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An alias will last for the life of the shell session. Regularly used aliases can be set from the shell's rc file (such as .bashrc) so that they will be available upon the start of the corresponding shell session. The alias commands may either be written in the config file directly or sourced from a separate file.
The example ~/.bash_profile below is compatible with the Bourne shell and gives semantics similar to csh for the ~/.bashrc and ~/.bash_login. The [ -r filename ] && cmd is a short-circuit evaluation that tests if filename exists and is readable, skipping the part after the && if it is not.
The C shell also introduced many features for interactive work, including the history and editing mechanisms, aliases, directory stacks, tilde notation, cdpath, job control and path hashing. On many systems, csh may be a symbolic link or hard link to TENEX C shell (tcsh), an improved version of Joy's original version. Although the interactive ...
This is triggered by parenthesized suffixes in the optstring specifying long aliases. [7] KornShell and Zsh both have an extension for long arguments. The former is defined as in Solaris, [8] while the latter is implemented via a separate zparseopts command. [9] KornShell additionally implements optstring extensions for options beginning with ...
Using an alias as an email address gives you all the benefits of 2 email addresses without any of the added hassle. Enjoy conveniences such as one password and a centralized Inbox for all your emails. Launch Desktop Gold. Sign on with your username and password. Click the Write icon at the top of the window.
Having the shell prompt for missing values will allow the author of a script, command or function to mark a parameter as mandatory instead of creating script code to either prompt for the missing values (after determining that it is being run interactively) or fail with a message.
Those measures usually include barriers across roads and sidewalks − cities often use trash trucks or snowplows − along with jersey barriers to create an s-shaped approach to limit vehicles ...
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. Tcsh is the only shell that provides this feature (in lieu of functions). \!# - argument selector for all arguments, including the alias/command itself; arguments need not be supplied.