[RndTbl] shell quoting inside $( )?

[Scott Toderash]

Not sure if this is it, but backticks.

eg.

EXPD=$(date -d"$(`$(openssl x509 -noout -text -in "$1")` | sed -n 
's/^.*Not After : //p')" +%Y%b%d)


On 2023-02-26 18:07, Adam Thompson wrote:
> I’m trying to figure out if there’s a way to do this more
> compactly (for reasons…):
> 
> T=$(openssl x509 -noout -text -in "$1")
> 
> EXPD=$(date -d"$(echo "$T" | sed -n 's/^.*Not After : //p')" +%Y%b%d)
> 
> SUBJ=$(echo "$T" | sed -n 's/^.*Subject: .*CN = //p')
> 
> I am having two issues:
> 
>  	* Bash doesn’t happily let me embed double quotes inside a
> subshell inside a subshell inside double-quotes.  All of the
> double-quotes are required, AFAICT.  So doing
> X=$(…”$(…”xxx”)”) just doesn’t work because bash
> doesn’t parse nested double-quotes.  But both the inner var and the
> result can and will have spaces in them.
> 	* I can’t remember how in shell (bash, in this case) how to
> bifurcate stdout and have it run to two pipelines.  I figure echo is a
> builtin, so should at least be lighter than re-running the monstrosity
> that is openssl over and over.  I have a vague recollection that this
> is harder than it sounds, and may not be worth it…
> 
> Any suggestions on how to solve either issue?  I’m sure I’ve just
> forgotten some obvious technique, hopefully someone can jog my mind.
> 
> -Adam
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