Mdthbs

Are there any official mechanics for grafts or anything similar?

Defining and changing unknown CRS into WGS84

Reduction of carbamate with LAH

How to write Hanief (my name) in Japanese?

Does the Creighton Method of Natural Family Planning have a failure rate of 3.2% or less?

What is the meaning of "log" in this sentence?

grep pairs of patterns and file

Where can I find a blank outline of Silk Road routes?

How do I break the broom in Untitled Goose Game?

Can I perform Umrah while on a Saudi Arabian visit e-visa

Can I use I2C over 2m cables?

D&D Monsters and Copyright

Would my post-apocalyptic US Government be able to work and function properly?

Is it fine to ask this kind of question to the corresponding author of a paper?

In Men at Arms, why announce Edward was caught?

Why not build an "approximate" Analytical Engine before the complete one?

Solving a Certainty Equivalent (Decision Analysis) problem

Meaning of A-infinity relations

Why do English transliterations of Arabic names have so many Qs in them?

Modern warfare theory in a medieval setting

Can I color text by using an image, so that the color isn't flat?

Can massive damage kill you while at 0 HP?

'Cheddar goes "good" with burgers?' Can "go" be seen as a verb of the senses?

Can you be promoted and then fired for-cause? (Performance)

How can we check whether the user input equal to one elements of an array?

Command substitiution problem, confusedBash reading array in different formatbash: populating array with elements containing spaces and special charactersHow to hide stderr without “muting” user inputprocessing arguments with bash functionHow I can count how many repeated numbers in a file and then organize them by repetitions?Using user input to determine how many times a for loop iteratesModify a list: filter it, and rearrange the values in the resultMatching two files and keeping blocks that contain the matchHow to get bash file to echo differently based on user input?

.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{
margin-bottom:0;
}

1

Imagine we have an array like this:

declare -a array=( "one" "two" "three" "four" "five" )



for i in "${all[@]}"; do

        echo "$i"

done

And we can give an input from the user like this:

read -p "Enter a number: " number

I need something to check if the user input matches one of the elements of this array. If not, this should run:

echo "Try again: " 

This process should be repeated until the user input matches to one of the array elements.

bash

share|improve this question

edited 7 hours ago

user3140225

2,24688 silver badges2222 bronze badges

asked 8 hours ago

msndmmsndm

822 bronze badges

New contributor

msndm is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Is this a homework project?
  
  – Graham
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  No. I just tried many ways but as I'm new learner I did not find a good way.
  
  – msndm
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  
  this reads very similar to a homwork problem... What have you tried so far? Have you gotten any errors? Or are you just asking for a handout?
  
  – j-money
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  stackexchange.com/filters/169 might be a better place for this question if its not about Ubuntu.
  
  – Graham
  8 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I used it but doesn't work
  
  – msndm
  8 hours ago
  

  
  
  
  

 | 
show 2 more comments

1

Imagine we have an array like this:

declare -a array=( "one" "two" "three" "four" "five" )



for i in "${all[@]}"; do

        echo "$i"

done

And we can give an input from the user like this:

read -p "Enter a number: " number

I need something to check if the user input matches one of the elements of this array. If not, this should run:

echo "Try again: " 

This process should be repeated until the user input matches to one of the array elements.

bash

share|improve this question

edited 7 hours ago

user3140225

2,24688 silver badges2222 bronze badges

asked 8 hours ago

msndmmsndm

822 bronze badges

New contributor

msndm is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Is this a homework project?
  
  – Graham
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  No. I just tried many ways but as I'm new learner I did not find a good way.
  
  – msndm
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  
  this reads very similar to a homwork problem... What have you tried so far? Have you gotten any errors? Or are you just asking for a handout?
  
  – j-money
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  stackexchange.com/filters/169 might be a better place for this question if its not about Ubuntu.
  
