[microblaze-uclinux] bash versus sh ?

[Paulo Ferreira <paf@xxxxxxxx>]

First of all many thanks  for  the microblaze version of linux.


I am  trying to learn how to customize linux  and the microblaze.


I am using a Spartan 3E starter kit and  ISE/EDK version 9.2 on Ubuntu  
9.04.

I know I should be using Centos, but the differences are small, and I  
managed to run all the stuff until now.


The xilinx software is working,  the prebuilt files are also working,  
the making of the "hardware" part is done ( I managed to make a  
correct download.bit file ).


Now, on the software side,  making the linux kernel, I was surprised  
by some messages like:

"declare: not found"

or

"/bin/sh:  let: not found"


It seems to me that many scripts on the petalinux distro suppose that / 
bin/sh is bash!

But in a well configured machine   /bin/sh should be the Bourne shell  
and /bin/bash should be bash.
In Ubuntu 9.04 sh  ( in reality  dash ) has 87924 bytes and  bash has  
729040 bytes so sizes are very different, and one should be clear when  
bash is needed.
In a normal desktop machine it makes no difference, but in embedded  
systems, the two numbers are very different.
Am I wrong?


So my options are:
	1) make a link  from /bin/sh to /bin/bash

        2) Make a script  called  change_sh_bash.sh and run it like  
this on the Petalinux distro:

        find $PETALINUX -type f -exec  ./change_sh_bash  {} \;

    ( But this way I will change too many files.... )
========================================================
#!/bin/bash
#
#   change_sh_bash.sh
#
  if [ "$#" != "1" ]
  then
    echo "Usage: change_sh_bash.sh  filename"
    echo "  changes scripts from sh to bash shell"
    exit 1
  fi

  if [ ! -f "${1}" ]
  then
     echo "File ${1} does not exist"
     exit 1
  fi

  HEADER=`head -c 9 ${1}`  # see the first 9 chars of the file

  TMPFILE=/tmp/chgbash$$    #  create a temp file


  if [ "${HEADER}"  == "#!/bin/sh" ]
   then
    echo "File: ${1} will be changed from sh to bash"
    cp "$1"  $TMPFILE    # for preserving permissions
    sed -e '1s/#!\/bin\/sh/#!\/bin\/bash/' "${1}" > $TMPFILE
    mv $TMPFILE  "$1"
  fi
==========================================================

Sorry, if my mail seems grumpy, that's not my intention, and I will be  
glad if the
trouble is really  on my side "between the chair and the  
keyboard".... ;-)


My best regards

Paulo Ferreira

 
 
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