Linux - Checking if user has entered numbers and letters
up vote
0
down vote
favorite
The script I am trying to create should ask the user to enter a password. This password will then be checked if it contains a capital, characters and numbers
This is all I have so far before I got lost and started googling for ways of doing this
#!/bin/sh
echo "Please enter a password containing numbers and letters"
read password
if [[password =~ [0-9] ]]
then
echo "Successful"
else
echo "Fail"
fi
linux shell-script
edited yesterday
SouravGhosh
371210
asked yesterday
ElonCode
84
New contributor
ElonCode is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
up vote
0
down vote
favorite
The script I am trying to create should ask the user to enter a password. This password will then be checked if it contains a capital, characters and numbers
This is all I have so far before I got lost and started googling for ways of doing this
#!/bin/sh
echo "Please enter a password containing numbers and letters"
read password
if [[password =~ [0-9] ]]
then
echo "Successful"
else
echo "Fail"
fi
linux shell-script
edited yesterday
SouravGhosh
371210
asked yesterday
ElonCode
84
New contributor
ElonCode is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Is your intent for it to require a number, uppercase, lowercase, and special character?
– Jesse_b
yesterday
@Jesse_b yes this is what I intend
– ElonCode
yesterday
add a comment |
up vote
0
down vote
favorite
up vote
0
down vote
favorite
The script I am trying to create should ask the user to enter a password. This password will then be checked if it contains a capital, characters and numbers
This is all I have so far before I got lost and started googling for ways of doing this
#!/bin/sh
echo "Please enter a password containing numbers and letters"
read password
if [[password =~ [0-9] ]]
then
echo "Successful"
else
echo "Fail"
fi
linux shell-script
edited yesterday
SouravGhosh
371210
asked yesterday
ElonCode
84
New contributor
ElonCode is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
The script I am trying to create should ask the user to enter a password. This password will then be checked if it contains a capital, characters and numbers
This is all I have so far before I got lost and started googling for ways of doing this
#!/bin/sh
echo "Please enter a password containing numbers and letters"
read password
if [[password =~ [0-9] ]]
then
echo "Successful"
else
echo "Fail"
fi
linux shell-script
linux shell-script
edited yesterday
SouravGhosh
371210
asked yesterday
ElonCode
84
New contributor
ElonCode is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited yesterday
SouravGhosh
371210
asked yesterday
ElonCode
84
New contributor
ElonCode is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited yesterday
SouravGhosh
371210
edited yesterday
SouravGhosh
371210
edited yesterday
SouravGhosh
371210
371210
asked yesterday
ElonCode
84
New contributor
ElonCode is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked yesterday
ElonCode
84
asked yesterday
ElonCode
84
84
New contributor
ElonCode is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
ElonCode is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
ElonCode is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Is your intent for it to require a number, uppercase, lowercase, and special character?
– Jesse_b
yesterday
@Jesse_b yes this is what I intend
– ElonCode
yesterday
add a comment |
Is your intent for it to require a number, uppercase, lowercase, and special character?
– Jesse_b
yesterday
@Jesse_b yes this is what I intend
– ElonCode
yesterday
Is your intent for it to require a number, uppercase, lowercase, and special character?
– Jesse_b
yesterday
Is your intent for it to require a number, uppercase, lowercase, and special character?