  – Graham
  8 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I used it but doesn't work
  
  – msndm
  8 hours ago
  

  
  
  
  

 | 
show 2 more comments

Imagine we have an array like this:

declare -a array=( "one" "two" "three" "four" "five" )



for i in "${all[@]}"; do

        echo "$i"

done

And we can give an input from the user like this:

read -p "Enter a number: " number

I need something to check if the user input matches one of the elements of this array. If not, this should run:

echo "Try again: " 

This process should be repeated until the user input matches to one of the array elements.

bash

share|improve this question

edited 7 hours ago

user3140225

2,24688 silver badges2222 bronze badges

asked 8 hours ago

msndmmsndm

822 bronze badges

New contributor

msndm is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

declare -a array=( "one" "two" "three" "four" "five" )



for i in "${all[@]}"; do

        echo "$i"

done

read -p "Enter a number: " number

echo "Try again: " 

share|improve this question

edited 7 hours ago

user3140225

2,24688 silver badges2222 bronze badges

asked 8 hours ago

msndmmsndm

822 bronze badges

New contributor

msndm is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

edited 7 hours ago

user3140225

2,24688 silver badges2222 bronze badges

asked 8 hours ago

msndmmsndm

822 bronze badges

New contributor

msndm is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

edited 7 hours ago

user3140225

2,24688 silver badges2222 bronze badges

edited 7 hours ago

user3140225

2,24688 silver badges2222 bronze badges

asked 8 hours ago

msndmmsndm

822 bronze badges

New contributor

msndm is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 8 hours ago

msndmmsndm

822 bronze badges

4 Answers
4

active

oldest

votes

2

You do not need to loop over the array to check whether a value belongs to it. Also, in this case I would use a recursive call of a function instead of another loop. As I understand correctly you are searching for something like this:

#!/bin/bash



array=( "one" "two" "three" "four" "five" )



function get_input() {

    read -p "${1}: " number

    if [[ " ${array[*]} " == *" ${number} "* ]]

    then

        echo 'true';

    else

        get_input 'Try again'   # a recursive call of the function

    fi

}



get_input 'Enter a number'      # the initial call of the function

With the [[ test command we searing for exact match == between one string (the left side) and one regular expression (the right side).

• The expression " ${array[*]} " will expand our array as a string, surrounded by two spaces, thus each element (even the first and the last) will be surrounded by spaces - try echo '^'" ${array[*]} "'$'.




• The regular expression *" ${number} "* will match to any strung that consist of the value of the variable $number, surrounded by spaces, surrounded by no mater what other characters *.

We can perform such test by some other tools like grep (with suppressed stdout -q, and searching for exact match <...>). Here is one funny version:

#!/bin/bash



array=( "one" "two" "three" "four" "five" )



function get_input() {

    read -p "${1}: " nm

    echo "${array[*]}" | grep -q "<${nm}>" && echo 'true' || get_input 'Try again'

}



get_input "Enter a number"

share|improve this answer

edited 2 hours ago

answered 7 hours ago

pa4080pa4080

17.6k77 gold badges3636 silver badges8383 bronze badges

add a comment
 | 

2

Probably all the other answers are more efficient than this one, but I think that this is more beginner-friendly:

declare -a all=( "one" "two" "three" "four" "five" )



read -p "Enter a number: " number



while true; do



    for i in "${all[@]}"; do

        if [[ "$number" = "$i" ]]; then

            exit 0

        fi

    done



    read -p "Try again: " number



done

share|improve this answer

answered 7 hours ago

user3140225user3140225

2,24688 silver badges2222 bronze badges

add a comment
 | 

2

You can make the array into an associative array instead.

#!/bin/bash



declare -A array=([one]=1 [two]=1 [tree]=1 [four]=1 [five]=1)



m="Guess? "



while true; do   

    read -r -p "$m" i

    [[ ${array[$i]} == 1 ]] && break || m="Guess again? "

done  



echo "Good guess!"

share|improve this answer

edited 7 hours ago

answered 7 hours ago

bac0nbac0n

37366 bronze badges

add a comment
 | 

1

#!/bin/bash



declare -a array=("one" "two" "three" "four" "five")



number="wrong"



while [[ ! "${array[@]}" =~ "${number}" ]]; do

  [[ "${number}" != "wrong" ]] && echo "Incorrect"

  read -p "Insert number: " number

done

share|improve this answer

answered 7 hours ago

guillermo chamorroguillermo chamorro

75811 silver badge1313 bronze badges

add a comment
 | 

Your Answer

StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "89"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);

StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});

function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/4.0/"u003ecc by-sa 4.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});


}
});

msndm is a new contributor. Be nice, and check out our Code of Conduct.

draft saved

draft discarded

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Sign up using Google

Sign up using Facebook

Sign up using Email and Password

Post as a guest

Name

Email

Required, but never shown

StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2faskubuntu.com%2fquestions%2f1177947%2fhow-can-we-check-whether-the-user-input-equal-to-one-elements-of-an-array%23new-answer', 'question_page');
}
);

Post as a guest

Name

Email

Required, but never shown

2

You do not need to loop over the array to check whether a value belongs to it. Also, in this case I would use a recursive call of a function instead of another loop. As I understand correctly you are searching for something like this:

#!/bin/bash



array=( "one" "two" "three" "four" "five" )



function get_input() {

    read -p "${1}: " number

    if [[ " ${array[*]} " == *" ${number} "* ]]

    then

        echo 'true';

    else

        get_input 'Try again'   # a recursive call of the function

    fi

}



get_input 'Enter a number'      # the initial call of the function

With the [[ test command we searing for exact match == between one string (the left side) and one regular expression (the right side).

• The expression " ${array[*]} " will expand our array as a string, surrounded by two spaces, thus each element (even the first and the last) will be surrounded by spaces - try echo '^'" ${array[*]} "'$'.




• The regular expression *" ${number} "* will match to any strung that consist of the value of the variable $number, surrounded by spaces, surrounded by no mater what other characters *.

We can perform such test by some other tools like grep (with suppressed stdout -q, and searching for exact match <...>). Here is one funny version:

#!/bin/bash



array=( "one" "two" "three" "four" "five" )



function get_input() {

    read -p "${1}: " nm

    echo "${array[*]}" | grep -q "<${nm}>" && echo 'true' || get_input 'Try again'

}



get_input "Enter a number"

share|improve this answer

edited 2 hours ago

answered 7 hours ago

pa4080pa4080

17.6k77 gold badges3636 silver badges8383 bronze badges

add a comment
 | 

2

You do not need to loop over the array to check whether a value belongs to it. Also, in this case I would use a recursive call of a function instead of another loop. As I understand correctly you are searching for something like this:

#!/bin/bash



array=( "one" "two" "three" "four" "five" )



function get_input() {

    read -p "${1}: " number

    if [[ " ${array[*]} " == *" ${number} "* ]]

    then

        echo 'true';

    else

        get_input 'Try again'   # a recursive call of the function

    fi

}



get_input 'Enter a number'      # the initial call of the function

With the [[ test command we searing for exact match == between one string (the left side) and one regular expression (the right side).

• The expression " ${array[*]} " will expand our array as a string, surrounded by two spaces, thus each element (even the first and the last) will be surrounded by spaces - try echo '^'" ${array[*]} "'$'.




• The regular expression *" ${number} "* will match to any strung that consist of the value of the variable $number, surrounded by spaces, surrounded by no mater what other characters *.

We can perform such test by some other tools like grep (with suppressed stdout -q, and searching for exact match <...>). Here is one funny version:

#!/bin/bash



array=( "one" "two" "three" "four" "five" )



function get_input() {

    read -p "${1}: " nm

    echo "${array[*]}" | grep -q "<${nm}>" && echo 'true' || get_input 'Try again'

}



get_input "Enter a number"

share|improve this answer

edited 2 hours ago

answered 7 hours ago

pa4080pa4080

17.6k77 gold badges3636 silver badges8383 bronze badges

add a comment
 | 

You do not need to loop over the array to check whether a value belongs to it. Also, in this case I would use a recursive call of a function instead of another loop. As I understand correctly you are searching for something like this:

#!/bin/bash



array=( "one" "two" "three" "four" "five" )



function get_input() {

    read -p "${1}: " number

    if [[ " ${array[*]} " == *" ${number} "* ]]

    then

        echo 'true';

    else

        get_input 'Try again'   # a recursive call of the function

    fi

}



get_input 'Enter a number'      # the initial call of the function

With the [[ test command we searing for exact match == between one string (the left side) and one regular expression (the right side).

