/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 vote106 views1 answer
Grep stack overflow
Shell/Bash
9 votes106 views2 answers
Debian kill open port
Shell/Bash
0 vote100 views1 answer
Install figlet centos 8
Shell/Bash
2 votes103 views1 answer
Git commit back in time
Shell/Bash
4 votes111 views2 answers
Find in file linux
Shell/Bash
7 votes113 views2 answers
Uninstall nginx
Shell/Bash
3 votes106 views2 answers
See all apps linux
Shell/Bash
6 votes105 views3 answers
Copy my ssh key
Shell/Bash
6 votes109 views4 answers
Install xampp ubuntu 20.04
Shell/Bash
1 vote107 views3 answers
Brew install vscode
Shell/Bash