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Stumped .. is this a command line arg?

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linux-howto

http://www.unix.com – I need a bit of explanation: Code: LogFile=${LOGS_DIR}/${1}_$$ I know: - LOGS_DIR is an environment variable - $$ is the PID ... but what is ${1} ?? Is it another method to access a command line variable, or the job name? Thanks! Jon (HowTos)