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The shell script doesn't get arguments, but parse them

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# 1  
Old 07-25-2017
The shell script doesn't get arguments, but parse them
Hello,
I have a simple shell script, which starts from crontab like this:
Code:
 00 03 * * 2-6 /export/applications/dte/sh/fwmarg.sh > /export/applications/dte/data/cron_log/fwmarg.cronlog.`date +\%m.\%d` 2>&1

The script doesn't get any argument. But inside it I see the line
Code:
 parse_args $@

I don't understand, why it need to parse arguments, if it doesn't get any arguments when it starts from crontab?

Thanks for contribution
# 2  
Old 07-25-2017
We would have to see the actual parse_args function to give you a good answer. All of the scripts we run against our huge datasets have a common include shell script, i.e., another small script is sourced. Keeps our common modules easy to maintain - just look in only one place.

The argument parsing it does loops over available arguments. If none are present there are a few default values used. So it does not "care" if there are arguments or not.

So. This is what someone else does. What your script does, I do not know for sure.
# 3  
Old 07-25-2017
The script start Perl script with several arguments. The Perl script or cerate report or update database
below is parse_args function
Code:
 parse_args () {
        echo "VARVAR $#"
        if [ $# -gt 0 ]
        then
                export THREAD_ARG="$@"
                while [ ! -z "$1" ]
                do
                        case $1 in
                                -P* | -p* )
                                        export PROCESS_DATE=$2
                                        export MM=`echo $2 | cut -c5-6`
                                        export DD=`echo $2 | cut -c7-8`
                                        export YY=`echo $2 | cut -c3-4`
                                        export PROCESS_DATE_US_MMDDYY="$MM/$DD/$YY"
                                        shift
                                        ;;
                                -OUT* | -OUt* | -Out* | -out* | -oUT* | -ouT* |-oUt* )
                                        if [ -d $2 ]
                                        then
                                                export OUTPUT_DIR=$2
                                        fi
                                        shift
                                        ;;
                                -IN* | -In* | -in* | -iN* )
                                        if [ -d $2 ]
                                        then
                                                export INPUT_DIR=$2
                                        fi
                                        shift
                                        ;;
                                -LOG* | -LOg* | -Log* | -log* | -lOG* | -loG* |-lOg* )
                                       if [ -d $2 ]
                                        then
                                                export LOG_HOME=$2
                                        fi
                                        shift
                                        ;;
                                -COO* | -COo* | -Coo* | -coo* | -cOO* | -coO* |-cOo* )
                                        if [ -d $2 ]
                                        then
                                                export COOL_DIR=$2
                                        fi
                                        shift
                                        ;;
                                -CBD* | -CBd* | -Cbd* | -cbd* | -cBD* | -cbD* |-cBd* )
                                        COOLBDAY=$2
                                        shift
                                        ;;
                                -TES* | -TEs* | -Tes* | -tes* | -tES* | -teS* |-tEs* )
                                        TEST="Y"
                                       ;;
                                -RELOAD* | -RESEND* | -reload* | -resend* | -Reload* | -Resend* )
                                        RELOAD="Y"
                                        ;;
                                SERVERMODE* | servermode* | ServerMode* )
                                        tmpmode=`echo ${1} | awk -F'=' '{print ($2)}' | tr a-z A-Z`
                                        export SERVERMODE="${tmpmode}"
                                        ;;
                                DBENV* | dbenv* | DBenv* | DBEnv* )
                                        tmpmode=`echo ${1} | awk -F'=' '{print ($2)}' | tr a-z A-Z`
                                        export DBENV="${tmpmode}"
                                        if [ -f ${DTE_WORKING_DIR}/sh/oracle.env ]; then
                                                . ${DTE_WORKING_DIR}/sh/oracle.env
                                        fi
                                        ;;
                                -DB* | -db* | -Db* | -dB*)
                                        ORACLE_USER=$2
                                        shift
                                        ;;
                                -NOPAGE* | -Nopag* | -NOPag* | -nopage* )
                                        export PAGEMODE="OFF"
                                        ;;
                                -Userdata* | -USERDATA* | -Userdata* | -userdata* | -UserData* )
                                        export _USER_DATA=$2
                                        shift
                                        ;;
                                * )
                                        ;;
                        esac
                        shift
                done
        fi
}

Thanks for contribution
# 4  
Old 07-25-2017
It skips over the arguments -- if no arguments it just goes on. Now whether that is correct for job to run well, I cannot know. Your problem.

Code:
        echo "VARVAR $#"
        if [ $# -gt 0 ]
        then
          .. remove lots of code here 

       fi

$# is a count of command line arguments passed to the script.
This User Gave Thanks to jim mcnamara For This Post:
digioleg54
# 5  
Old 07-25-2017
ok, thanks
# 6  
Old 07-25-2017
Yikes!

Whoever wrote this has never heard of the getopts command or shell shell-built-in. Even if this (miraculously) works, you should replace it by a function using getopts.

UNIX (and systems alike like Linux) provides a parser for commandline parsing already and there is no need to replace that - and definitely not with one that works less reliable.

I hope this helps.

bakunin
# 7  
Old 07-25-2017
this is a very old shell program, which I convert to Perl. And as I said, there is no arguments shell script receives
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