I use lmod to generate the corresponding module files of Intel oneapi, and find the following code snippets in the result:

werner@X10DAi-00:/opt/intel/oneapi$ sh_to_modulefile setvars.sh
[...]
set_shell_function("save_args"," \
for arg in \"$@\";\
do\
printf \"%s\\n\" \"$arg\" | sed -e \"s/'/'\\\\\\\\''/g\" -e \"1s/^/'/\" -e \"\\$s/\\$/' \\\\\\\\/\";\
done;\
echo \" \"\
","")

There are so many '\' in it, which dazzles me. It this a good style of shell script?

Regards,
HZ

On 12/30/21 3:47 PM, hongy...@gmail.com wrote:
> There are so many '\' in it, which dazzles me. It this a good style
> of shell script?

I would not call it /good/ by any stretch of the imagination.

Sometimes it's /necessary/ to do things like that.

The eight (8) backslashes tell me that it's an escape of an escape of an
escape of an escape.

1st: \
2nd: \\
3rd: \\\\
4th: \\\\\\\\

The thought of needing four levels of escaping makes me shudder. I
would think that there would have to be a better way to do what's being
done.

--
Grant. . . .
unix || die

On 30.12.2021 23:47, hongy...@gmail.com wrote:
> I use lmod to generate the corresponding module files of Intel oneapi, and find the following code snippets in the result:
>
> werner@X10DAi-00:/opt/intel/oneapi$ sh_to_modulefile setvars.sh
> [...]
> set_shell_function("save_args"," \
> for arg in \"$@\";\
> do\
> printf \"%s\\n\" \"$arg\" | sed -e \"s/'/'\\\\\\\\''/g\" -e \"1s/^/'/\" -e \"\\$s/\\$/' \\\\\\\\/\";\
> done;\
> echo \" \"\
> ","")
>
> There are so many '\' in it, which dazzles me.

This looks like shell code that is just _embedded_ in some *other*
language. Try a newsgroup/forum of *that* language to get an answer!

> It this a good style of shell script?

Of course not. But the horrific number of '\' is not (not alone) a
shell question in this context.

I suggest to remove the unnecessary escapes at the outer level to
create pure (functional correct) shell code and then post this code
to see where there's potential for optimization or use of other tools.

Janis

>
> Regards,
> HZ
>
>

On 12/30/2021 5:47 PM, hongy...@gmail.com wrote:
> I use lmod to generate the corresponding module files of Intel oneapi, and find the following code snippets in the result:
>
> werner@X10DAi-00:/opt/intel/oneapi$ sh_to_modulefile setvars.sh
> [...]
> set_shell_function("save_args"," \
> for arg in \"$@\";\
> do\
> printf \"%s\\n\" \"$arg\" | sed -e \"s/'/'\\\\\\\\''/g\" -e \"1s/^/'/\" -e \"\\$s/\\$/' \\\\\\\\/\";\
> done;\
> echo \" \"\
> ","")
>
> There are so many '\' in it, which dazzles me. It this a good style of shell script?
>
> Regards,
> HZ
>
>

Merely 8 escapes? You should take a look at old nroff/troff macros;
I remember seeing 64 backslashes. Sadly, sometimes there is no
great alternative.

--
Wayne