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Re: extract values from a string

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On Sat, Apr 16, 2022 at 09:27:52PM -0500, Kent West wrote:
> -- data.txt --
> black berry 12
> blue berry 14
> raspberry 9
> huckle berry hound 3
> bare-knuckle sandwich 27
> 
> -- test.sh --
> #!/bin/bash
> 
> file="data.txt"
> 
> while read -r line; do
>    productID=$(awk -F' ' '{$NF=""; print $0}' <<< $line)
>    price=$(awk -F' ' '{print $NF}' <<< $line)

Two awks...

>    retail=$(($price * 2))
>    printf "The price of \'$productID\' is \$$price. We will retail it for
> \$$retail.\n"
> done <$file
> 
> 
> -- $./test.sh --
> The price of 'black berry ' is $12. We will retail it for $24.
> The price of 'blue berry ' is $14. We will retail it for $28.
> The price of 'raspberry ' is $9. We will retail it for $18.
> The price of 'huckle berry hound ' is $3. We will retail it for $6.
> The price of 'bare-knuckle sandwich ' is $27. We will retail it for $54.

... and you still left trailing whitespace on the product names.

Also, your printf is wrong.  You're injecting the variable contents into
the format argument.  You should be using %s placeholders in the format,
and then passing each variable as a separate argument.

Here's a version that uses zero forks, and removes the trailing
whitespace correctly.  It's the same parameter expansion with extended
globs that I showed earlier in this thread.

unicorn:~$ cat foo
#!/bin/bash
shopt -s extglob
while read -r line; do
    price=${line##*[[:space:]]}
    retail=$((price * 2))
    product=${line%%+([[:space:]])"$price"}
    printf "The price of '%s' is \$%d.  We will retail it for \$%d.\n" \
	"$product" "$price" "$retail"
done
unicorn:~$ ./foo < data.txt
The price of 'black berry' is $12.  We will retail it for $24.
The price of 'blue berry' is $14.  We will retail it for $28.
The price of 'raspberry' is $9.  We will retail it for $18.
The price of 'huckle berry hound' is $3.  We will retail it for $6.
The price of 'bare-knuckle sandwich' is $27.  We will retail it for $54.

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extract values from a string wilson <info@bigcount.xyz> - 2022-04-16 04:40 +0200
  Re: extract values from a string Greg Wooledge <greg@wooledge.org> - 2022-04-16 05:10 +0200
  Re: extract values from a string Nicholas Geovanis <nickgeovanis@gmail.com> - 2022-04-16 18:10 +0200
    Re: extract values from a string <tomas@tuxteam.de> - 2022-04-16 18:20 +0200
      Re: extract values from a string Nicholas Geovanis <nickgeovanis@gmail.com> - 2022-04-16 18:50 +0200
      Re: extract values from a string Greg Wooledge <greg@wooledge.org> - 2022-04-16 19:30 +0200
    Re: extract values from a string Kent West <westk@acu.edu> - 2022-04-17 04:30 +0200
      Re: extract values from a string Greg Wooledge <greg@wooledge.org> - 2022-04-17 05:00 +0200
  Re: extract values from a string David Christensen <dpchrist@holgerdanske.com> - 2022-04-16 21:30 +0200
  Re: extract values from a string Ash Joubert <ash@transient.nz> - 2022-04-17 02:40 +0200
    Re: extract values from a string Ash Joubert <ash@transient.nz> - 2022-04-17 02:40 +0200
    Re: extract values from a string Greg Wooledge <greg@wooledge.org> - 2022-04-17 02:40 +0200
      Re: extract values from a string Ash Joubert <ash@transient.nz> - 2022-04-17 02:50 +0200

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