tcsh:tldr:35fe4
tcsh: Execute specific [c]ommands.
$ tcsh -c "${echo 'tcsh is executed'}"
try on your machine
This command runs the tcsh (TENEX C Shell) and passes a command to be executed within the shell.
The command -c is an option for the tcsh shell that allows you to specify a command to run within the shell.
The ${echo 'tcsh is executed'} is the command being passed to the shell.
${...} is an expansion syntax used in tcsh to evaluate or substitute the value of a variable or expression. In this case, echo is a command in tcsh used to print text to the console, and 'tcsh is executed' is the text being printed.
So, when you execute the full command tcsh -c "${echo 'tcsh is executed'}" in a terminal, it will start the tcsh shell and execute the given command, which will print "tcsh is executed" as the output.
This explanation was created by an AI. In most cases those are correct. But please always be careful and
never run a command you are not sure if it is safe.