A.54 library(shell): Elementary shell commands
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Availability::- use_module(library(shell)).(can be autoloaded)
Sourceshell_command(-Shell:atom)
True when Shell is the preferred executable for running an interactive shell. Used by shell/0. The following options are tried to find a suitable shell command:

  1. The Prolog flag shell
  2. The environment variable %comspec% (Windows only)
  3. The environment variable $SHELL
  4. The Prolog flag posix_shell
Errors
existence_error(config, shell) if no suitable shell can be found.
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