/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 vote101 views1 answer
Sync two branches in git
Shell/Bash
0 vote125 views1 answer
Macos restart service
Shell/Bash
1 vote116 views1 answer
Method ReflectionParameter::getClass() is deprecated ubuntu
Shell/Bash
2 votes116 views1 answer
Pandas can't read excel
Shell/Bash
1 vote115 views1 answer
Install epel amazon linux 2
Shell/Bash
0 vote115 views1 answer
Linux save program console output to file
Shell/Bash
1 vote117 views1 answer
Ufw config file location ubuntu
Shell/Bash
0 vote109 views1 answer
How to remove a directory recursively ubuntu
Shell/Bash
50 votes106 views1 answer
Ubuntu cat release
Shell/Bash
13 votes117 views4 answers
Composer install debian
Shell/Bash