1 The original Steve R. Bourne shell from the 7th edition Unix including
2 System III, 4.3BSD-Reno, Ultrix 3.1 and ``home made'' fixes and enhancements :
4 * `--' end of options added (sysIII). `set +x' and such added (sysIII).
5 `/etc/bsh_profile' (sysIII) and `$HOME/.bsh_profile' (unsw) are
6 sourced at login time if they exist. Initially, only the `.profile'
7 located in the current directory was sourced at login time if it
8 exists. They have been `bsh_' prefixed to avoid conflicts w/ the
9 standards `profiles' which can contains unsupported expressions
10 such as shell functions. negation (! or ^) in `[]' added (sysIII).
11 `${x:-x}' and similar expressions added (sysIII). '<<-' (aka strip
12 leading tab in here document) added (sysIII). `#' comments are
13 allowed in shell scripts (sysIII/reno), but not on the command line
14 (reno) ! `break N' and `continue N' fixed (sysIII/ultrix). `if...
15 then... [elif... [else...]] fi' fixed (reno). `test' (sysIII) and
16 `ulimit' (ultrix) builtins added.
17 * ANSI-fication to permit an almost warning free compilation (home made).
18 `union trenod' taken from 4.3BSD-Reno. better signal handling and
19 error recovery (sysIII/reno). better restricted shell (sysIII) and
20 IFS protection (reno).
21 * functions aren't supported and command line input is not 8 bit clean.
23 WWW: http://minnie.tuhs.org/UnixTree/V7/