/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

0 vote211 views2 answers
Powershell recursive copy skip if file already exists
Shell/Bash
0 vote243 views1 answer
Keepalived initialization file
Shell/Bash
-1 vote216 views2 answers
Install gh
Shell/Bash
0 vote216 views1 answer
How to upgrade cpu of my instance in aws
Shell/Bash
2 votes231 views1 answer
Uninstall Expo CLI
Shell/Bash
-1 vote236 views2 answers
Youtube dl text tracked playlist download
Shell/Bash
1 vote217 views1 answer
Uninstall edb postgres mac
Shell/Bash
0 vote225 views2 answers
Connecting to timescaledb from terminal
Shell/Bash
0 vote229 views1 answer
The repository 'https://download.docker.com/linux/ubuntu bionic InRelease' is not signed.
Shell/Bash
0 vote220 views1 answer
How to create a shortcut in a batch file
Shell/Bash