piping to script

[csstudent123]

$ ls -la | myScript.sh

How can I using sed do the following?

1. Total number of lines read.
2. Total number of different users (owners).
3. Total number of files with execute permission for the owner.
4. The top 3 largest directory.

I just need some hints.

here is my code for 1.

#!/bin/bash
Read line

while(line)
	
	do

		echo -n "$line"
		count=$((count+1))
		sed 

	done   

echo "Total lines read: $((count-1))"

thanks

[ne555]

if you didn't realise it yet, this is a c++ forum. You may have better responses if you use another website.

> exemplary usage of sed
but you don't use `sed' in your snip.

> 1. Total number of lines read.
wc

> 2. Total number of different users (owners).
cut
sort
uniq
wc

> 3. Total number of files with execute permission for the owner.
perhaps you may use `find . -maxdepth 1 -executable'
you can also use `cut --characters=4' and then grep for 'x'

> 4. The top 3 largest directory.
`ls' does not provide the size of directories, you may use `du' for that

[csstudent123]

thanks, can you tell me pls why I am getting blank if I do this

#!/bin/bash

while(read line)
	
	do

		echo "$line"		
		count=$((count+1))
		
		

	done    

echo "Total lines read: $((count-1))"

[ne555]

Because of the meaning of parenthesis. http://www.tldp.org/LDP/abs/html/subshells.html

A command list embedded between parentheses runs as a subshell.
Variables in a subshell are not visible outside the block of code in the subshell.

while read line

[csstudent123]

thanks