also absent or set equal to the empty string then the default value from the startup script is used. The variable names in /etc/rabbitmq/rabbitmq-env.conf are always equal to the environment variable names, with the RABBITMQ_ prefix removed: RABBITMQ_NODE_PORT from the environment becomes NODE_PORT in the /etc/rabbitmq/rabbitmq-env.conf file, etc. # I am a complete /etc/rabbitmq/rabbitmq-env.conf file. # Comment lines start with a hash character. # This is a /bin/sh script file - use ordinary envt var syntax NODENAME=hare SEE ALSO
rabbitmq-server(1) rabbitmqctl(1) EXAMPLES
# I am a complete /etc/rabbitmq/rabbitmq-env.conf file. # Comment lines start with a hash character. # This is a /bin/sh script file - use ordinary envt var syntax NODENAME=hare This is an example of a complete /etc/rabbitmq/rabbitmq-env.conf file that overrides the default Erlang node name from "rabbit" to "hare". AUTHOR
The RabbitMQ Team <info@rabbitmq.com> RabbitMQ Server 06/22/2012 RABBITMQ-ENV.CONF(5)
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