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Aug 21st, 2009

Need help to write a backup script...

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Helo frndz,
I'm novice in shell scripting...I need ur frnd help to write a shell script for taking backups. This script should use cp command to take backups. Script can read the list of directories and destination directory from a file or ask user for this info interactively...

Example:
Only two options -i (for interactive run) and "-f file" (to read backup info from a file) are allowed. When an invalid option is entered, script displays a message in shown below:
$ a2backup -r
syntax: a2backup [ -i/ -f file]

$ a2backup -i
Welcome to the Interactive Backup utility
Enter the source directory [/home/maskara/sya710]:
Enter the destination directory: /home/backup
What type of backup do you want ( [i]ncremental / [f]ull backup) [i]:
Follow symbolic link (Y/N) [n]:
Directory backed up successfully...

Plz help me to do this...

...

Thnx

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baula

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Aug 21st, 2009

Re: Need help to write a backup script...

Use rsync. It already does this and has more robust command line options.

sknake

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Aug 21st, 2009

Re: Need help to write a backup script...

Sory dear SKnake, Thnx for ur reply...But I cant use any software...

it's my assignment, have to do with writing a script...

& also have to follow da above mentioned example...

...any other advise?? Do U know how to write this code?? plz help me...

Thnx again...

baula

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Aug 21st, 2009

Re: Need help to write a backup script...

Why don't you share the code you have so far so we can see what needs to be done? The incremental backup is going to be a little bit of work...

Last edited by sknake; Aug 21st, 2009 at 4:45 pm.

sknake

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Aug 21st, 2009

Re: Need help to write a backup script...

Dear sknake,
I dun have code yet...I dun understand where I've to start!...

I'm still trying to write this code...I dun understand how to initialize da OPTION value, so that da entered value (i.e, except '-i' or '-f') is invalid or not...I'm not good in programming man...

Thnx

baula

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Aug 21st, 2009

Re: Need help to write a backup script...

I'll get you started with the user input. Here is the sample output:

bash Syntax (Toggle Plain Text)
sk@sk:~/tmp$ ./ba.sh
syntax: ./ba.sh [ -i/ -f file]
sk@sk:~/tmp$ ./ba.sh -i
Welcome to the Interactive Backup utility
Enter the source directory [/home/maskara/sya710]: /ab
Enter the destination directory [/home/backup]: /dc
/ab
/dc
sk@sk:~/tmp$ ./ba.sh
syntax: ./ba.sh [ -i/ -f file]
sk@sk:~/tmp$ ./ba.sh -i
Welcome to the Interactive Backup utility
Enter the source directory [/home/maskara/sya710]: /ab
Enter the destination directory [/home/backup]: /dc
/ab
/dc

Now the actual script:

bash Syntax (Toggle Plain Text)
#!/bin/bash
 
d_srcdir="/home/maskara/sya710"
d_dstdir="/home/backup"
 
if ([ "$1" == "-i" ]); then
  echo "Welcome to the Interactive Backup utility"
  echo -n "Enter the source directory [${d_srcdir}]: "
  read srcdir
 
  if ! test $srcdir; then
    srcdir=${d_srcdir}
  fi
 
  echo -n "Enter the destination directory [${d_dstdir}]: "
  read dstdir
 
  if ! test $dstdir; then
    dstdir=${d_dstdir}
  fi
 
  echo ${srcdir}
  echo ${dstdir}
 
else
  echo "syntax: ${0} [ -i/ -f file]"
fi
#!/bin/bash

d_srcdir="/home/maskara/sya710"
d_dstdir="/home/backup"

if ([ "$1" == "-i" ]); then
  echo "Welcome to the Interactive Backup utility"
  echo -n "Enter the source directory [${d_srcdir}]: "
  read srcdir

  if ! test $srcdir; then
    srcdir=${d_srcdir}
  fi

  echo -n "Enter the destination directory [${d_dstdir}]: "
  read dstdir

  if ! test $dstdir; then
    dstdir=${d_dstdir}
  fi

  echo ${srcdir}
  echo ${dstdir}

else
  echo "syntax: ${0} [ -i/ -f file]"
fi

sknake

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Sep 3rd, 2009

Re: Need help to write a backup script...

Dear sknake,

Sorry for long late reply...Thank you very much...It was really very helpful!...

Thnx again...

baula

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