bash how to convert text to lowercase or uppercase
# Basic syntax:
tolower(string)
toupper(string)
# Example usage:
awk '{print tolower($0)}' input_file
# This prints every row ($0) converted to lowercase
awk '{print toupper($3)}' input_file
# This would print the third field ($3) converted to uppercaseconvert capital letters to lowercase in shell script
x="HELLO"
echo $x # HELLO
y=${x,,}
echo $y # hello
z=${y^^}
echo $z # HELLOhow 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!"
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