mirrors/zsh
1
0
Fork 0
mirror of git://git.code.sf.net/p/zsh/code synced 2025-09-02 10:01:11 +02:00
Code Releases Activity

45932: FAQ (3.1): Update ksh compatibility answer for reserved word typeset.

Browse source
This commit is contained in:
Daniel Shahaf 2020-05-28 20:30:49 +00:00
parent 43a7e70dad
commit f297132cf0
2 changed files with 22 additions and 9 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

3
ChangeLog
View file

@ -1,5 +1,8 @@
2020-06-07 Daniel Shahaf <d.s@daniel.shahaf.name>
* 45932: Etc/FAQ.yo: FAQ (3.1): Update ksh compatibility answer
for reserved word typeset.
* 45933: Etc/FAQ.yo: FAQ: Add "Why does my bash script report
an error when I run it under zsh?".

28
Etc/FAQ.yo
View file

@ -988,7 +988,7 @@ label(31)
been automatic word splitting in scalars, which is a sort of
uncontrollable poor man's array.
Note that this happens regardless of the value of the internal field
Note that word splitting happens regardless of the value of the internal field
separator, tt($IFS); in other words, with mytt(IFS=:; foo=a:b; args $foo)
you get the answer 1.
@ -1020,22 +1020,32 @@ label(31)
or (entirely equivalent) when mytt(emulate ksh) or mytt(emulate sh) is in
effect.
There is one other effect of word splitting which differs between ksh
There used to be another effect of word splitting which differed between ksh
and zsh. In ksh, the builtin commands that declare parameters such
as tt(typeset) and tt(export) force word-splitting not to take place
after on an assignment argument:
verb(
typeset param=`echo foo bar`
)
in ksh will create a parameter with value mytt(foo bar), but in zsh will
in ksh will create a parameter with value mytt(foo bar).
zsh used to
create a parameter tt(param) with value tt(foo) and a parameter tt(bar)
whose value is empty. Contrast this with a normal assignment (no
whose value was empty. Contrast this with a normal assignment (no
tt(typeset) or other command in front), which never causes a word split
unless you have tt(GLOB_ASSIGN) set. From zsh version 4.0.2 the option
tt(KSH_TYPESET), set automatically in compatibility mode, fixes this
problem. Note that in bash this behaviour occurs with all arguments that
look like assignments, whatever the command name; to get this behaviour
in zsh you have to set the option tt(MAGIC_EQUAL_SUBST).
unless you have tt(GLOB_ASSIGN) set.
zsh version 4.0.2 and newer creates a single parameter with value
mytt(foo bar), like ksh does, when the option tt(KSH_TYPESET) is set.
This option gets set automatically when in ksh compatibility mode.
zsh 5.1 and newer create a single parameter with value mytt(foo bar) by
default, in both compatibility and native modes. The older behaviour
can be obtained with mytt(disable -r typeset).
If the options mytt(MAGIC_EQUAL_SUBST) and mytt(KSH_TYPESET) are both
set, arguments that look like assignments will not undergo word
splitting, whatever the command name.
sect(In which startup file do I put...?)