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Full Discussion: Memory/virtual space
Top Forums Shell Programming and Scripting Memory/virtual space Post 10898 by Perderabo on Friday 23rd of November 2001 08:44:46 AM
Old 11-23-2001
Re: Further information
Quote:
Originally posted by degwright
Perderabo,
Thanks for the information you have provided so far, but I have to take this further.

I have to assume from the evidence to date that the sys vars are taking up space which prevents the 'ls' command from working correctly.
Hmmm...you seem to be correct. To paraphrase a great American statesman, my previous guess is no longer operative...

If you do a "man 2 exec" and look at the errors that can occur. In particular, the kernel can return
Quote:
E2BIG - The number of bytes in the new program's argument list plus environment is greater than the system-imposed limit. This limit is at least 5120 bytes on HP-UX systems.
I assume, of course, that you will completely ignore the documented limit of 5120 and will experimentally determine the maximum you can achieve today. Smilie

So where does this leave you? If your developers develop more programs your script is going to fail. You seem to realize this. I'm not sure that you realize that an OS patch or upgrade could do the same thing.

I must expand my recommendation to you. Not only must you write code that will keep command lines under 2048 bytes, you also need to ensure that the command line plus the environment are less than 5120 bytes. I'm glad we cleared that up! Smilie

You're apparently unwilling to consider coding techniques that do not put all file names in one command line. Well, there is another approach. You could segment your project so that there are many small directories instead of one large one. This would render your code safe. But also, large directories slow unix down since they must be searched sequentially.

These really are the only options I see for you. Sorry for the bad news.
 

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LEARN ABOUT POSIX

vconsole.conf

VCONSOLE.CONF(5)						   vconsole.conf						  VCONSOLE.CONF(5)

NAME

       vconsole.conf - configuration file for the virtual console

SYNOPSIS

       /etc/vconsole.conf

DESCRIPTION

       The /etc/vconsole.conf file configures the virtual console, i.e. keyboard mapping and console font.

       The basic file format of the vconsole.conf is a newline-separated list environment-like shell-compatible variable assignments. It is
       possible to source the configuration from shell scripts, however, beyond mere variable assignments no shell features are supported,
       allowing applications to read the file without implementing a shell compatible execution engine.

       Note that the kernel command line options vconsole.keymap=, vconsole.keymap.toggle=, vconsole.font=, vconsole.font.map=,
       vconsole.font.unimap= may be used to override the console settings at boot.

       Depending on the operating system other configuration files might be checked for configuration of the virtual console as well, however only
       as fallback.

OPTIONS

       The following options are understood:

       KEYMAP=, KEYMAP_TOGGLE=
	   Configures the key mapping table of for they keyboard.  KEYMAP= defaults to us if not set. The KEYMAP_TOGGLE= can be used to configured
	   a second toggle keymap and is by default unset.

       FONT=, FONT_MAP=, FONT_UNIMAP=
	   Configures the console font, the console map and the unicode font map.  FONT= defaults to latarcyrheb-sun16.

EXAMPLE

       Example 1. German keyboard and console

       /etc/vconsole.conf:

	   KEYMAP=de-latin1
	   FONT=latarcyrheb-sun16

SEE ALSO

       systemd(1), loadkeys(1), setfont(8), locale.conf(5)

AUTHOR

       Lennart Poettering <lennart@poettering.net>
	   Developer

systemd 							    10/07/2013							  VCONSOLE.CONF(5)
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