How to get result (not return code) from grep into a variable

There is another way to use do shell script in AppleScript:

use framework "Foundation"
use scripting additions

property NSArray : a reference to current application's NSArray

set theRangeStr to text returned of (display dialog "enter your page numbers: " default answer "") as text
set pageLst to paragraphs of my handle_pages(theRangeStr)
set outStr to ((NSArray's arrayWithArray:pageLst)'s componentsJoinedByString:return) as text
display dialog "Original: " & theRangeStr & return & return & outStr with title "Expanded Page Series"
return

on handle_pages(astr)
	return (do shell script "/bin/zsh -s <<'EOF' - " & astr's quoted form & "
#!/bin/zsh

typeset -ga values=() series=()
# strip any spaces from input string and remap any non-comma separator character ranges
str=\"${1:gs/ //}\"
strx=\"$(tr '[\\041-\\053\\056-\\057\\072-\\100\\137]' ',' <<<\"${str}\")\"

function range_expand () {
    local str=\"${1}\"
    values+=( ${(s:,:)str} )
    for n in $values;
    do
        [[ $n =~ '-' ]] || { series+=( $n ); continue}
        # expand series to sequence
        series+=( {${n:s/-/../}} )
    done
    return
}

range_expand \"${strx}\"
for n in $series; do print $n;done
unset values series
EOF")
end handle_pages

You can run this from the Script Editor, or directly from the command-line:

/usr/bin/osascript zsh_exp_range.applescript

In this example, you are running a full Zsh script from the do shell script and it can internally assign variables and return them via the print command.

Input dialog:

Result:

Variabe_name=$(grep -c   "c9b09af7a76c7abe17ce9f15b6da3820" /Users/teba/tasks/photo_work/photo_md5_dir_list.csv |sed -r "s/\s+//g" | awk -F ":"  '{print $1,$2}' | sort -nr -k2| head -1)

echo $Variabe_name

AppleScript will not return nbr_Found from your do shell script. Remove it and the $( ... ) syntax. Any double-quote inside the starting and ending double-quote of the do shell script must be escaped (e.g. "\"") and so must any other left-leaning backslash (e.g. \\s+)

set nbr_Found to (do shell script "grep -c \"c9b09af7a76c7abe17ce9f15b6da3820\" ~/tasks/photo_work/photo_md5_dir_list.csv | sed -r \"s/\\s+//g\" | awk -F \":\"  '{print $1,$2}' | sort -nr -k2 | head -1")

And now you know how painful it is to perform complicated things in a do shell script with fluent double-quotes and backslashes… 🤯

Impressive! 👍

I do not do Apple Script. Sorry. But VikingOSX is rather good at it.

You are welcome.