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Full Discussion: Preserve leading white space
Top Forums Shell Programming and Scripting Preserve leading white space Post 302936619 by jgt on Thursday 26th of February 2015 05:45:28 PM
Old 02-26-2015
Code:
# bash --version                                    
GNU bash, version 3.2.17(1)-release (i586-pc-sysv5) 
Copyright (C) 2005 Free Software Foundation, Inc.   
#

Running on SCO Openserver 6.0.0 in case it makes any difference.

---------- Post updated at 05:45 PM ---------- Previous update was at 05:37 PM ----------

Success.
Code:
#!/usr/bin/bash                                                        
IFS="~"                                                                
while read -r line                                                     
do                                                                     
        IFS=                                                           
        line1=$line                                                    
        while [ "${line1:0:1}" = " "  -o "${line1:0:1}" = "     " ]    
        do                                                             
        line1=${line1:1}                                               
        done                                                           
        if [ "${line1:0:4}" = "@1,0" ]                                 
        then                                                           
        echo "if file (\"/u2/email/eps/\"+alltrim(writer)+\".eps\")"   
        echo "$line"                                                   
        echo "endif"                                                   
        else                                                           
        echo "$line"                                                   
        fi                                                             
        IS="~"                                                         
done                                                                   
#

Having the following line produced a run time error
Code:
IFS="~" while read -r line

Code:
  # ./chg.bash <d1.prg >/u1/ltrs2/d1.prg                       
./chg.bash: line 2: while: command not found                
./chg.bash: line 3: syntax error near unexpected token `do' 
./chg.bash: line 3: `do'                                    
#

 

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LEARN ABOUT POSIX

libbash

LIBBASH(7)							  libbash Manual							LIBBASH(7)

NAME

     libbash -- A bash shared libraries package.

DESCRIPTION

     libbash  is  a package that enables bash dynamic-like shared libraries. Actually its a tool for managing bash scripts whose functions you may
     want to load and use in scripts of your own.

     It contains a 'dynamic loader' for the shared libraries ( ldbash(1)), a configuration tool (ldbashconfig(8)), and some libraries.

     Using ldbash(1) you are able to load loadable bash libraries, such as getopts(1) and hashstash(1).  A bash shared library that can be  loaded
     using
     ldbash(1) must answer 4 requirments:

     1.     It must be installed in $LIBBASH_PREFIX/lib/bash (default is /usr/lib/bash).

     2.     It must contain a line that begins with '#EXPORT='.  That line will contain (after the '=') a list of functions that the library
	    exports.  I.e. all the function that will be usable after loading that library will be listed in that line.

     3.     It must contain a line that begins with '#REQUIRE='.  That line will contain (after the '=') a list of bash libraries that are
	    required for our library.  I.e. every bash library that is in use in our bash library must be listed there.

     4.     The library must be listed (For more information, see ldbashconfig(8)).

   Basic guidelines for writing library of your own:
     1.     Be aware, that your library will be actually sourced. So, basically, it should contain (i.e define) only functions.

     2.     Try to declare all variables intended for internal use as local.

     3.     Global variables and functions that are intended for internal use (i.e are not defined in '#EXPORT=') should begin with:
		  __<library_name>_
	    For example, internal function myfoosort of hashstash library should be named as
		  __hashstash_myfoosort
	    This helps to avoid conflicts in global name space when using libraries that come from different vendors.

     4.     See html manual for full version of this guide.

AUTHORS

     Hai Zaar <haizaar@haizaar.com>
     Gil Ran <ril@ran4.net>

SEE ALSO

     ldbash(1), ldbashconfig(8), getopts(1), hashstash(1) colors(1) messages(1) urlcoding(1) locks(1)

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