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Full Discussion: How to shorten my code?
Top Forums UNIX for Dummies Questions & Answers How to shorten my code? Post 302872219 by Scrutinizer on Friday 8th of November 2013 02:52:49 AM
Old 11-08-2013
Another way to do the loop, that would not involve the cut statement:
Code:
while IFS=, read _ _ _ i _
do

done < "$PAYROLL"



--
Quote:
Originally Posted by bakunin
[..] you should not use a "for"-loop for a possibly long list, because the expansion will let the resulting line (after evaluation of the backticks) grow and shell command lines have a certain maximum length (see the "MAX_LIN" kernel constant).
The for loop is an internal compound shell command that is part of the shell syntax and it does not suffer from these limits..

Quote:
There shall be no limit on the size of any shell command other than that imposed by the underlying system (memory constraints, {ARG_MAX}, and so on).
Shell Commands

ARG_MAX is the maximum length of arguments for a new process and that is not the case here.

Even in cases where the shell calls an external program and tries to pass too many elements, then it is not the shell that imposes this limit. It only delivers the error message...
 

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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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