unix What does the following string present? (\\+1)? ([0 -9]+\\?[0-9] 1\\[0-9]+)

Question

unix What does the following string present? (+1)? ([0 -9]+?[0-9] 1[0-9]+)([eE](+1)?[0-9]+)? Regular expression for various number including an upper or lower case e strings that start with +/and end with? Regular expression for floating point numbers none of the above describe the function of the following sell script nil echo file renames all files and dirt and dirt changing upper case letters to lower case and redirects steers output to dev/null renames the first 2 file names from upper to lowercase and sends the error to dev/null moves all files from diaper to dir. lower and redirects steer to dev/null renames files in all dirs. from upper to lower case names and sends result to dev/null This command carats the files and directories in the/etc dr

Explanation / Answer

Q13. A -> regex for various number including E or e.

Q14. C -> shell script for move all files from dir:upper to dir:lower and redirects stderr to /dev/null

(>redirect syntax)

([:upper:][:lower:] -> which is POSIX regex)

Q15. True -> command will count the files and directories and shows the output(number)

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