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77 lines
2.2 KiB
Text
77 lines
2.2 KiB
Text
texinode(Compatibility)(Prompt Expansion)(Conditional Expressions)(Top)
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chapter(Compatibility)
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ifzman(\
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sect(Compatibility)
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)\
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cindex(compatibility)
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cindex(sh, compatibility)
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cindex(ksh, compatibility)
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Zsh tries to emulate bf(sh) or bf(ksh) when it is invoked as
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tt(sh) or tt(ksh) respectively; more precisely, it looks at the first
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letter of the name by which it was invoked, excluding any initial `tt(r)'
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(assumed to stand for `restricted'), and if that is `tt(s)' or `tt(k)' it
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will emulate bf(sh) or bf(ksh). Furthermore, if invoked as tt(su) (which
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happens on certain systems when the shell is executed by the tt(su)
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command), the shell will try to find an alternative name from the tt(SHELL)
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environment variable and perform emulation based on that.
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In bf(sh) and bf(ksh) compatibility modes the following
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parameters are not special and not initialized by the shell:
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tt(ARGC),
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tt(argv),
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tt(cdpath),
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tt(fignore),
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tt(fpath),
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tt(HISTCHARS),
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tt(mailpath),
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tt(MANPATH),
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tt(manpath),
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tt(path),
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tt(prompt),
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tt(PROMPT),
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tt(PROMPT2),
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tt(PROMPT3),
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tt(PROMPT4),
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tt(psvar),
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tt(status),
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tt(watch).
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The usual zsh startup/shutdown scripts are not executed. Login shells
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source tt(/etc/profile) followed by tt($HOME/.profile). If the
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tt(ENV) environment variable is set on invocation, tt($ENV) is sourced
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after the profile scripts. The value of tt(ENV) is subjected to
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parameter expansion, command substitution, and arithmetic expansion
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before being interpreted as a pathname. Note that the tt(PRIVILEGED)
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option also affects the execution of startup files.
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The following options are set if the shell is invoked as tt(sh) or
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tt(ksh):
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tt(NO_BAD_PATTERN),
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tt(NO_BANG_HIST),
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tt(NO_BG_NICE),
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tt(NO_EQUALS),
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tt(NO_FUNCTION_ARGZERO),
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tt(GLOB_SUBST),
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tt(NO_HUP),
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tt(INTERACTIVE_COMMENTS),
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tt(KSH_ARRAYS),
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tt(NO_MULTIOS),
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tt(NO_NOMATCH),
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tt(NO_NOTIFY),
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tt(POSIX_BUILTINS),
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tt(NO_PROMPT_PERCENT),
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tt(RM_STAR_SILENT),
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tt(SH_FILE_EXPANSION),
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tt(SH_GLOB),
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tt(SH_OPTION_LETTERS),
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tt(SH_WORD_SPLIT).
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Additionally the tt(BSD_ECHO) and tt(IGNORE_BRACES)
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options are set if zsh is invoked as tt(sh).
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Also, the
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tt(KSH_OPTION_PRINT),
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tt(LOCAL_OPTIONS),
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tt(PROMPT_BANG),
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tt(PROMPT_SUBST)
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and
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tt(SINGLE_LINE_ZLE)
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options are set if zsh is invoked as tt(ksh).
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