bash: adjust example to read from file into array #2187
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* use `$()` rather than deprecated `\`\`` * illustrate shortcut for builtin read of file without `cat` * don't imply this reads lines, it will split into words by default perhaps the cheatsheet should have a section on IFS, but that's off-topic for this patch.
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$()rather than deprecated ``catperhaps the cheatsheet should have a section on IFS, but that's off-topic for this patch.