\!:n* - argument selector for the arguments from the n th to the last sufficient arguments need not be supplied. \!:n-$ - argument selector for the arguments from the n th to the last at least argument n MUST be supplied. \!:m-n - argument selector for the arguments from the m th to the n th arguments MUST be supplied. \!:n - argument selector for the n th argument argument MUST be supplied n=0 refers to the alias/command name. \!^ - argument selector for first argument argument MUST be supplied. \!$ - argument selector for the last argument argument need not be supplied, but if none is supplied, the alias name is considered to be the last argument. \!* - argument selector for all arguments, excluding the alias/command arguments need not be supplied. \!# - argument selector for all arguments, including the alias/command itself arguments need not be supplied. Tcsh is the only shell that provides this feature. Alias argument selectors the ability to define an alias to take arguments supplied to it and apply them to the commands that it refers to. Auto-completion of file names and variables as well as programmable completion at the command line. !:n-$ - refers to the n th through the last argument from the previous command. !:m-n - refers to the m th through n th arguments from the previous command. !:n - refers to the n th argument from the previous command. !^ - refers to the first argument from the previous command. 
!$ - refers to the last argument from the previous command. !* - refers to all of the arguments from the previous command. !? string executes the most recently executed command that contains string. ! string executes the most recently executed command that starts with string. !-n executes the command that was executed n commands ago. !n executes the nth command that was previously executed. Invoking previous commands using command history. Use of ↑ / ↓ at the command line to allow the user to select a command from the history to edit/execute. The built-in history command displays the previously-entered commands. On October 3, 1983, Greer posted source to the net.sources newsgroup. Labs added command completion in September 1983. PACKET TRACER FOR MAC OS FREE DOWNLOAD CODE
Greer began working on his code to implement Tenex-style file name completion in September 1975, finally merging it into the C shell in December 1981. The “t” in tcsh comes from the “T” in TENEX, an operating system which inspired Ken Greer at Carnegie Mellon University, the author of tcsh, with its command-completion feature. The former is based on the original BSD version of csh and the latter is the improved tcsh. On Debian and some derivatives (including Ubuntu), there are two different packages: csh and tcsh. Often one of the two files is either a hard link or a symbolic link to the other, so that either name refers to the same improved version of the C shell. On many systems, such as macOS and Red Hat Linux, csh is actually tcsh. Tcsh is very stable but new releases continue to appear roughly once a year, consisting mostly of minor bug fixes. Though it started as a side branch from the original csh source tree that Bill Joy had created, tcsh is now the main branch for ongoing development. Because it only added functionality and did not change what was there, tcsh remained backward compatible with the original C shell. Tcsh added filename and command completion and command line editing concepts borrowed from the TENEX operating system, which is the source of the “t”. It is the native root shell for BSD-based systems such as FreeBSD. Unlike the other common shells, functions cannot be defined in a tcsh script and the user must use aliases instead (as in csh).
It is essentially the C shell with programmable command-line completion, command-line editing, and a few other features.
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