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Full Discussion: Manipulating Filenames
Top Forums Shell Programming and Scripting Manipulating Filenames Post 302571218 by agama on Sunday 6th of November 2011 09:57:01 PM
Old 11-06-2011
Quote:
Originally Posted by imonkey
Thanks heaps agama that has worked a treat. I can barley understand it but I'll work on it a bit more. Quick question, why does it need to be piped to the kshell?

Not sure if your question was literally why is must be piped to a shell or if you meant must it be kshell -- would bash work. So, here are both answers:

The awk is generating the move commands, but needs kshell to execute them. It could be piped to bash, I just prefer Kshell so that's the way I tested it.

I'll add some comments to the code and maybe that will help you understand it a bit better.

---------- Post updated at 21:57 ---------- Previous update was at 21:45 ----------

Some additional info:
Code:
ls VOD[0-9]*.pdf | awk '
    NF > 1 {        # input line will have more than one field if filename has spaces
        of = $0;                    # save the original filename
        split( $NF, a, "." );       # split the last part of filename into array a using dot as seperator
        n = split( $0, b, " " );    # easy way to get all of the fields into an array
                                    # we put the fields into an array so we can treat both cases identically later
        b[n] = a[1];                # replace last field xxxx.yyyy with just xxxx
        sep = " ";                  # seperator to use when building the move to file
    }

    NF == 1 {                       # if just one field, asssume a filename without spaces
        of = $1;                    # save the original name
        split( $1, a, "." );        # split the name (xxx_yyy_zzzz.eee) on the dot xxx_yyy_zzzz goes into a[1] eee into a[2]
        n = split( a[1], b, "_" );  # split the leading lead part into array b using _ as separator
        sep = "_";                  # seperator to use when building the move to file
    }

      {                               # this block executed for all files; assumes array b has the filename components and n is the size of b
        printf( "mv \"%s\"  \"%s", of, b[n] );      # print command (mv) original name and  the last component of the name
          for( i = 2; i < n; i++ )   # starting with second component in the name print up to, but not including the last component
            printf( "%s%s", sep, b[i] );
        printf( ".%s\"\n", a[2] );      # add the extension (.xxx) and a newline
    }
' #| ksh

 

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SPLIT(1)							   User Commands							  SPLIT(1)

NAME
split - split a file into pieces SYNOPSIS
split [OPTION]... [INPUT [PREFIX]] DESCRIPTION
Output fixed-size pieces of INPUT to PREFIXaa, PREFIXab, ...; default size is 1000 lines, and default PREFIX is 'x'. With no INPUT, or when INPUT is -, read standard input. Mandatory arguments to long options are mandatory for short options too. -a, --suffix-length=N generate suffixes of length N (default 2) --additional-suffix=SUFFIX append an additional SUFFIX to file names -b, --bytes=SIZE put SIZE bytes per output file -C, --line-bytes=SIZE put at most SIZE bytes of lines per output file -d, --numeric-suffixes[=FROM] use numeric suffixes instead of alphabetic; FROM changes the start value (default 0) -e, --elide-empty-files do not generate empty output files with '-n' --filter=COMMAND write to shell COMMAND; file name is $FILE -l, --lines=NUMBER put NUMBER lines per output file -n, --number=CHUNKS generate CHUNKS output files; see explanation below -u, --unbuffered immediately copy input to output with '-n r/...' --verbose print a diagnostic just before each output file is opened --help display this help and exit --version output version information and exit SIZE is an integer and optional unit (example: 10M is 10*1024*1024). Units are K, M, G, T, P, E, Z, Y (powers of 1024) or KB, MB, ... (powers of 1000). CHUNKS may be: N split into N files based on size of input K/N output Kth of N to stdout l/N split into N files without splitting lines l/K/N output Kth of N to stdout without splitting lines r/N like 'l' but use round robin distribution r/K/N like- wise but only output Kth of N to stdout GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report split translation bugs to <http://translationproject.org/team/> AUTHOR
Written by Torbjorn Granlund and Richard M. Stallman. COPYRIGHT
Copyright (C) 2013 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO
The full documentation for split is maintained as a Texinfo manual. If the info and split programs are properly installed at your site, the command info coreutils 'split invocation' should give you access to the complete manual. GNU coreutils 8.22 June 2014 SPLIT(1)
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