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Top Forums Shell Programming and Scripting Multithreading - Calling user function with xargs in korn shell Post 302809449 by luhah on Sunday 19th of May 2013 11:53:37 PM
Old 05-20-2013
Multithreading - Calling user function with xargs in korn shell

I know there are other ways of accomplishing the below task, but the purpose of this thread is to understand the below code.

I wanted to use xargs with user defined function in korn shell. Am aware, that I could write custom function into a script and place it in FPATH and then call it in xargs, but I wanted to have it all in the same shell script. Bash isnt an option for me at the moment. After 2-3 days of searching, I found the solution which works, but am unable to understand a part of it..

Code:
cat ordernum.txt | xargs -P 25 -n 1 ksh -c '
  function fun { 
    do some processing
  } 
  shift "$1" 
  fun "$@"' 2 1

Can someone help me with the last two lines of the code.

Thanks a ton.

Last edited by luhah; 05-20-2013 at 04:23 AM.. Reason: Please use code tags
 

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shell(1F)							   FMLI Commands							 shell(1F)

NAME
shell - run a command using shell SYNOPSIS
shell command [command] ... DESCRIPTION
The shell function concatenate its arguments, separating each by a space, and passes this string to the shell ($SHELL if set, otherwise /usr/bin/sh). EXAMPLES
Example 1: A sample output of shell command. Since the Form and Menu Language does not directly support background processing, the shell function can be used instead. `shell "build prog > /dev/null &"` If you want the user to continue to be able to interact with the application while the background job is running, the output of an exe- cutable run by shell in the background must be redirected: to a file if you want to save the output, or to /dev/null if you don't want to save it (or if there is no output), otherwise your application may appear to be hung until the background job finishes processing. shell can also be used to execute a command that has the same name as an FMLI built-in function. NOTES
The arguments to shell will be concatenate using spaces, which may or may not do what is expected. The variables set in local environments will not be expanded by the shell because "local" means "local to the current process." ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
sh(1), attributes(5) SunOS 5.10 5 Jul 1990 shell(1F)
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