ksh:tldr:0ac29

This command is written in a shell scripting language called ksh (KornShell). The command is executed by invoking ksh and passing the -c flag, followed by a command wrapped in double quotes.

The command itself is ${echo 'ksh is executed'}. Here's a breakdown of what it does:

1. ${...} is a syntax used in shell scripting to refer to a variable or perform parameter expansion.
2. Within ${...}, we have echo 'ksh is executed'. This is a command to print the string 'ksh is executed' to the console.

So, when you run the ksh -c "${echo 'ksh is executed'}" command, it will execute the echo 'ksh is executed' command, and the output will be 'ksh is executed' displayed on the console.