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From: Janis Papanagnou <janis_papanagnou+ng@hotmail.com>
Newsgroups: comp.unix.shell
Subject: Re: [ksh93] defunct 'fc' command?
Date: Mon, 1 Jul 2024 17:54:18 +0200
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On 01.07.2024 15:00, Geoff Clare wrote:
> Janis Papanagnou wrote:
> 
>> I noticed that 'fc' doesn't seem to work on my Limux platform (neither
>> with ksh93u+ nor with ksh93u+m). Usually I use that built-in command
>> only as 'fc -l' (to list the history entries), and omitting the '-l'
>> should execute these commands. Alas, 'fc <from> <to>' doesn't work;
>> for example
>>
>> $ fc -l 1013 1015
>> 1013	ls X
>> 1014	ls Y
>> 1015	ls Z
>> $ fc 1013 1015
>> 15
>> ^C
>> ?
>> ^Z[1] + Stopped                  fc 1013 1015
>> $ kill %%
>> [1] + Terminated               fc 1013 1015
>>
>>
>> Is that an issue in my environment (or on my platform), or a bug?
> 
> It's an issue with your expectation.

(Actually my [inappropriate] environment setting; see below.)

> By default, fc starts an editor.
> Presumably you don't have FCEDIT set, as your output shows the default
> editor (ed) was used; it was ed that wrote the "15" and the "?".

Argh! - Yes, you are right. I was confident that I had a sensible
definition, but I see that  FCEDIT=/bin/ed  and it didn't appear
to me that what I got was an 'ed' prompt. - Thanks!

> 
> If you just want the commands executed, you can specify an editor
> that does nothing:
> 
> fc -e true 1013 1015
> fc -e : 1013 1015

This is a nice code pattern.

> 
> Or, if you only want to execute one command, you can use -s (without
> specifying a substitution).

I had tried this before and got an inconsistent error message (-e
instead of -s) when [inappropriately] trying for a range

$ fc -s 1071 1073
ksh: fc: -e - requires single argument

so I haven't followed that path further.

> 
> This is all POSIX standard stuff.

Janis