Bash code to create named Pipe


 
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# 1  
Old 01-28-2012
Bash code to create named Pipe

Guy's,

I need help with creating a pipe, I found this code online but not exactly sure what different parts are doing.

Will someone be able to help me with explaining what code is doing?

Also what I want is to have everything the same directory. Meaning I am working in directory:
Quote:
Home/users/Bashwork/Testing
I want to keep everything in Testing directory.

Code:
#!/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

Thanks
# 2  
Old 01-29-2012
It is making a tar archive on a remote location.

Is that what you want?... If you tell us what you are trying to do, we can cut to solving your problem much faster. For example, do you have to have a named pipe?

Look into the
Code:
mknod  filename_for_pipe p
mkfifo pipename

commands

Last edited by jim mcnamara; 01-29-2012 at 02:53 PM..
# 3  
Old 01-29-2012
I have temporary file and I want to create a backup pipe file which will allow me to process the file without loosing anything.
Quote:
It is making a tar archive on a remote location.
Can I change the remote location to a location that I want?


Is using pipe the right thing when processing temporary files?

Thanks
# 4  
Old 01-30-2012
Quote:
Originally Posted by INHF
Guy's,

I need help with creating a pipe, I found this code online but not exactly sure what different parts are doing.

Will someone be able to help me with explaining what code is doing?

Also what I want is to have everything the same directory. Meaning I am working in directory:
I want to keep everything in Testing directory.

Thanks
Code:
#!/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

This User Gave Thanks to knight_eon For This Post:
# 5  
Old 01-30-2012
Quote:
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
Do I need to store node name of the host server?

Can I keep the backup in the same directory that I am working on?

Thank you all again
# 6  
Old 01-30-2012
Quote:
Originally Posted by INHF
Do I need to store node name of the host server?

Can I keep the backup in the same directory that I am working on?

Thank you all again

If you want to keep the backup in the same directory and that means same server, why u want to create pipes and all?

It can be easily accomplish by simple tar and gzip command.

it will be much easier doing this:

Code:
#!/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

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