I'm started learning shell scripting, and I'm trying to figure out a way to add an option that returns the user back to the menu. for example:

5) echo "Return to the menu"
   echo "Return back to the menu? ";;

Hear is the script on hand:

echo "1. I'm number one"
echo "2. I'm number two"
echo "3. I'm number three"

echo "4. Exit from menu "

echo -n "Enter one the following numbers:"

while :
do

read choice

case $choice in

  1)  echo "You have selected the number one"
      echo "Selected number is one";;

  2)  echo "You have selected the number two"
      echo "Selected number is two";;

  3)  echo "You have selected the number three"
      echo "Selected number is three";;    

  4)  echo "Exiting after the information have been received by both devices" # Referring to the TCP/IP protocol. The information has to be established by both client and device to act like a server before data is sent. Ok I'm showing of here :)
      exit;


  
esac
  echo -n "Enter one of the four options"
done # Sorry if there are errors in the this code, I wrote it on the fly :)

CodePudding user response：

You can also use select to create a menu

#! /bin/bash

opts=( "I'm number one" "I'm number two" "I'm number three" "Exit from menu" )
PS3="Enter one the following numbers:"
select o in "${opts[@]}"
do
    case "$REPLY" in
        1)  echo "You have selected the number one: $o"
            echo "Selected number is one";;

        2)  echo "You have selected the number two: $o"
            echo "Selected number is two";;

        3)  echo "You have selected the number three: $o"
            echo "Selected number is three";;    

        4)  echo "Exiting after the information have been received by both devices" # Referring to the TCP/IP protocol. The information has to be established by both client and device to act like a server before data is sent. Ok I'm showing of here :)
            exit;;
    esac
done

CodePudding user response：

To add a return to menu feature, try this: Add a variable accessMenu, set it to true, and update the while loop condition as so, and set accessMenu to false first thing in the loop...

accessMenu=true
while [[ $accessMenu -eq true ]]; do
    accessMenu=false
    ... (code)
done

Lastly, in the case that you want to enable returning to the menu, set the variable to true, and it will pass the condition in the while loop to run again.

CodePudding user response：

I recently made a function that does this, all you need to do is break to return to the previous function

https://stackoverflow.com/a/74793424/793088

selectVideoAction() {
    # Needed so listVideoActions can do a check to see if a 5 was the
    # last $REPLY before a 6
    [ "$REPLY" != 6 ] && lReply="$REPLY"

    [ $allSelected -eq 1 ] && PS3="Select an action($lAction): "\
                           || PS3="Select an action: "
    printf "\n"

    [ "$REPLY" = 2 ] && displayVideoInformation "$1" && lAction=$REPLY
    [ "$REPLY" = 3 ] && searchNameOpensubtitles "$1" && lAction=$REPLY
    [ "$REPLY" = 4 ] && searchHashOpensubtitles "$1" && lAction=$REPLY
}

listVideoActions() {
    local actions=("Go back to video selection")            # 1
    actions =("Show video information")                     # 2 repeatable
    actions =("Search name on opensubtitles")               # 3 repeatable
    actions =("Search hash on opensubtitles")               # 4 repeatable
    [ $allSelected -eq 1 ] && actions =("Next video")      `# 5` \
    && actions =("Repeat last action on remaining files");  # 6
    actions =("Quit")                                       # 5 or 7

    printf "${BBlue}$2${Color_Off}\n"
    [ $allSelected -eq 1 ] && PS3="Select an action($lAction): "\
                           || PS3="Select an action: "

    if [ $repeatLast -eq 0 ]; then
        select action in "${actions[@]}"; do
            selectVideoAction "$1"

            if   [ "$REPLY" = 1 ]; then allSelected=0; break;
            elif [ "$REPLY" = 5 ]  && [ $allSelected -eq 1 ]; then break
            elif [ "$REPLY" = 5 ]  && [ $allSelected -eq 0 ]; then exit 1
            elif [ "$REPLY" = 6 ]  && [ $allSelected -eq 1 ]; then
                # Check that a repeatable action has previously been selected
                if [ ! -z "$lAction" ]; then
                    # If the previous action $REPLY was to go to the next video
                    # then the repeatable action needs to be run before going
                    # to the next video
                    [ "$lReply" = 5 ] && REPLY=$lAction && selectVideoAction "$1"

                    repeatLast=1
                    break
                fi
                PS3="No last action. Select an action($lAction): "
            elif [ "$REPLY" = 7 ]  && [ $allSelected -eq 1 ]; then exit 1; fi
        done
    elif [ $repeatLast -eq 1 ]; then
        # Run the last repeatable action automatically for every remaining video
        sleep 2 | yes "$lAction" | select action in "${actions[@]}"; do
            selectVideoAction "$1"
            break
        done
    fi
}

listVideos() {
    local lReply=""       # The last action $REPLY
    local lAction=""      # The last repeatable action $REPLY 2, 3 or 4
    local repeatLast=0    # When set to 1 $lAction is automatically repeated
    local allSelected=0   # When set to 1 all videos have been selected
    local options=("${videos[@]}")  
          options =("Select All")
    local numOptions=$((${#options[@]}))
    PS3="Select a video: "

    select file in "${options[@]##*/}"; do
        # Strip all spaces so arithmetic(( )) comparison doesn't fail
        REPLY=$(echo "$REPLY" | tr -d ' ')
        printf "\n"

        if [ "$REPLY" = "$numOptions" ]; then
            allSelected=1
            local video

            for video in "${videos[@]}"; do
                listVideoActions "$video" "${video##*/}"
                # The action $REPLY 1 was selected to return to the video list 
                [ $allSelected -eq 0 ] && break
            done
            break
        elif (( "$REPLY" > 0 && "$REPLY" < "$numOptions" )); then
            listVideoActions "${videos[$REPLY-1]}" "${videos[$REPLY-1]##*/}"
            break
        fi
    done
    listVideos
}