• The expression " ${array[*]} " will expand our array as a string, surrounded by two spaces, thus each element (even the first and the last) will be surrounded by spaces - try echo '^'" ${array[*]} "'$'.




• The regular expression *" ${number} "* will match to any strung that consist of the value of the variable $number, surrounded by spaces, surrounded by no mater what other characters *.

We can perform such test by some other tools like grep (with suppressed stdout -q, and searching for exact match <...>). Here is one funny version:

#!/bin/bash



array=( "one" "two" "three" "four" "five" )



function get_input() {

    read -p "${1}: " nm

    echo "${array[*]}" | grep -q "<${nm}>" && echo 'true' || get_input 'Try again'

}



get_input "Enter a number"

share|improve this answer

edited 2 hours ago

answered 7 hours ago

pa4080pa4080

17.6k77 gold badges3636 silver badges8383 bronze badges

#!/bin/bash



array=( "one" "two" "three" "four" "five" )



function get_input() {

    read -p "${1}: " number

    if [[ " ${array[*]} " == *" ${number} "* ]]

    then

        echo 'true';

    else

        get_input 'Try again'   # a recursive call of the function

    fi

}



get_input 'Enter a number'      # the initial call of the function

#!/bin/bash



array=( "one" "two" "three" "four" "five" )



function get_input() {

    read -p "${1}: " nm

    echo "${array[*]}" | grep -q "<${nm}>" && echo 'true' || get_input 'Try again'

}



get_input "Enter a number"

share|improve this answer

edited 2 hours ago

answered 7 hours ago

pa4080pa4080

17.6k77 gold badges3636 silver badges8383 bronze badges

answered 7 hours ago

pa4080pa4080

17.6k77 gold badges3636 silver badges8383 bronze badges

answered 7 hours ago

pa4080pa4080

17.6k77 gold badges3636 silver badges8383 bronze badges

2

Probably all the other answers are more efficient than this one, but I think that this is more beginner-friendly:

declare -a all=( "one" "two" "three" "four" "five" )



read -p "Enter a number: " number



while true; do



    for i in "${all[@]}"; do

        if [[ "$number" = "$i" ]]; then

            exit 0

        fi

    done



    read -p "Try again: " number



done

share|improve this answer

answered 7 hours ago

user3140225user3140225

2,24688 silver badges2222 bronze badges

add a comment
 | 

2

Probably all the other answers are more efficient than this one, but I think that this is more beginner-friendly:

declare -a all=( "one" "two" "three" "four" "five" )



read -p "Enter a number: " number



while true; do



    for i in "${all[@]}"; do

        if [[ "$number" = "$i" ]]; then

            exit 0

        fi

    done



    read -p "Try again: " number



done

share|improve this answer

answered 7 hours ago

user3140225user3140225

2,24688 silver badges2222 bronze badges

add a comment
 | 

Probably all the other answers are more efficient than this one, but I think that this is more beginner-friendly:

declare -a all=( "one" "two" "three" "four" "five" )



read -p "Enter a number: " number



while true; do



    for i in "${all[@]}"; do

        if [[ "$number" = "$i" ]]; then

            exit 0

        fi

    done



    read -p "Try again: " number



done

share|improve this answer

answered 7 hours ago

user3140225user3140225

2,24688 silver badges2222 bronze badges

declare -a all=( "one" "two" "three" "four" "five" )



read -p "Enter a number: " number



while true; do



    for i in "${all[@]}"; do

        if [[ "$number" = "$i" ]]; then

            exit 0

        fi

    done



    read -p "Try again: " number



done

share|improve this answer

answered 7 hours ago

user3140225user3140225

2,24688 silver badges2222 bronze badges

answered 7 hours ago

user3140225user3140225

2,24688 silver badges2222 bronze badges

answered 7 hours ago

user3140225user3140225

2,24688 silver badges2222 bronze badges

2

You can make the array into an associative array instead.

