Shell Script to Upload to Ftp to Test Connection

The main goal of this script is to monitor FTP server. This script is an example of how to use ftp command in the bash shell. The system administrator can use this script to check if FTP server alive and upload there any data/backups.

Every time the script creates a new file, every time with different md5 sum, after script upload it to FTP server, check md5sum of both files. If md5sum same, that means that file uploaded to FTP server successfully.

Shell Script to test ftp upload

The following shell script test ftp upload:

#!/bin/bash

function usage {

echo "Usage: $0"

echo "--ftpserver "

echo "--help - this help"

exit 1

}

if [ $# -eq 0 ]; then

usage

fi

while [ $# -gt 0 ]

do

case "$1" in

--ftpserver) HOST=$2;TIMEOUT=$3;shift;;

--help) usage;;

*) break;;

esac

shift

done

if [ x$HOST = "x" ]; then

usage

fi

### Global Variables

ORIG_DIR="/tmp/"

LOG_FILE="/tmp/ftp.log"

EMAIL="info@linoxide.com"

#next function will make all checks.
function check {
#few more variables
####VARIABLES

MAXTIMEOUT=300

ORIG_FILE="check.file"

FTPTIMEOUT='20'

USERNAME="user"

FOLDER="test"

PASSWORD="password"

DATAFOLDER="somefolder"

cd $ORIG_DIR

echo -n "Creating file … "
dd if=/dev/urandom of=$ORIG_DIR/$ORIG_FILE bs=104857 count=150 > /dev/null 2>&1
echo "Done"
echo -n "Uploading file … "
ftp -inv < $LOG_FILE

open $HOST

user $USERNAME $PASSWORD

cd $FOLDER/$DATAFOLDER

binary

passive

put $ORIG_FILE

quote size $ORIG_FILE

close

bye

EOF

echo " DONE"

echo -n "Checking MD5 sum ... "

ftp -inv <> $LOG_FILE

open $HOST

user $USERNAME $PASSWORD

cd $FOLDER/$DATAFOLDER

passive

binary

quote size $ORIG_FILE

dir

quote XMD5 $ORIG_FILE

close

bye

EOF

MD5=`tail -2 $LOG_FILE | head -1 | awk '{print $2}' | tr [:upper:] [:lower:]`

ftp -in </dev/null

open $HOST

user $USERNAME $PASSWORD

cd $FOLDER/$DATAFOLDER
delete $ORIG_FILE

close

bye

EOF

MD5_ORIG=`/usr/bin/md5sum $ORIG_FILE | awk '{print $1}'`

if [ x"${MD5}" != x"${MD5_ORIG}" ]; then

RESULT=" File corrupted."

else

RESULT=" MD5 sum OK "

fi

echo $RESULT

rm $ORIG_FILE

}

check

Shell Script Output

./ftp.sh --ftpserver ftp.example.com 20

Uploading file ... DONE

Checking MD5 sum ... MD5 sum OK

Understanding the above script

#Since there will be few times of using same commands, we will create function with name usage
#This function just will show us help menu and will exit from script.

function usage {

echo "Usage: $0"

#we tell user which arguments script expect
echo "--ftpserver "

echo "--help - this help"

#since not argument of bad argument – exit from script
exit 1

}

#We check if user pass parameters to script

if [ $# -eq 0 ]; then

#if no parameters just run function usage that show help menu
usage

fi

while [ $# -gt 0 ] #if user pass some parameters we check each

do

case "$1" in #we take first argument passed by user
#if user pass –ftpserver as first parameter, so second will be ftp servername and third timeout.
--ftpserver) HOST=$2;TIMEOUT=$3;shift;;

#if user pass –help as parameter we just output help menu
--help) usage;;
#if anything else passed – just exit from script
*) break;;

esac

shift

done #finish of while loop

#if user didn't pass ftp servername – we show help menu
if [ x$HOST = "x" ]; then

usage

fi

## We will use some variables, so in next lines just putting their values.
### Global Variables

ORIG_DIR="/tmp/"

LOG_FILE="/tmp/ftp.log"

EMAIL="info@linoxide.com"

#next function will make all checks.
function check {
#few more variables
####VARIABLES

MAXTIMEOUT=300

ORIG_FILE="check.file"

FTPTIMEOUT='20'

USERNAME="user"

FOLDER="test"

PASSWORD="password"

DATAFOLDER="somefolder"
#entering temp folder
cd $ORIG_DIR

#with dd we generate 15Mb file with name from $ORIG_FILE variable and with random content.
echo -n "Creating file … "
dd if=/dev/urandom of=$ORIG_DIR/$ORIG_FILE bs=104857 count=150 > /dev/null 2>&1
echo "Done"
# This tell user that we starting to upload file
echo -n "Uploading file … "
#we use ftp command to upload file, -i turns off interactive prompting
ftp -inv < $LOG_FILE
#connect to host
open $HOST
#connect with user and password
user $USERNAME $PASSWORD
#cd to some test folder
cd $FOLDER/$DATAFOLDER
#we tell ftp server that we will use binary mode
binary
#we will use passive mode
passive
#this command copy local file to ftp server
put $ORIG_FILE
#getting size of remove file
quote size $ORIG_FILE
#closing connection
close

bye
#exit from ftp command
EOF
#telling user that upload done
echo " DONE"
#starting md5 check
echo -n "Checking MD5 sum ... "
#same as above
ftp -inv <> $LOG_FILE

open $HOST

user $USERNAME $PASSWORD

cd $FOLDER/$DATAFOLDER

passive

binary

quote size $ORIG_FILE

dir
#getting md5 of remote file
quote XMD5 $ORIG_FILE

close

bye

EOF
#getting md5sum value from log file, since it will be in upper case we convert it to lower case with tr
MD5=`tail -2 $LOG_FILE | head -1 | awk '{print $2}' | tr [:upper:] [:lower:]`

#we need to connect to remote server once more to delete file
ftp -in </dev/null

open $HOST

user $USERNAME $PASSWORD

cd $FOLDER/$DATAFOLDER
#this command delete remote file
delete $ORIG_FILE

close

bye

EOF

#with md5sum command we get md5sum of local file
MD5_ORIG=`/usr/bin/md5sum $ORIG_FILE | awk '{print $1}'`
#this line compare md5sums, and variable RESULT will contain message according to check
if [ x"${MD5}" != x"${MD5_ORIG}" ]; then

RESULT=" File corrupted."

else

RESULT=" MD5 sum OK "

fi

#this will tell user if file was uploaded successfully or not.
echo $RESULT
#deleting local file
rm $ORIG_FILE
#end of function
}
#to run function (without arguments)
check