GNU Command $> a1.txt $a > a2.txt bash: a: command not found $echo a > a2.txt $ls -S a2.txt a1.txt $ls -S -1 a2.txt a1.txt $ls -r -S -1 a1.txt a2.txt $ UNIX Explanation -S sort by file size -1 list one file per line -r, –reverse reverse order while sorting computer science Theory Drop …