* ANSI escape codes in printf don't work
@ 2022-02-07 15:36 Subhaditya Nath
2022-02-07 15:55 ` Harald van Dijk
0 siblings, 1 reply; 2+ messages in thread
From: Subhaditya Nath @ 2022-02-07 15:36 UTC (permalink / raw)
To: dash
Run this -
/usr/bin/printf '\x1b[31m%s\x1b[m\n' FAIL
It should print FAIL in red foreground color.
It does, on other shells.
In dash, it doesn't.
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: ANSI escape codes in printf don't work
2022-02-07 15:36 ANSI escape codes in printf don't work Subhaditya Nath
@ 2022-02-07 15:55 ` Harald van Dijk
0 siblings, 0 replies; 2+ messages in thread
From: Harald van Dijk @ 2022-02-07 15:55 UTC (permalink / raw)
To: Subhaditya Nath, dash
Hi,
On 07/02/2022 15:36, Subhaditya Nath wrote:
> Run this -
>
> /usr/bin/printf '\x1b[31m%s\x1b[m\n' FAIL
>
> It should print FAIL in red foreground color.
> It does, on other shells.
> In dash, it doesn't.
Hexadecimal escape sequences are not specified by POSIX. They are a
common extension in other shells as you noticed but dash generally
limits itself to what POSIX specifies. Octal escape sequences are part
of the standard and supported by dash, and offer the same functionality:
printf '\033[31m%s\033[m\n' FAIL
Cheers,
Harald van Dijk
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2022-02-07 15:36 ANSI escape codes in printf don't work Subhaditya Nath
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