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backup script
I am back.
Well this time, the task is to write a shell script do the backup on to a DLT tape (40G). But the problem is that my the directories are even bigger (this case, 2 DLT tapes are required). So what I do is list all the subdirectories in that directory recursively with their sizes so that the users can chose the total number of GB of files backed up to be less than 40 G.
I entire script is as follows which is quite long and is not entirely mine,
# weekly.backup
# making a log file
export log="/misc/csl1/temp/Unimanual1999.backup.txt"
echo '' >> $log
echo "# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #" >> $log
echo '' >> $log
echo "STARTING weekly.backup ... " >> $log
echo '' >> $log
date >> $log
echo '' >> $log
echo "- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -" >> $log
echo -n "Welcome to the weekly backup. Press 'y' to begin .... : "
echo "There is too much data on Unimanual1999 to put on to one tape, therefore,"
echo "you will need two tapes to do the backup "
echo ''
echo "You will need to put roughly half of the data on each tape, and you will"
echo "be asked to list the directories you would like to put on each tape."
echo ''
echo "Below is a list of directories within Unimaual1999 and their sizes in kilobytes."
echo "This may take a moment..."
echo ''
du --max-depth=1 /misc/csl1/Unimanual1999 > /misc/csl1/temp/Unimanual1999.backup.txt
echo ''
Directories=""
ShortDirectories=""
let total=0
continue="y"
dircounter=0
echo '' > /misc/csl1/temp/Unimanual1999.backup.txt
while [ $continue != "n" ]; do
echo ''
more /misc/csl1/temp/Unimanual1999.backup.txt
echo ''
echo "Please select a directory that you would like to back up."
echo "Copy and paste the line containing its size and name."
echo ''
echo -n ": "
read size dir
dirname=`basename $dir`
shortdir=$dir
echo ''
let temptotal=$total+$size
echo "- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -"
echo ''
echo "DIRECTORIES:"
echo ''
let k=1
until (($k > $dircounter)); do
echo "$ShortDirectories[$k]"
let k=$k+1
done
echo $shortdir
echo ''
echo "Total = $temptotal"
let tempremain=40000000-$temptotal
if (($tempremain < 0)); then
echo ''
echo "* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *"
echo "* *"
echo " YOU HAVE EXCEEDED the space available by $tempremain. "
echo "* *"
echo "* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *"
else
echo "Available = $tempremain"
fi
echo ''
echo "- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -"
echo ''
echo -n "Are you sure that you would like to add $dir? (y/n): "
read answer
if [ $answer = "y" ]; then
echo "$dirname" >> /misc/csl1/temp/Unimanual1999.backup.txt
Directories=($Directories $dir)
ShortDirectories=($ShortDirectories $shortdir)
let total=$temptotal
let remain=$tempremain
let dircounter=$dircounter+1
fi
echo ''
echo "You have approximately $remain kilobytes available."
echo ''
echo -n "Do you want to add another directory? (y/n): "
read continue
done
echo ''
echo "Please put in tape 1 for Unimanual1999"
echo -n "When the "Tape in Use" light on the DLT drive has stopped flashing, press 'Enter'."
read go
echo "" >> $log
echo "Starting Unimanual1999, tape 1" >> $log
date >> $log
mt -f /dev/st0 rewind
tar cf - $ShortDirectories | /usr/bin/rsh chaos "buffer -t -o /dev/st0
mt -f /dev/st0 rewind
echo "" >> $log
echo "$ShortDirectories" >> $log
echo '' >> $log
echo "were backed up from Unimanual1999 which currently contains the following:" >> $log
echo '' >> $log
echo "Unimanual1999" >> $log
ls -l /misc/csl1/Unimanual1999 >> $log
echo '' >> $log
df /misc/csl1/Unimanual1999 >> $log
echo ''
df /misc/csl1/Unimanual1999
echo ''
echo "Please compare the \"Total bytes written\" that was returned from the backup with"
echo "the number in the \"Used column above\". Please make sure that they are the same."
echo "Please note that the size from the backup is in bytes, and the size listed"
echo "immediately above is in kilobytes."
echo ''
echo "" >> $log
echo "Finished backing up Unimanual1999, tape 1" >> $log
date >> $log
echo "Finished backing up Unimanual1999 tape 1" > /misc/csl1/temp/dont_remove_30.1_backup.txt
echo "$ShortDirectories" >> /misc/csl1/temp/dont_remove_30.1_backup.txt
date >> /misc/csl1/temp/dont_remove_30.1_backup.txt
rm /misc/csl1/temp/morefile.30.txt
echo '' >> $log
echo "- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -" >> $log
#--------------------------------------------------------> End of Script
Upon execution I face the following problems,
1. The directories are not listed for me to chose from, is there something wrong in this line,
echo '' > /misc/csl1/temp/Unimanual1999.backup.txt
more /misc/csl1/temp/Unimanual1999.backup.txt
2.After I select some directory (since I know them, even though they are not displayed) the messages displayed are,
Please select a directory that you would like to back up.
Copy and paste the line containing its size and name.
:
(case 1# If I enter nothing, then I get)
basename: too few arguments
Try `basename --help' for more information.
BackupScript: let: temptotal=0+: syntax error: operand expected (error token is "+")
(case 2# If I enter, then I get)
Total =
BackupScript: let: tempremain=40000000-: syntax error: operand expected (error token is "-")
BackupScript: ((: < 0: syntax error: operand expected (error token is "< 0")
Available =
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
DIRECTORIES:
[1]
Total = 0
Available = 40000000
3. Then I get a prompt,
Are you sure that you would like to add ? (y/n): y
BackupScript: let: total=: syntax error: operand expected (error token is "=")
BackupScript: let: remain=: syntax error: operand expected (error token is "=")
You have approximately kilobytes available.
Do you want to add another directory? (y/n): n
4. Finally,
Please put in tape 1 for Unimanual1999
When the Tape in Use light on the DLT drive has stopped flashing, press 'Enter'. (I press Enter)
BackupScript: line 141: unexpected EOF while looking for matching `"'
BackupScript: line 142: syntax error: unexpected end of file
I am extremely sorry for giving you such a long footage, but since I am new to this, I would be most helpful if someone can help me debug codes.
Thanks again in advance,
~ Nishant
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It would appear that you have placed an awful lot of responsibility for backups on the users. You might want to look into kbackup. Among other things, it can create compressed archives, which might cutdown your backup requirements to one tape. Take a look here. -mk
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If it ain't broke,
Fix it till it is.
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You could also change "tar cf" to "tar zcf" to enable compression.
[This message has been edited by Murmandamus (edited 12-03-2001).]