#!/bin/bash



declare -A array=([one]=1 [two]=1 [tree]=1 [four]=1 [five]=1)



m="Guess? "



while true; do   

    read -r -p "$m" i

    [[ ${array[$i]} == 1 ]] && break || m="Guess again? "

done  



echo "Good guess!"

share|improve this answer

edited 7 hours ago

answered 7 hours ago

bac0nbac0n

37366 bronze badges

add a comment
 | 

2

You can make the array into an associative array instead.

#!/bin/bash



declare -A array=([one]=1 [two]=1 [tree]=1 [four]=1 [five]=1)



m="Guess? "



while true; do   

    read -r -p "$m" i

    [[ ${array[$i]} == 1 ]] && break || m="Guess again? "

done  



echo "Good guess!"

share|improve this answer

edited 7 hours ago

answered 7 hours ago

bac0nbac0n

37366 bronze badges

add a comment
 | 

You can make the array into an associative array instead.

#!/bin/bash



declare -A array=([one]=1 [two]=1 [tree]=1 [four]=1 [five]=1)



m="Guess? "



while true; do   

    read -r -p "$m" i

    [[ ${array[$i]} == 1 ]] && break || m="Guess again? "

done  



echo "Good guess!"

share|improve this answer

edited 7 hours ago

answered 7 hours ago

bac0nbac0n

37366 bronze badges

#!/bin/bash



declare -A array=([one]=1 [two]=1 [tree]=1 [four]=1 [five]=1)



m="Guess? "



while true; do   

    read -r -p "$m" i

    [[ ${array[$i]} == 1 ]] && break || m="Guess again? "

done  



echo "Good guess!"

share|improve this answer

edited 7 hours ago

answered 7 hours ago

bac0nbac0n

37366 bronze badges

answered 7 hours ago

bac0nbac0n

37366 bronze badges

answered 7 hours ago

bac0nbac0n

37366 bronze badges

1

#!/bin/bash



declare -a array=("one" "two" "three" "four" "five")



number="wrong"



while [[ ! "${array[@]}" =~ "${number}" ]]; do

  [[ "${number}" != "wrong" ]] && echo "Incorrect"

  read -p "Insert number: " number

done

share|improve this answer

answered 7 hours ago

guillermo chamorroguillermo chamorro

75811 silver badge1313 bronze badges

add a comment
 | 

1

#!/bin/bash



declare -a array=("one" "two" "three" "four" "five")



number="wrong"



while [[ ! "${array[@]}" =~ "${number}" ]]; do

  [[ "${number}" != "wrong" ]] && echo "Incorrect"

  read -p "Insert number: " number

done

share|improve this answer

answered 7 hours ago

guillermo chamorroguillermo chamorro

75811 silver badge1313 bronze badges

add a comment
 | 

#!/bin/bash



declare -a array=("one" "two" "three" "four" "five")



number="wrong"



while [[ ! "${array[@]}" =~ "${number}" ]]; do

  [[ "${number}" != "wrong" ]] && echo "Incorrect"

  read -p "Insert number: " number

done

share|improve this answer

answered 7 hours ago

guillermo chamorroguillermo chamorro

75811 silver badge1313 bronze badges

#!/bin/bash



declare -a array=("one" "two" "three" "four" "five")



number="wrong"



while [[ ! "${array[@]}" =~ "${number}" ]]; do

  [[ "${number}" != "wrong" ]] && echo "Incorrect"

  read -p "Insert number: " number

done

share|improve this answer

answered 7 hours ago

guillermo chamorroguillermo chamorro

75811 silver badge1313 bronze badges

answered 7 hours ago

guillermo chamorroguillermo chamorro

75811 silver badge1313 bronze badges

answered 7 hours ago

guillermo chamorroguillermo chamorro

75811 silver badge1313 bronze badges