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Scsh is a Unix shell in that is has significant syntax extensions to
make writing Unix shell scripts easy (constructing pipelines, setting
I/O redirection, conditional execution etc.). It also offers access to
lower-level functionality like all Posix system calls, TCP/IP sockets
and a full-featured regular expression library. This is embedded into
a general-purpose programming language with real data types,
extensive, syntactically clean control constructs and "real" quoting
rules.
Scsh is also a full implementation of R4RS Scheme with some
non-standard behavior (required for scripting). As a result, a wide
varity of exiting Scheme code can be used. The underlying Scheme
implementation is a virtual machine for compact byte code.
The name of the installed program is "scsh", the manpage is scsh(1),
other documentation is in (/usr/local/)lib/scsh/doc. To load slib,
install slib into /usr/local/lib/slib and run (load "slib-init.scm")
in scsh. It requires no additional setup (paths or such). The emacs
interface is in the original distribution in emacs/. For documentation
see doc/user-guide.txt.
Differences between FreeBSD port and generic scsh release:
----------------------------------------------------------
1) When hitting C-d (end-of-file), scsh asks 100 times for
confirmation. I changed the default to do this just once. Set constant
*y-or-n-eof-count* in scsh/rw.scm to change it.
2) The original scsh sends a mail to the scsh authors every time you
make the package. The FreeBSD port doesn't. The authors of scsh would
appreciate it if you do a `(cd work/scsh-0.4.4 && make .notify)` after
you build this package.
3) A symbolic link ${PREFIX}/share/doc/scsh to the documentation is
created.
4) Some basic description text files from the distribution base dir
are copied to lib/doc. The emacs directory is copied into
lib/scsh/emacs. scsh's default is not to install these files.
5) Some /usr/tmp -> /var/tmp
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