zsh tries to emulate sh or ksh when it is invoked
as sh or ksh respectively. In this mode the following
parameters are not special: ARGC, argv, cdpath,
fignore, fpath, HISTCHARS, mailpath,
MANPATH, manpath, path, prompt,
PROMPT, PROMPT2, PROMPT3, PROMPT4,
psvar, status, watch.
The usual zsh startup/shutdown scripts are not executed. Login shells
source `/etc/profile' followed by `$HOME/.profile'. If the
ENV environment variable is set on invocation, $ENV is sourced
after the profile scripts. The value of ENV is subjected to
parameter expansion, command substitution, and
arithmetic expansion before being interpreted as a pathname. Note that
the PRIVILEGED option also affects the execution of startup files.
See section Options, for more details.
The following options are set if the shell is invoked as sh or
ksh: NO_BAD_PATTERN, NO_BANG_HIST, NO_BG_NICE,
NO_EQUALS, NO_FUNCTION_ARGZERO, GLOB_SUBST,
NO_HUP, INTERACTIVE_COMMENTS, KSH_ARRAYS,
NO_MULTIOS, NO_NOMATCH, RM_STAR_SILENT,
POSIX_BUILTINS, SH_FILE_EXPANSION, SH_GLOB,
SH_OPTION_LETTERS, SH_WORD_SPLIT. Additionally the
KSH_OPTION_PRINT, LOCAL_OPTIONS, PROMPT_SUBST and
SINGLE_LINE_ZLE options are set if zsh is invoked as
ksh and the IGNORE_BRACES and BSD_ECHO options are
set if zsh is invoked as sh.
Go to the first, previous, next, last section, table of contents.