32 lines
591 B
Bash
Executable File
32 lines
591 B
Bash
Executable File
#!/bin/bash
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read -p "Please enter your username: " username
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if [[ -z "$username" ]]; then
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echo "You must enter a username"
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exit 1
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fi
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badChar=false
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for ((i=0; i<${#username}; i++)); do
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char="${username:i:1}"
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if ! [[ "$char" =~ [A-Za-z] ]]; then
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badChar=true
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break
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fi
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done
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firstChar="${username:0:1}"
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validFirstLetter=false
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if [[ "$firstChar" =~ [A-Za-z] ]]; then
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validFirstLetter=true
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fi
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if ! $badChar && (( ${#username} <= 20 )) && $validFirstLetter; then
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echo "The username $username is valid"
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else
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echo "The username is not valid"
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fi
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