Common shell commands (1) -- variable case conversion

toggle case

Convert the input parameters of the script to case or lowercase

param1=${1^^}   # Convert to uppercase 
param2=${2,,}	# Convert to lowercase 

echo $param1
echo $param2

Case conversion of variables

Use typeset

Use typeset Set whether variables are saved in uppercase or lowercase , Two options -u It's the size ,-l It's lowercase .

param1=${1^^}   # Convert to uppercase 
param2=${2,,}	# Convert to lowercase 

echo $param1
echo $param2

typeset -l ccc
typeset -u ddd
ccc=$param1
ddd=$param2
echo $ccc
echo $ddd

Use tr

variable="ExampleCode"
uppercase=`echo $variable | tr 'a-z' 'A-Z'`
lowercase=$(echo $variable | tr '[A-z]' '[a-z]')

echo $uppercase
echo $lowercase