默认标记选项获取操作

Question

如果有人运行-9并且在标志之后没有为OPTARG放置任何东西，我想让ops默认为-8标志。或者我可以检查OPTARG是否为空并用基值替换空值。

ft1和ftx只是格式化函数。

当我运行我的goat -8时，它打印出有问题的文件

当我运行goat -9 SEARCH STRING时，它打印的文件只包含该搜索字符串的结果。

如果我运行goat -9并且不放置搜索字符串它什么都不做因为OPTARG是空白的所以grep没有什么可搜索的。

如果用户在-9之后没有输入字符串，我希望能够将-8更改为goat -9。

    function goat() {
        local OPTIND
        local OPTARG
            if [ "$1" = "" ] ;
            then ft1 ;
            printf "

        This command requires an OPTION. Refer to the help menu (-h) for assistance.

    " | layoutcc
    ft1 ;
    fi

    while getopts ":h89:" opt;
    do case $opt in 

     8) for file in analysis/connection_history.txt ; do ftx $file | layoutcc ; 
                printf "%s" "$(<$file)"                                                    
                echo ;
                ft1 ;
                done 
    ;;

    9) grep_expr=$OPTARG

       for file in analysis/connection_history.txt ; do
            ftx "$file" | layoutcc
            grep "$grep_expr" $file | perl -ne 'print if /-201[8-9]/' | 
            perl -pe 's/......-2019/\e[1;32m$&\e[0m/g' 
                echo
                ft1
                done 
                ;;

function ft1
{
printf '%*s\n' "${COLUMNS:-$(tput cols)}" '' | tr ' ' = 
}   

function ft2
{
ft1 ;
ft1
}

function ftx
{ 
ft1 ;
echo "                         File Name: $1    $(grep -h "Created on" *-Report.txt | head -n1)" 
ft1
}       

function fsx
{
ft1 ;
echo "                         File Name: $1"
ft1
}

Answer 1

我会从解析代码的选项中获取业务逻辑：

grep_expr=""
has_8=false
has_9=false

while getopts ":h89:" opt; do
    case $opt in 
        h) do_some_h_thing ;;
        8) has_8=true ;;
        9) has_9=true; grep_expr=$OPTARG ;;
        :) echo "Error: missing argument for option -$OPTARG" >&2; exit 1 ;;
        *) echo "Error: unknown option -$OPTARG" >&2; exit 1 ;;
     esac
done
shift $((OPTIND - 1))

if $has_8 || ($has_9 && [[ -z $grep_expr ]]); then
    for file in analysis/connection_history.txt ; do
        ftx $file | layoutcc
        printf "%s" "$(<$file)"   # why not `cat "$file"` ?                                                    
        echo ;                    #
        ft1 ;
    done 
elif $has_9; then
   for file in analysis/connection_history.txt ; do
        ftx "$file" | layoutcc
        # following pipeline can be greatly simplified
        grep "$grep_expr" $file |
          perl -ne 'print if /-201[8-9]/' | 
          perl -pe 's/......-2019/\e[1;32m$&\e[0m/g' 
        echo
        ft1
    done 
 else
    echo "Error: you must use one of '-8' or '-9 basic_regex'" >&2
    exit 1
fi