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Braces in bash

Square braces

The difference between [ and [[ See What's the difference between [ and [[ in Bash?

Curly braces

$ var1=hello
$ var2=also
$ echo $var1
hello
$ echo $(var1)
"bash: var1: command not found" True, round braces are used to catch the result of a command like in **allfiles=$(ls -1)**
$ echo $[var1]
0
$ echo ${var1}
hello
$ echo ${var1}also
helloalso
$ echo ${var1}${var2}
helloalso

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