– Jesse_b
yesterday
@Jesse_b yes this is what I intend
– ElonCode
yesterday
@Jesse_b yes this is what I intend
– ElonCode
yesterday
add a comment |
1 Answer
1
active
oldest
votes
up vote
2
down vote
Some issues with your code:
- You need a space between
[[andpassword
passwordwill be a variable and therefore needs to be written as$passwordto expand- You are using the
#!/bin/shhashbang and therefore the bash extended test ([[) may not be available - You are only checking if the password contains numbers
I think a function would be best for checking if the password meets your requirements and have come up with the following:
#!/bin/sh
chk_pass () {
local pass=$1
# Check if password contains uppercase
printf '%s' "$pass" | grep -q '[A-Z]' || return 1
# Check if password contains lowercase
printf '%s' "$pass" | grep -q '[a-z]' || return 1
# Check if password contains numbers
printf '%s' "$pass" | grep -q '[0-9]' || return 1
# Check if password contains special characters
printf '%s' "$pass" | grep -q '[^a-zA-Z0-9 t]' || return 1
return 0
}
printf '%sn' 'Please enter a password containing at least one number, one uppercase letter, one lowercase letter, and one special character: '
read -rs
if chk_pass "$REPLY"; then
printf '%sn' 'Success'
else
printf '%sn' 'Error: Password must contain one number, one uppercase letter, one lowercase letter, and one special character!' >&2
fi
Notes:
The last grep in the function actually only checks that the password contains characters other than alphanumeric or whitespace.
The -r option for read will preserve backslash characters
The -s option for read will hide user input (useful for password input)
answered yesterday
Jesse_b
11.7k23063
add a comment |
Your Answer
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "106"
};
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',
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
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/3.0/"u003ecc by-sa 3.0 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
});
}
});
ElonCode is a new contributor. Be nice, and check out our Code of Conduct.
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
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f487974%2flinux-checking-if-user-has-entered-numbers-and-letters%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
2
down vote
Some issues with your code:
- You need a space between
[[andpassword
passwordwill be a variable and therefore needs to be written as$passwordto expand- You are using the
#!/bin/shhashbang and therefore the bash extended test ([[) may not be available - You are only checking if the password contains numbers
I think a function would be best for checking if the password meets your requirements and have come up with the following:
#!/bin/sh
chk_pass () {
local pass=$1
# Check if password contains uppercase
printf '%s' "$pass" | grep -q '[A-Z]' || return 1
# Check if password contains lowercase
printf '%s' "$pass" | grep -q '[a-z]' || return 1
# Check if password contains numbers
printf '%s' "$pass" | grep -q '[0-9]' || return 1
# Check if password contains special characters
printf '%s' "$pass" | grep -q '[^a-zA-Z0-9 t]' || return 1
return 0
}
printf '%sn' 'Please enter a password containing at least one number, one uppercase letter, one lowercase letter, and one special character: '
read -rs
if chk_pass "$REPLY"; then
printf '%sn' 'Success'
else
printf '%sn' 'Error: Password must contain one number, one uppercase letter, one lowercase letter, and one special character!' >&2
fi
Notes:
The last grep in the function actually only checks that the password contains characters other than alphanumeric or whitespace.
The -r option for read will preserve backslash characters
The -s option for read will hide user input (useful for password input)
answered yesterday
Jesse_b
11.7k23063
add a comment |
up vote
2
down vote
Some issues with your code:
- You need a space between
[[andpassword
passwordwill be a variable and therefore needs to be written as$passwordto expand- You are using the
#!/bin/shhashbang and therefore the bash extended test ([[) may not be available - You are only checking if the password contains numbers
I think a function would be best for checking if the password meets your requirements and have come up with the following:
#!/bin/sh
chk_pass () {
local pass=$1
# Check if password contains uppercase
printf '%s' "$pass" | grep -q '[A-Z]' || return 1
# Check if password contains lowercase
printf '%s' "$pass" | grep -q '[a-z]' || return 1
# Check if password contains numbers
printf '%s' "$pass" | grep -q '[0-9]' || return 1
# Check if password contains special characters
printf '%s' "$pass" | grep -q '[^a-zA-Z0-9 t]' || return 1
return 0
}
printf '%sn' 'Please enter a password containing at least one number, one uppercase letter, one lowercase letter, and one special character: '
read -rs
if chk_pass "$REPLY"; then
printf '%sn' 'Success'
else
printf '%sn' 'Error: Password must contain one number, one uppercase letter, one lowercase letter, and one special character!' >&2
fi
Notes:
The last grep in the function actually only checks that the password contains characters other than alphanumeric or whitespace.
