Start by looping over all entry listings in the current directory . Use a for OR

Question

Start by looping over

all

entry listings in the current directory

. Use a

for

OR

for ... in

loop structure. Then

for each entry

, do the following:

1. Print out whether the entry name starts with a lower-case letter, upper-case

letter or a number or something else.

HINT: Use a

case

statement. Because the pattern matching for letters is case

insensitive, use the groups

[[:lower:]]

and

[[:upper:]]

rather than

[a-z]

and

[A-Z]

respectively. See slides for week 9.

2. Check the following (use a series of nested

if..then..else

statements):

A. If the entry is a directory, print this fact out and go to next entry.

B. If the entry is a file, check to see if it is readable.

a) If the file is not readable print this fact out and go to the next entry.

b) Else, check to see If the file is executable

If it is not executable, display the contents of the file and go to the entry.

Else, If it is executable, check to see if the file is the same name as

the script you are running.

HINT: Compare $entry to see if it is running your script.

You can do this by check the name of the currently

running program (the $0 variable) to the entry name:

if [ "$entry" = $0 ]

if so, skip executing the script

if not, then execute the file.

So, basically, display any readable but non-executable file and execute any

readable and executable file (unless it is the script being currently executed. This

is to prevent getting into a loop you can't get out of!).

Notice that this script takes

no arguments

at all. You should just run it from the

command line by just using the name of the script:

bash assg6.sh

and nothing else. This is how I will be testing your script.

It also shouldn't need the user to type in any input at the keyboard.

So don't use

read

command either.

Put in enough echo statements to make the listing of information more easier to

follow.

Explanation / Answer

#!/bin/bash

dir = $(pwd)

for file in $dir

do

              $ [[ "$file" == "[[:lower:]*]" ]] && echo "File name starts with lowercase letter"

              $ [[ "$file" == "[[:upper:]*]" ]] && echo "File name starts with uppercase letter"

              $ [[ "$file" == "[[0-9]*]" ]] && echo "File name starts with a number" || echo "File name starts with some character other than alphanumeric"

              if [[-d "$file"]]

              then

                             echo "${file} is a directory"

                             conitnue

              fi

              if [[-d "$file"]]

              then

                             if [[ -r $file ] ]

                             then

                                           if [[ -x $file ] ]

                                           then

                                                          if [ "$file" = $0 ]

                                                          then

                                                                        echo "${file} is not executable"

                                                                        continue

                                                          else

                                                                        ./$file

                                                          fi

                                           else

                                                          cat         $file

                                                          continue

                                           fi

                             else

                                           echo "${file} is not readable"

                                           continue

                             fi

              fi   

done

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