How to walk through a config file with /bin/sh Post: 302347952

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Top Forums Shell Programming and Scripting How to walk through a config file with /bin/sh Post 302347952 by smhaller on Thursday 27th of August 2009 03:29:52 AM

08-27-2009

Registered User

Hi zaxxon,

thanks for your answer and your help trying to get the goal.

My problem is not, to exchange value "a" with value "b", but the interactive part above. The example there is how the prompts should look like. but doing this with a "while read" loop fails.

This is what I've created:

Code:

while read line
do
  comment=`echo $line | sed -e 's/#.*/#/'`
  if [ $comment = "#" ]; then
      echo "$line" | sed -n 's/#.*/&/p' >>$tmpfile
  else
     cf_key=`echo $line | awk 'BEGIN {FS = "="} {print $1}'`
     cf_val=`echo $line | awk 'BEGIN {FS = "="} {print $2}'`
     printf "Set $cf_key - Actual ($cf_val): \n"
     read value
     if [ $value = "" ]; then
        echo "$cf_key=$cf_val" >>$tmpfile
     else
        echo "$cf_key=$value" >>$tmpfile
     fi
  fi 
done < $config

Running this will result in several lines of output on screen, but no input reading prompt (read value, get ignored).
My question is: Is there another way to get this working?

The for-loop is not an option as I've written at the begin, because it does'nt handle the file line by line (whitespace problem). Except if ther's a way to advise the for-loop to ignore the whitespace. I've alread played around with setting of IFS, but I didn't come any further.

Best regards,
Stefan

smhaller

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echo

echo(1) 						      General Commands Manual							   echo(1)

NAME

       echo - echo (print) arguments

SYNOPSIS

       [arg] ...

DESCRIPTION

       writes  its  arguments  separated by blanks and terminated by a new-line on the standard output.  It also understands C-like escape conven-
       tions; beware of conflicts with the shell's use of

	      write an alert character
	      backspace
	      print line without appending a new-line
	      form-feed
	      new-line
	      carriage return
	      tab
	      vertical tab
	      backslash
	      the 8-bit character whose
			ASCII code is the 1-, 2-, 3- or 4-digit octal number n, whose first character must be a zero.
	      write an 8-bit value that is the zero-, one-, two- or three-digit octal number
			num

       is useful for producing diagnostics in command files and for sending known data into a pipe.

   Notes
       Berkeley differs from this implementation.  The former does not implement the backslash escapes.  However, the semantics of the escape  can
       be obtained by using the option.  The echo command implemented as a built-in function of follows the Berkeley semantics (see csh(1)).

EXTERNAL INFLUENCES

   Environment Variables
       determines the interpretation of arg as single and/or multi-byte characters.

       If is not specified in the environment or is set to the empty string, the value of is used as a default for each unspecified or empty vari-
       able.  If is not specified or is set to the empty string, a default of "C" (see lang(5)) is used instead  of  If  any  internationalization
       variable contains an invalid setting, behaves as if all internationalization variables are set to "C".  See environ(5).

   International Code Set Support
       Single- and multi-byte character code sets are supported.

AUTHOR

       was developed by OSF and HP.

SEE ALSO

       sh(1).

BUGS

       No characters are printed after the first This is not normally a problem.

STANDARDS CONFORMANCE

																	   echo(1)