Re: Equivalent of set -- *(DN) in sh

[ZyX <kp-pav@yandex.ru>]

19.01.2015, 19:02, "ZyX" <kp-pav@yandex.ru>:
> 19.01.2015, 18:55, "ZyX" <kp-pav@yandex.ru>:
>>  19.01.2015, 18:51, "ZyX" <kp-pav@yandex.ru>:
>>>   18.01.2015, 23:53, "Eric Cook" <llua@gmx.com>:
>>>>    On 01/18/2015 01:28 PM, Nikolai Weibull wrote:
>>>>>     Hi!
>>>>>
>>>>>     Is there any way to get the equivalent of Zsh’s
>>>>>
>>>>>     set -- *(DN)
>>>>>
>>>>>     in sh?  Most important here would be NULL_GLOB, as, by default, sh
>>>>>     simply leaves the * if there are no files to match.
>>>>>
>>>>>     Thanks!
>>>>    match() {
>>>>      test "$#" -gt 2 && return
>>>>      test -e "$1"    && return
>>>>      return 1
>>>>    }
>>>>
>>>>    set --
>>>>    for pat in '.[^.]*' '*'; do # *(DN) ignores . and ..
>>>   `..foo` is a valid name, but it is being excluded. You need to add `'.??*'` to the list of patterns.
>>  No, this may make duplicates. Then `'..?*'`.
>
> And you must replace `[^.]` with `[!.]`. mksh does not support `[^]` and treats this as `[\^.]`, but other shells I have (dash, ksh, zsh (in sh emulation mode), bash, busybox ash) are fine with both `[!.]` and `[^.]`.
>>>>      if match $pat; then
>>>>        set -- "$@" $pat
>>>>      fi
>>>>    done
>>>>    unset pat
>>>>
>>>>    test "$#" -gt 0 && printf '%s\n' "$@"

Also note that if you need *full* equivalent of *(DN) you need to do something with ordering. I have checked all the shells with

    for sh in dash ksh mksh zsh bash bb ; do $sh set--sDN.sh > set--sDN.$sh.log ; done

with

    emulate -L sh &>/dev/null
    match() {
      test "$#" -gt 2 && return
      test -e "$1"    && return
      return 1
    }
    
    set --
    for pat in '.[!.]*' '..?*' '*'; do # *(DN) ignores . and ..
      if match $pat; then
        set -- "$@" $pat
      fi
    done
    unset pat
    
    test "$#" -gt 0 && printf '>>%s<<\n' "$@"

in set--sDN.sh file and have the following md5sums:

    % md5sum set--sDN.*.log | sort
    4601e6d9c845fe88e5166db3be04cc75  set--sDN.bash.log
    4601e6d9c845fe88e5166db3be04cc75  set--sDN.ksh.log
    4601e6d9c845fe88e5166db3be04cc75  set--sDN.zsh.log
    ac2c245cdac664121a348c6b05ea2f44  set--sDN.bb.log
    ac2c245cdac664121a348c6b05ea2f44  set--sDN.dash.log
    ac2c245cdac664121a348c6b05ea2f44  set--sDN.mksh.log

: two variants of ordering:

bash/ksh/zsh:

    >>.abc<<
    >>.b<<
    >>.^foo<<
    >>..foo<<
    >>
    <<
    >>1<<
    >>17<<
    >>2<<
    >>append-remove.bash<<
    >>getnumbers.bash<<
    >>grepdir<<
    >>nroff<<
    >>parinput.bash<<
    >>qwerty<<
    >>rl.sh<<
    >>script_path.bash<<
    >>set--sDN.bash.log<<
    >>set--sDN.bb.log<<
    >>set--sDN.dash.log<<
    >>set--sDN.ksh.log<<
    >>set--sDN.mksh.log<<
    >>set--sDN.sh<<
    >>set--sDN.zsh.log<<
    >>tes.bash<<
    >>test<<
    >>test2.bash<<
    >>test3.bash<<
    >>test.bash<<
    >>testdir<<
    >>test-rename.sh<<
    >>test-so-2914220.bash<<
    >>t.tar<<
    >>ttttt.tar.bz2<<
    >>ttttt.tar.gz<<

bb/dash/mksh:

    >>.^foo<<
    >>.abc<<
    >>.b<<
    >>..foo<<
    >>
    <<
    >>1<<
    >>17<<
    >>2<<
    >>append-remove.bash<<
    >>getnumbers.bash<<
    >>grepdir<<
    >>nroff<<
    >>parinput.bash<<
    >>qwerty<<
    >>rl.sh<<
    >>script_path.bash<<
    >>set--sDN.bash.log<<
    >>set--sDN.bb.log<<
    >>set--sDN.dash.log<<
    >>set--sDN.ksh.log<<
    >>set--sDN.mksh.log<<
    >>set--sDN.sh<<
    >>set--sDN.zsh.log<<
    >>t.tar<<
    >>tes.bash<<
    >>test<<
    >>test-rename.sh<<
    >>test-so-2914220.bash<<
    >>test.bash<<
    >>test2.bash<<
    >>test3.bash<<
    >>testdir<<
    >>ttttt.tar.bz2<<
    >>ttttt.tar.gz<<

(note position of t.tar).

I have verified that all tests emit essentially the same result by using `for f in set--sDN.*.log ; do cat $f | sort | md5sum ; done | uniq`. But both orderings are different from the zsh one:

    % zsh -f -c 'for f in *(DN); do echo ">>$f<<" ; done'
    >>
    <<
    >>1<<
    >>17<<
    >>2<<
    >>.abc<<
    >>append-remove.bash<<
    >>.b<<
    >>.^foo<<
    >>..foo<<
    >>getnumbers.bash<<
    >>grepdir<<
    >>nroff<<
    >>parinput.bash<<
    >>qwerty<<
    >>rl.sh<<
    >>script_path.bash<<
    >>set--sDN.bash.log<<
    >>set--sDN.bb.log<<
    >>set--sDN.dash.log<<
    >>set--sDN.ksh.log<<
    >>set--sDN.mksh.log<<
    >>set--sDN.sh<<
    >>set--sDN.zsh.log<<
    >>tes.bash<<
    >>test<<
    >>test2.bash<<
    >>test3.bash<<
    >>test.bash<<
    >>testdir<<
    >>test-rename.sh<<
    >>test-so-2914220.bash<<
    >>t.tar<<
    >>ttttt.tar.bz2<<
    >>ttttt.tar.gz<<

(note: I have filename with newline, this is why I added `>><<`.)