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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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env(1)								   User Commands							    env(1)

NAME
env - set environment for command invocation SYNOPSIS
/usr/bin/env [-i | -] [name=value]... [utility [arg... ]] /usr/xpg4/bin/env [-i | -] [name=value]... [utility [arg... ]] DESCRIPTION
The env utility obtains the current environment, modifies it according to its arguments, then invokes the utility named by the utility op- erand with the modified environment. Optional arguments are passed to utility. If no utility operand is specified, the resulting environment is written to the standard output, with one name=value pair per line. /usr/bin If env executes commands with arguments, it uses the default shell /usr/bin/sh (see sh(1)). /usr/xpg4/bin If env executes commands with arguments, it uses /usr/xpg4/bin/sh (see ksh(1)). OPTIONS
The following options are supported: -i | - Ignores the environment that would otherwise be inherited from the current shell. Restricts the environment for utility to that specified by the arguments. OPERANDS
The following operands are supported: name=value Arguments of the form name=value modify the execution environment, and are placed into the inherited environment before utility is invoked. utility The name of the utility to be invoked. If utility names any of the special shell built-in utilities, the results are unde- fined. arg A string to pass as an argument for the invoked utility. EXAMPLES
Example 1 Invoking utilities with new PATH values The following utility: example% env -i PATH=/mybin mygrep xyz myfile invokes the utility mygrep with a new PATH value as the only entry in its environment. In this case, PATH is used to locate mygrep, which then must reside in /mybin. ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables that affect the execution of env: LANG, LC_ALL, LC_CTYPE, LC_MES- SAGES, and NLSPATH. PATH Determine the location of the utility. If PATH is specified as a name=value operand to env, the value given shall be used in the search for utility. EXIT STATUS
If utility is invoked, the exit status of env is the exit status of utility. Otherwise, the env utility returns one of the following exit values: 0 Successful completion. 1-125 An error occurred. 126 utility was found but could not be invoked. 127 utility could not be found. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: /usr/bin +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ |CSI |enabled | +-----------------------------+-----------------------------+ /usr/xpg4/bin +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWxcu4 | +-----------------------------+-----------------------------+ |CSI |enabled | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ SEE ALSO
ksh(1), sh(1), exec(2), profile(4), attributes(5), environ(5), standards(5) SunOS 5.11 2 Jan 2002 env(1)
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