/Shell/Bash/Bash uppercase bad substitution

Bash uppercase bad substitution

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

Similar codes

1 vote128 views1 answer
Ubuntu black screen on screen share
Shell/Bash
0 vote132 views1 answer
Android studio tar install to ubuntu 20
Shell/Bash
0 vote125 views1 answer
Execution failed for task ':react-native-firebase_auth:generateDebugRFile'
Shell/Bash
0 vote129 views1 answer
Grep without
Shell/Bash
2 votes147 views2 answers
Vite js
Shell/Bash
0 vote137 views1 answer
Add entry in authorized_keys from windows to linux host
Shell/Bash
0 vote121 views1 answer
Adb install --abi armeabi-v7a aab
Shell/Bash
0 vote136 views1 answer
Fsck fat32 partition
Shell/Bash
1 vote132 views1 answer
How to kill apache process in linux
Shell/Bash
0 vote128 views1 answer
Ubuntu dot to png
Shell/Bash