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While most Perl one-liners are imperative, Perl's support for anonymous functions, closures, map, filter (grep) and fold (List::Util::reduce) allows the creation of 'functional' one-liners. This one-liner creates a function that can be used to return a list of primes up to the value of the first parameter:
The detailed semantics of "the" ternary operator as well as its syntax differs significantly from language to language. A top level distinction from one language to another is whether the expressions permit side effects (as in most procedural languages) and whether the language provides short-circuit evaluation semantics, whereby only the selected expression is evaluated (most standard ...
If-then-else flow diagram A nested if–then–else flow diagram. In computer science, conditionals (that is, conditional statements, conditional expressions and conditional constructs) are programming language constructs that perform different computations or actions or return different values depending on the value of a Boolean expression, called a condition.
An If statement may have more than one command in its body if, instead of a command, a Then token is placed. :If condition :Then :command :command :End When using Then, the body must be closed by an End token. One more construct utilizes Else. This allows one of two bodies to be executed. :If condition :Then :body one :Else :body two :End
nsh - "A command-line shell like fish, but POSIX compatible;" available on Arch. [154] osh - "Oil Shell is a Bash-compatible UNIX command-line shell;" available on Arch. Mashey or Programmer's Workbench shell; Qshell for IBM i; rc from Plan 9; RUNCOM; rush - Restricted User Shell, available on Debian. [45] Stand-alone shell (sash) scsh - The ...
Early interactive systems provided a simple command-line interpreter as part of the resident monitor. This interpreter might be called by different names, such as COMCON on DEC TOPS-10 systems. [6] The interpreter would execute one of a number of predefined commands, one of which would be to run a user program.
A shell script can provide a convenient variation of a system command where special environment settings, command options, or post-processing apply automatically, but in a way that allows the new script to still act as a fully normal Unix command. One example would be to create a version of ls, the command to list files, giving it a shorter ...
COMMAND.COM, the original Microsoft command line processor introduced on MS-DOS as well as Windows 9x, in 32-bit versions of NT-based Windows via NTVDM; cmd.exe, successor of COMMAND.COM introduced on OS/2 and Windows NT systems, although COMMAND.COM is still available in virtual DOS machines on IA-32 versions of those operating systems also.