Bash shell scripting doubts

[livingsword]

i have just started out scripting and have some doubts ,

1) How do i print the file access permission(FAP) for all the type of users ??

2) how to search for files with same name in current directory ?

3) how do i validate a blank user input ? like if user doesnt enter any values and presses Enter, what condition do i put in an If construct ?

4) how to check what files were created today ? ls shows only the last modification date.

thnx for reading the post.

[Franklin52]

It's against the rules to post homework here.
Google on "howto bash scripting"

Regards

[livingsword]

It's against the rules to post homework here.
Google on "howto bash scripting"

Regards

this isnt a homework question. i found some good tutorials but i prefer practical advice on these questions.

[Franklin52]

Ok, what have you tried so far?
And what goes wrong?

Regards

[livingsword]

Ok, what have you tried so far?
And what goes wrong?

Regards

well, by some research and trial n error i have solved most of the doubts to an extent ,

1)for the FAP problem , i did this,

echo -n "Enter Filename : " ; read fname ;

# check if file exists
if [ -e $fname ]
then
	 
#display fap for owner 

	echo "Owner"

	ls -l $fname|awk  '{print $1 }' |tee temp | cut -c2-4

#display fap for group users
	
	echo "Group"

	cat temp | cut -c5-7

#display fap for other users

	echo "Other"
	
	cat temp | cut -c8-10
else
	echo "FIle does not exist"
fi

the output is :

Owner 
rwx
Group
r-x
Others
r--

Now, this is an acceptable output , but i want to print the words "Read" "Write" "Execute" instead of 'rwx'. If it were only for the owner , i could use the test command and -r, -w, -x options but that doesnt work for Group and Other users, how do i do that ?

[Franklin52]

An example:

#!/bin/sh

Permission()
{

for((i=0; i<3; i++))
  do
  case ${perm:i:1} in
    "r")
      printf "Read\t"
      ;;
    "w")
      printf "Write\t"
      ;;
    "x")
      printf "Execute\t"
      ;;
    esac
  done

  echo

}

echo -n "Enter Filename : " ; read fname

if [ ! -e $fname ] ; then
  echo File $fname does not exist
  exit 1
fi

fileperm=`ls -l $fname`

# I don't use a loop here to show the use of substrings
# The function Permission is called 3 times

echo Owner
perm=${fileperm:1:3}
Permission

echo Group
perm=${fileperm:4:3}
Permission

echo Others
perm=${fileperm:7:3}
Permission

exit 0

I've use a function to print out the permissions.
It's not an easy example for a beginner but spend some time to find out how it works, go here for some tutorials:

http://www.tldp.org/LDP/Bash-Beginne...tml/index.html
http://tldp.org/LDP/abs/html

Regards