/Shell/Bash/How to compare a character to uppercase in bash script

How to compare a character to uppercase in bash script

Bash convert string to uppercase

var=hello #For Bash Version higher than 4.3.33 try these
echo ${var''} #Uppercase whole string
HELLO
echo ${var'} #Uppercase only first char of string
Hello
var2=BYE
echo ${var2,} #Lowercase whole string
bye
echo ${var2,,} #Lowercase only first char of string
bYE
echo $var | tr 'a-z' 'A-Z' #For lower versions of Bash just use tr command
HELLO

How to compare a character to uppercase in bash script

echo "enter a char"
read c

if [[ $c == [A-Z] ]];
then
    echo "upper"
elif [[ $c == [a-z] ]];
then
    echo "lower"
else 
    echo "Digit or special symbols!"
fi

Source: unix.stackexchange.com

Similar codes

0 vote152 views3 answers
Git see tags
Shell/Bash
2 votes132 views2 answers
Bash get one checksum for many files
Shell/Bash
1 vote134 views2 answers
Batch file comment after command
Shell/Bash
50 votes183 views1 answer
Check os type linux
Shell/Bash
0 vote215 views1 answer
Bash add extension to all files
Shell/Bash
2 votes143 views2 answers
Vscode display all extensions
Shell/Bash
0 vote138 views1 answer
View live log linux
Shell/Bash
4 votes140 views1 answer
Add image to docker hub
Shell/Bash
0 vote152 views2 answers
Jenkins commands run scheduled task
Shell/Bash
-4 votes141 views2 answers
Bash not found docker
Shell/Bash