/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 vote339 views3 answers
How to add a shell script to launcher
Shell/Bash
0 vote324 views1 answer
Python rioxarray install
Shell/Bash
3 votes355 views1 answer
How to run a train animation in linux terminal
Shell/Bash
1 vote332 views1 answer
Reverse search command mac
Shell/Bash
0 vote358 views3 answers
Open rdp port windows 10 using command line
Shell/Bash
2 votes349 views2 answers
Retrieve git stash
Shell/Bash
0 vote368 views1 answer
Error when install irazasyed/telegram-bot-sdk in laravel 8
Shell/Bash
0 vote347 views1 answer
How to check version of package centos
Shell/Bash
92 votes320 views5 answers
Linux install node
Shell/Bash
1 vote353 views1 answer
How to I display powershell function code
Shell/Bash