Shell Programming and Scripting

 
#!/bin/bash
 
file1=$(date '+%Y%m%d')
file2=$(date -d "1 day ago" '+%Y%m%d')
file1=$file1"_file.txt"
file2=$file2"_file.txt"
diff $file1 $file2

cat compare_fles.ksh
A=$1
B=$2
awk -vC=`echo $A` -vD=`echo $B` 'BEGIN{gsub(/\_.*/,X,C);gsub(/\_.*/,X,D);if(C == D){print "Files are of same date."} else {print "Files are NOT same date."}}'

./compare_fles.ksh 20141201_file.txt 20141130_file2.txt

Files are NOT same date.

DATE1=$1
NAME1=`echo $DATE1 | awk '{gsub(/\-/,X,$0);print $0}'`
VALUE=`find -type f -name "$NAME1""_file.txt"`
if [[ -n $VALUE ]]
then
        echo "File named" "$NAME1""_file.txt" "has been found."
else
        echo "File named" "$NAME1""_file.txt" "has NOT been found."
fi

./check_date12.ksh 2014-11-30

File named 20141130_file.txt has been found.

./check_date12.ksh 2014-15-30

File named 20141530_file.txt has NOT been found.

DATE=`date`
DATE1=`date -d"1 day ago"`
value1=`find -type f -name"$DATE""file.txt"`
value=`find -type f -name"$DATE1""file.txt"`
if [[ -n $value && -n value1 ]]
then
 diff $value $value1
else
 echo "Either file named " "$value1" " OR file named " "$value" " has NOT been found."
fi