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Top Forums UNIX for Dummies Questions & Answers Want to remove all lines but not latest 50 lines from a file Post 302868243 by Scrutinizer on Saturday 26th of October 2013 05:16:00 PM
Old 10-26-2013
Hi Alister, that looks ingenious Smilie . I presume you mean tail -n 50000 and wc -m? Could you elaborate why the file needs be redirected read/write on stdout?

I tried it on Linux with tail -n 5 and this works fine,

But on OSX 10.9 (bash 3 and bash 4) I got:
Code:
dd: no value specified for seek

and the file ended up consisting of the last 5 lines an empty line and the last 5 lines again.

On Solaris (bash 3 and using XPG4 utilities):
Code:
dd: bad argument: "11"

On HPUX (bash 4)
Code:
0+0 records in
0+0 records out

And the file became 0 length

On AIX:
Code:
dd: 0511-056 The command parameter 11 is not correct.
Usage: dd [if=InputFile] [of=OutputFile] [cbs=Number] [fskip=Number]
          [skip=Number] [seek=Number] [count=Number] [bs=Number] [span=yes|no]
          [ibs=Number] [obs=Number] [files=Number] [conv=Parameter[, ...]]


Last edited by Scrutinizer; 10-26-2013 at 06:43 PM..
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Locale::Codes::LangFam(3pm)				 Perl Programmers Reference Guide			       Locale::Codes::LangFam(3pm)

NAME
Locale::Codes::LangFam - standard codes for language extension identification SYNOPSIS
use Locale::Codes::LangFam; $lext = code2langfam('apa'); # $lext gets 'Apache languages' $code = langfam2code('Apache languages'); # $code gets 'apa' @codes = all_langfam_codes(); @names = all_langfam_names(); DESCRIPTION
The "Locale::Codes::LangFam" module provides access to standard codes used for identifying language families, such as those as defined in ISO 639-5. Most of the routines take an optional additional argument which specifies the code set to use. If not specified, the default ISO 639-5 language family codes will be used. SUPPORTED CODE SETS
There are several different code sets you can use for identifying language families. A code set may be specified using either a name, or a constant that is automatically exported by this module. For example, the two are equivalent: $lext = code2langfam('apa','alpha'); $lext = code2langfam('apa',LOCALE_LANGFAM_ALPHA); The codesets currently supported are: alpha This is the set of three-letter (lowercase) codes from ISO 639-5 such as 'apa' for Apache languages. This is the default code set. ROUTINES
code2langfam ( CODE [,CODESET] ) langfam2code ( NAME [,CODESET] ) langfam_code2code ( CODE ,CODESET ,CODESET2 ) all_langfam_codes ( [CODESET] ) all_langfam_names ( [CODESET] ) Locale::Codes::LangFam::rename_langfam ( CODE ,NEW_NAME [,CODESET] ) Locale::Codes::LangFam::add_langfam ( CODE ,NAME [,CODESET] ) Locale::Codes::LangFam::delete_langfam ( CODE [,CODESET] ) Locale::Codes::LangFam::add_langfam_alias ( NAME ,NEW_NAME ) Locale::Codes::LangFam::delete_langfam_alias ( NAME ) Locale::Codes::LangFam::rename_langfam_code ( CODE ,NEW_CODE [,CODESET] ) Locale::Codes::LangFam::add_langfam_code_alias ( CODE ,NEW_CODE [,CODESET] ) Locale::Codes::LangFam::delete_langfam_code_alias ( CODE [,CODESET] ) These routines are all documented in the Locale::Codes::API man page. SEE ALSO
Locale::Codes The Locale-Codes distribution. Locale::Codes::API The list of functions supported by this module. http://www.loc.gov/standards/iso639-5/id.php ISO 639-5 . AUTHOR
See Locale::Codes for full author history. Currently maintained by Sullivan Beck (sbeck@cpan.org). COPYRIGHT
Copyright (c) 2011-2013 Sullivan Beck This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.18.2 2013-11-04 Locale::Codes::LangFam(3pm)
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