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Full Discussion: cp command not working
Top Forums Shell Programming and Scripting cp command not working Post 302397320 by Corona688 on Sunday 21st of February 2010 08:30:00 PM
Old 02-21-2010
Quote:
Originally Posted by Geekasaurus
The cp command does not work for directories with large number of files in them. I don't know what the upper limit is; I could probably find out with a lot of research. Also, the mv and rm commands do not work either under the same circumstance.
It has nothing to do with the rm command. The limit is the size of the buffer that commandline parameters can be fit into. This applies to all commands(except certain shell builtins in certain shells).
Quote:
I suspect that the upper limit of the number of files that it can work on is 65536. I know that it is greater than 10,000 and less than 100,000. The 65536 is a SWAG number based on 26 years of Unix shell-scripting experience.
It is a "swag number" because it's a power of two, which memory is often allocated based on. It's the maximum size of the buffer for commandline arguments per process, and system-dependent.
Quote:
I cleaned up the filesystem by removing files. I had to use a for-do-done loop and remove only one file at a time; this took many hours.
You may have been interested in the xargs command. It converts things read on stdin into commandline arguments, spanning across as many executions as necessary.
Code:
# Delete everything in ./dir_containing_files
find ./dir_containing_files -type f -print0 | xargs --null rm

Quote:
The tar syntax I quoted is in the man page on my AIX box. I've been using something similar to it for more than 20 years. It works.
It works in certain situations, yes. It will probably do what the OP wants. I have my doubts that "$FILESPEC" is working the way you think it is though -- either that or AIX has a very strange implementation of tar...
 

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page_util_quote(n)					      Parser generator tools						page_util_quote(n)

__________________________________________________________________________________________________________________________________________________

NAME
page_util_quote - page character quoting utilities SYNOPSIS
package require page::util::quote ?0.1? package require snit ::page::util::quote::unquote char ::page::util::quote::quote'tcl char ::page::util::quote::quote'tclstr char ::page::util::quote::quote'tclcom char _________________________________________________________________ DESCRIPTION
This package provides a few utility commands to convert characters into various forms. API
::page::util::quote::unquote char A character, as stored in an abstract syntax tree by a PEG processor (See the packages grammar::peg::interpreter, grammar::me, and their relations), i.e. in some quoted form, is converted into the equivalent Tcl character. The character is returned as the result of the command. ::page::util::quote::quote'tcl char This command takes a Tcl character (internal representation) and converts it into a string which is accepted by the Tcl parser, will regenerate the character in question and is 7bit ASCII. The string is returned as the result of this command. ::page::util::quote::quote'tclstr char This command takes a Tcl character (internal representation) and converts it into a string which is accepted by the Tcl parser and will generate a human readable representation of the character in question. The string is returned as the result of this command. The string does not use any unprintable characters. It may use backslash-quoting. High UTF characters are quoted to avoid problems with the still prevalent ascii terminals. It is assumed that the string will be used in a double-quoted environment. ::page::util::quote::quote'tclcom char This command takes a Tcl character (internal representation) and converts it into a string which is accepted by the Tcl parser when used within a Tcl comment. The string is returned as the result of this command. BUGS, IDEAS, FEEDBACK This document, will undoubtedly contain bugs and other problems. Please report such in the category page of the Tcllib SF Trackers [http://sourceforge.net/tracker/?group_id=12883]. Please also report any ideas for enhancements you may have. KEYWORDS
page, parser generator, quoting, text processing CATEGORY
Page Parser Generator COPYRIGHT
Copyright (c) 2007 Andreas Kupries <andreas_kupries@users.sourceforge.net> page 1.0 page_util_quote(n)
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