Shell Programming and Scripting

if [ -e filename]; then
echo "file exists"
else
echo "file not exists"
fi

#!/bin/sh

hostname=abc@server

if [ -n `ssh $hostname 'ls /home/user/file 2>/dev/null'` ]; then
        echo file exists
else
        echo "file doesn't exist"
fi

. /opt/etl/bin/.etl_profile.ksh
# echo "the variable is:" $3COM_SFTP_ACTN

Tcomdta=/var/opt/etl/datsrc/3com/data
Tcomtmp=/var/opt/etl/datsrc/3com/temp
Tcomlog=/var/opt/etl/datsrc/3com/log
logdate=`date +%Y%m%d%H%M%S`;
logfilenm=$Tcomlog/"3com_FTP_$logdate.log"
FILE="3Com_*"
maillist=`eval echo $TCOM_MAIL_LIST`

#----Log Errors in Log File---------#

err() {
 echo "ERROR: $@"  >> $logfilenm
        exit 1
}

#-----Move input file(s) from SFTP Server to 3com folder-------#

cd $Tcomtmp


echo Log BEGIN For $logdate>$logfilenm
>$Tcomtmp/file.dat


sftp -b - $TCOM_SFTP_ACTN << EOF >$logfilenm
mget /$FILE
quit
EOF

comdta=/var/opt/etl/datsrc/3com/data
cominp=/var/opt/etl/datsrc/3com/input
comtmp=/var/opt/etl/datsrc/3com/temp
comlog=/var/opt/etl/datsrc/3com/log
logdate=`date +%Y%m%d%H%M%S`;
lognm="3com_FTP_$logdate.log"
trgr_file="3Com_Files_Delivered.txt"
infile="3Com_*"
maillist=`eval echo $TCOM_MAIL_LIST`
flag="N"


####################################################################
#
#REMOVING LOG FILES OLDER THAN 30 DAYS
#
####################################################################

find $comlog -type f -name '3com_FTP_*.log' -follow -mtime +30 -exec rm {} \; -print


#----Log Errors in Log File---------#

inf_log()
{
	echo "INFO: $@"  >> $comlog/$lognm
}

err()
{
	echo "ERROR: $@"  >> $comlog/$lognm
	exit 1
}


#######################################################################
#
# FTP PROCESS To check the existence of the trigger file every 5 min
# and if exist move all the input files from SFTP Server to 3com folder
#
#######################################################################


cd $cominp


echo Log BEGIN For $logdate>$comlog/$lognm


while [ "$flag" != "Y" ]
do
sftp -b - $TCOM_SFTP_FILES <<EOF >$comlog/$lognm
get /$trgr_file
bye
EOF

if [[ -f $trgr_file ]]; then
inf_log "Trigger File Exist on SFTP Server........."
inf_log "Copying 3Com Files Started.........."
sftp -b - $TCOM_SFTP_FILES <<EOF >$comlog/$lognm
mget /$infile
bye
EOF
flag='Y'
else
sleep 300
fi
done

#--------Now copying Plan,Pipeline,Forecast file(s) from input to data directory-------#

cp 3Com_Plan* $comdta
cp 3Com_Pipeline* $comdta
cp 3Com_Forecast* $comdta


#-------Mail SFTP status----------------------------#

grep -q 'Fetching' $comlog/$lognm

if [ $? -eq 0 ]; then
	inf_log "SFTP File Transfer Success!!!"
else
	echo "SFTP File Trasnsfer Failed\n"|mailx -s "3COM File Transfer Failed -ERROR" $maillist
	err " SFTP file transfer Failed - File is not Found!!!"
	exit 1
fi



#-------Remove input file(s) from SFTP Server-------#

sftp -b - $TCOM_SFTP_FILES <<EOF >>$comlog/$lognm
cd /
rm $infile
quit
EOF



#-------Notifying SFTP File(s) Removal Status-------#

grep -q 'not found' $comlog/$lognm
if [ $? -eq 0 ]; then
	err " Removal of 3Com File(s) from SFTP Box Failed!!!"
else
	inf_log " Removal of 3Com File(s) from SFTP Box is Success!!!"
	exit 0
fi