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Accepted
Adam Ledger
Asked: 2019-02-18 04:10:56 +0800 CST

Bash scripts and defining variables

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when i launch my bash script:

$ ./mybashscript.sh

How do I define variables with in it if i want to be able to append values for them in the execution of the above command? ie, how do i declare variables day,month and year in my .sh file if i were using it to record an entry, 

$ ./EventDateLog.sh -day=17 -month=2 year=2019
scripts bash

1 Answers

  1. Best Answer

    If you are ok with short name variables the easiest way I see would be using getopts like this:

    #!/bin/bash

while getopts :d:m:y: FLAG; do case $FLAG in

    d) # set day
      DAY=$OPTARG
      ;;

    m) # set month
      MONTH=$OPTARG
      ;;

    y) # set year
      YEAR=$OPTARG
      ;;

    \?) # unrecognized option - show help
    echo "your help message here"
    exit 0
      ;;   

 esac
done


# the rest of your program here handling your variables
echo "$DAY" "$MONTH "$YEAR"

    Example

    $ ./EventDateLog.sh -d 17 -m 2 -y 2019
17 2 2019
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