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Full Discussion: Create files from a list and then populate them
Top Forums Shell Programming and Scripting Create files from a list and then populate them Post 302532045 by agama on Sunday 19th of June 2011 01:44:04 PM
Old 06-19-2011
Your description was somewhat confusing to me. If I understand what you want, this may get you started:

Code:
#!/usr/bin/env ksh
while read file junk
do
    touch $file
done <foo

while read junk1 file junk2
do
    if [[ -f ${file%%,*} ]]                # only if previously created
    then
        echo "$junk1 $file $junk2" >>${file%%,*}
    fi
done <bar

I avoid using constructs like for x in $(cat some-file) do because the number of lines in the file might exceed the system parm limits, and/or there might be multiple words on the file where only one of which is the desired filename. The using while read does the same thing without these dangers.

I made the assumption that lines from 'bar' were only to be placed into a newly created file if the filename existed, and the line was to be written only to the named file. Thus filea would only get the lines from bar that had filea listed as the second token.

You should be able to augment this example with proper directories etc. and please be advised that I did NOT test this code.
Last edited by agama; 06-19-2011 at 02:48 PM.. Reason: typo
 

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LEARN ABOUT SUNOS

endusershell

getusershell(3C)					   Standard C Library Functions 					  getusershell(3C)

NAME

       getusershell, setusershell, endusershell - get legal user shells

SYNOPSIS

       #include <unistd.h>

       char *getusershell(void);

       void setusershell(void);

       void endusershell(void);

DESCRIPTION

       The  getusershell()  function  returns  a  pointer  to  a  legal  user  shell  as defined by the system manager in the file /etc/shells. If
       /etc/shells does not exist, the following locations of the standard system shells are used in its place:

       /bin/bash		  /bin/csh
       /bin/jsh 		  /bin/ksh
       /bin/pfcsh		  /bin/pfksh
       /bin/pfsh		  /bin/sh
       /bin/tcsh		  /bin/zsh
       /sbin/jsh		  /sbin/pfsh
       /sbin/sh 		  /usr/bin/bash
       /usr/bin/csh		  /usr/bin/jsh
       /usr/bin/ksh		  /usr/bin/pfcsh
       /usr/bin/pfksh		  /usr/bin/pfsh
       /usr/bin/sh		  /usr/bin/tcsh
       /usr/bin/zsh		  /usr/xpg4/bin/sh

       The getusershell() function opens the file /etc/shells, if it exists, and returns the next entry in the list of shells.

       The setusershell() function rewinds the file or the list.

       The endusershell() function closes the file, frees any memory used by getusershell() and setusershell(), and rewinds the file /etc/shells.

RETURN VALUES

       The getusershell() function returns a null pointer on EOF.

BUGS

       All information is contained in memory that may be freed with a call to endusershell(), so it must be copied if it is to be saved.

SunOS 5.10							    30 Aug 2004 						  getusershell(3C)
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