Example 4-3 Automation using sort and uniq: Example

# The scripts finds number of files for each directory D* and reports it on the screen.

echo "Dirrectory #files #stations #expected files"

• ls -d D* | while

• read dir_name

• do

• num=`ls $dir_name/* |wc -l `

• num_uniq=`ls $dir_name/* |awk '{if(substr($0,22,1) == "_") print substr($0,18,4);else print substr($0,19,3)}' |sort |uniq |wc -l`

• echo $dir_name " " $num " " $num_uniq

• done

• echo "program is finished"