Shell Programming and Scripting

 
#!/bin/bash
PATH1=/var/log/mysql
PATH2=/home/ankur/log
FILE1=mysql-bin.index
mysqladmin -u root -p'test!@#' flush-logs
printf "%s\n" $(comm -3 $PATH1/$FILE1 $PATH2/.FILE2)>$PATH2/.FILE3
sed -e '$d' $PATH2/.FILE3 >$PATH2/.FILE4
awk '{ a[NR]=$0 } END { for(i=NR; i; --i) print a[i] } ' $PATH2/.FILE4 > $PATH2/.FILE5
sleep 1
echo "Today is $(date)"
echo "--------------------"
for i in `cat $PATH2/.FILE5`;
do
j=(${i/*\//})
#echo "$j"
if [ ! -f $PATH2/$j ];
then cp -fr  $PATH1/$j $PATH2/$j ;
gzip -9  $PATH2/$j
echo "Copying binlogs : $j"
#else
#echo "ankur"
#cat FILE1 > FILE2
#exit 0
fi  ;
done
cat $PATH1/$FILE1 > $PATH2/.FILE2
sed -e '$d' $PATH2/.FILE2 >$PATH2/.TEMP
cat $PATH2/.TEMP>$PATH2/.FILE2
exit 0

 
#!/bin/bash
checkstatus () {
..
.
}
checkstatus;
if [ "$?" == "0" ]; then
echo STATUS=${?}
else
echo "failed"
fi
exit 0

command1 && command2 && command3
# Is similar to
if command1
then if command 2
       then command3
       fi
fi