Shell Programming and Scripting

ls -lrt c90.txt n5.txt t1.txt k3.txt h9.txt s1.txt n2.txt a123.txt

-rw-rw-r-- kkk klkl 980 Apr 26 19:00  c90.txt
-rw-rw-r-- kkk klkl 80 Apr 26 19:00  n5.txt
-rw-rw-r-- kkk klkl 12890 Apr 26 19:00  t1.txt
-rw-rw-r-- kkk klkl 890801 Apr 27 19:00  k3.txt
-rw-rw-r-- kkk klkl 9089810 Apr 27 19:00  h9.txt
-rw-rw-r-- kkk klkl 718980 Apr 27 19:00  s1.txt
-rw-rw-r-- kkk klkl 12980 Apr 27 19:00  n2.txt
-rw-rw-r-- kkk klkl 678980 Apr 27 19:00  a123.txt


wc -l c90.txt n5.txt t1.txt k3.txt h9.txt s1.txt n2.txt a123.txt


10 c90.txt 
20 n5.txt 
30 t1.txt 
40 k3.txt 
50 h9.txt 
60 s1.txt 
70 n2.txt 
80 a123.txt
360 total

c90.txt 
n5.txt 
t1.txt 
k3.txt 
h9.txt 
s1.txt 
n2.txt 
a123.txt

Out of 8 files, only 5 files with today'date then i have to get the count for only those 5 files.


Example: 
ls -lrt c90.txt n5.txt t1.txt k3.txt h9.txt s1.txt n2.txt a123.txt

-rw-rw-r-- kkk klkl 980 Apr 26 19:00  c90.txt
-rw-rw-r-- kkk klkl 80 Apr 26 19:00  n5.txt
-rw-rw-r-- kkk klkl 12890 Apr 26 19:00  t1.txt

-rw-rw-r-- kkk klkl 890801 Apr 27 19:00  k3.txt
-rw-rw-r-- kkk klkl 9089810 Apr 27 19:00  h9.txt
-rw-rw-r-- kkk klkl 718980 Apr 27 19:00  s1.txt
-rw-rw-r-- kkk klkl 12980 Apr 27 19:00  n2.txt
-rw-rw-r-- kkk klkl 678980 Apr 27 19:00  a123.txt

wc -l c90.txt n5.txt t1.txt k3.txt h9.txt s1.txt n2.txt a123.txt


10 c90.txt 
20 n5.txt 
30 t1.txt 
40 k3.txt 
50 h9.txt 
60 s1.txt 
70 n2.txt 
80 a123.txt
360 total


Based on the above, If i take the counts for the all the files i will get total is 360 but only for todays date files count is 300

#!/bin/ksh
# Usage: lctoday file...
# This script will evaluate the pathnames given as operands and use "wc -l" to
# count lines in any of them that are regular files creater or modified at or
# after midnight today.  The total number of lines found will be printed to
# standard output.

# Initialize variables:
IAm=${0##*/}                    # This script's name
tmpf=${TMPDIR:-/tmp}/today.$$   # File with timestamp set to midnight today
unset list                      # initialize list of files to process

# Verify that we have at least one operand:
if [ $# -lt 1 ]
then    printf "Usage: %s file...\n" "$IAm" >&2
        exit 1
fi

# Create a temp file with midnight this morning as its timestamp:
if ! eval $(date '+touch -t %Y%m%d0000') "$tmpf"
then    printf "%s: Could not create file marking midnight" "$IAm" >&2
        exit 1
fi

# Select regular files with today's timestamp from the given pathname operands:
for i in "$@"
do      if [ -r "$i" ] && [ -f "$i" ] && [[ ! "$i" -ot "$tmpf" ]]
        then    # We have a readable regular file that was created or modified
                # today.
                list[${#list[@]}]="$i"  # Add it to the array of files to count.
        fi
done

# We have our list, get the line count of all of the files in the list.
wc -l "${list[@]}" /dev/null | {
        # If there is more than one file in the list, the last line wc prints
        # will be a total for all files processed and the word "total".  If
        # there is only one file, the only liee wc prints will contain the
        # total for that file and the filename.  Either way, we just need to
        # save the 1st word from the last line.
        # The /dev/null operand protects us if a single file is given and its
        # pathname contains a newline character, and gets rid of a special case
        # that would be otherwise needed if no files are selected.
        while read -r count other
        do      sum=$count
        done
        # Print the total number of lines reported by wc.
        echo $sum
}

# Cleanup.  Remove the temp file we created:
rm "$tmpf"

chmod +x lctoday

./lctoday *.txt

./lctoday c90.txt n5.txt t1.txt k3.txt h9.txt s1.txt n2.txt a123.txt