Shell Programming and Scripting

#!/bin/bash

  
  HERE=`uname -n`    # Will I be able to add the directory here 
  THERE=bilbo         # What is this creating?
  echo "starting remote backup to $THERE at `date +%r`"
  # ==> `date +%r` returns time in 12-hour format, i.e. "08:08:34 PM".
  
  e
  rm -rf /pipe
  mkfifo /pipe       # ==> Create a "named pipe", named "/pipe".
  
 #What is this doing too?

  su xyz -c "ssh $THERE \"cat >/home/xyz/backup/${HERE}-daily.tar.gz\" < /pipe"&
  cd /

#This too?

  tar -czf - bin boot dev etc home info lib man root sbin share usr var >/pipe


  exit 0

mknod  filename_for_pipe p
mkfifo pipename

#!/bin/bash
 
 
  HERE=`uname -n`    # Stores the node name of the host server
 
  THERE=<SERVER WHERE YOU WANT TO KEEP THE BACKUP>         #Server on which you want to store the backup
 
 MYDIR=/home/users/Bashwork/Testing
  PIPE=${MYDIR}/pipe
 
  echo "starting remote backup to $THERE at `date +%r`"
  # ==> `date +%r` returns time in 12-hour format, i.e. "08:08:34 PM".
  cd ${MYDIR}
 
  rm -rf ${PIPE}
  mkfifo ${PIPE}       # ==> Create a "named pipe", named "/pipe".
 
#What is this doing too?
 ## Assuming you want to create backup from your own user, USER
 
  su ${USER} -c "ssh $THERE \"cat >/home/xyz/backup/${HERE}-daily.tar.gz\" < ${PIPE}"&
 
 
  cd /
 
#This too?
 
  tar -czf - bin boot dev etc home info lib man root sbin share usr var >${PIPE}
 
## This is writing the new tar ball (backup of above mentioned folder) and writing on the PIPE
 
 
  exit 0

#!/bin/bash
 
  HERE=`uname -n`    # Stores the node name of the host server
 
 MYDIR=/home/users/Bashwork/Testing
  echo "starting backup at `date +%r`"
  # ==> `date +%r` returns time in 12-hour format, i.e. "08:08:34 PM".
  
  TARBALL="${MYDIR}/${HERE}-daily.tar.gz"
  
cd /
 
#This too?
 
  tar -czf - bin boot dev etc home info lib man root sbin share usr var  | gzip -9c - >${TARBALL}
 
 
  exit 0