The -r option for read will preserve backslash characters
The -s option for read will hide user input (useful for password input)
answered yesterday
Jesse_b
11.7k23063
add a comment |
up vote
2
down vote
up vote
2
down vote
Some issues with your code:
- You need a space between
[[andpassword
passwordwill be a variable and therefore needs to be written as$passwordto expand- You are using the
#!/bin/shhashbang and therefore the bash extended test ([[) may not be available - You are only checking if the password contains numbers
I think a function would be best for checking if the password meets your requirements and have come up with the following:
#!/bin/sh
chk_pass () {
local pass=$1
# Check if password contains uppercase
printf '%s' "$pass" | grep -q '[A-Z]' || return 1
# Check if password contains lowercase
printf '%s' "$pass" | grep -q '[a-z]' || return 1
# Check if password contains numbers
printf '%s' "$pass" | grep -q '[0-9]' || return 1
# Check if password contains special characters
printf '%s' "$pass" | grep -q '[^a-zA-Z0-9 t]' || return 1
return 0
}
printf '%sn' 'Please enter a password containing at least one number, one uppercase letter, one lowercase letter, and one special character: '
read -rs
if chk_pass "$REPLY"; then
printf '%sn' 'Success'
else
printf '%sn' 'Error: Password must contain one number, one uppercase letter, one lowercase letter, and one special character!' >&2
fi
Notes:
The last grep in the function actually only checks that the password contains characters other than alphanumeric or whitespace.
The -r option for read will preserve backslash characters
The -s option for read will hide user input (useful for password input)
answered yesterday
Jesse_b
11.7k23063
Some issues with your code:
- You need a space between
[[andpassword
passwordwill be a variable and therefore needs to be written as$passwordto expand- You are using the
#!/bin/shhashbang and therefore the bash extended test ([[) may not be available - You are only checking if the password contains numbers
I think a function would be best for checking if the password meets your requirements and have come up with the following:
#!/bin/sh
chk_pass () {
local pass=$1
# Check if password contains uppercase
printf '%s' "$pass" | grep -q '[A-Z]' || return 1
# Check if password contains lowercase
printf '%s' "$pass" | grep -q '[a-z]' || return 1
# Check if password contains numbers
printf '%s' "$pass" | grep -q '[0-9]' || return 1
# Check if password contains special characters
printf '%s' "$pass" | grep -q '[^a-zA-Z0-9 t]' || return 1
return 0
}
printf '%sn' 'Please enter a password containing at least one number, one uppercase letter, one lowercase letter, and one special character: '
read -rs
if chk_pass "$REPLY"; then
printf '%sn' 'Success'
else
printf '%sn' 'Error: Password must contain one number, one uppercase letter, one lowercase letter, and one special character!' >&2
fi
Notes:
The last grep in the function actually only checks that the password contains characters other than alphanumeric or whitespace.
The -r option for read will preserve backslash characters
The -s option for read will hide user input (useful for password input)
answered yesterday
Jesse_b
11.7k23063
answered yesterday
Jesse_b
11.7k23063
answered yesterday
Jesse_b
11.7k23063
answered yesterday
Jesse_b
11.7k23063
11.7k23063
add a comment |
add a comment |
ElonCode is a new contributor. Be nice, and check out our Code of Conduct.
ElonCode is a new contributor. Be nice, and check out our Code of Conduct.
ElonCode is a new contributor. Be nice, and check out our Code of Conduct.
ElonCode is a new contributor. Be nice, and check out our Code of Conduct.
Thanks for contributing an answer to Unix & Linux Stack Exchange!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Some of your past answers have not been well-received, and you're in danger of being blocked from answering.
Please pay close attention to the following guidance:
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
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
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f487974%2flinux-checking-if-user-has-entered-numbers-and-letters%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
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
Required, but never shown
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
Required, but never shown
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
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Is your intent for it to require a number, uppercase, lowercase, and special character?
– Jesse_b
yesterday
@Jesse_b yes this is what I intend
– ElonCode
yesterday