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You use variables as symbolic names for values in your application. The names of variables, called identifiers, conform to certain rules. A JavaScript identifier must start with a letter, underscore (_), or dollar sign ($); subsequent characters can also be digits (0-9).
http://www.tcsh.org/tcsh.html/Special_shell_variables.html#echo. Special shell variables. verbose If set, causes the words of each command to be printed, after history substitution (if any).Set by the-v command line option. echo If set, each command with its arguments is echoed just before it is executed.For non-builtin commands all expansions occur before echoing.nother option is to put -x at the top of your script instead of on the command line: (Insufficient rep to comment on chosen answer.). share | improve this answer. answered May 12 '13 at 20:24. nooj. 199 1 4. Note that this doesn't seem to work exactly the same between ./myScript and bash myScript.