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Need help on the shell script

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linux-howto

http://www.unix.com – Hi all, Im a newbie to Unixshell script .Please explain me what this below shell script does and assistance with me a description Code: ################################ #  CODE                # ################################ if [[ $# -ne 4 ]] then     echo "Usage: $(basename $0) \$SS_APPL \$SS_DB \$S_U_PATH \$SS_HOME_PATH"     MESSAGE="Invalid number of input parameters"     ERROR_CODE=1 else   export CURR_YEAR=`date +%Y`   export CURR_DATE=`date +%d%b%Y_%H%M%S`   export (HowTos)