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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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LEARN ABOUT OPENSOLARIS

split

split(1)							   User Commands							  split(1)

NAME

       split - split a file into pieces

SYNOPSIS

       split [-linecount | -l linecount] [-a suffixlength]
	    [file [name]]

       split [-b n | nk | nm] [-a suffixlength] [file [name]]

DESCRIPTION

       The  split  utility reads file and writes it in linecount-line pieces into a set of output-files. The name of the first output-file is name
       with aa appended, and so on lexicographically, up to zz (a maximum of 676 files). The maximum length of name is 2 characters less than  the
       maximum	filename length allowed by the filesystem. See statvfs(2). If no output name is given, x is used as the default (output-files will
       be called xaa, xab, and so forth).

OPTIONS

       The following options are supported:

       -linecount | -l linecount

	   Number of lines in each piece. Defaults to 1000 lines.

       -a suffixlength

	   Uses suffixlength letters to form the suffix portion of the filenames of the split file. If -a is not  specified,  the  default  suffix
	   length  is  2. If the sum of the name operand and the suffixlength option-argument would create a filename exceeding NAME_MAX bytes, an
	   error will result; split will exit with a diagnostic message and no files will be created.

       -b n

	   Splits a file into pieces n bytes in size.

       -b nk

	   Splits a file into pieces n*1024 bytes in size.

       -b nm

	   Splits a file into pieces n*1048576 bytes in size.

OPERANDS

       The following operands are supported:

       file    The path name of the ordinary file to be split. If no input file is given or file is -, the standard input will be used.

       name    The prefix to be used for each of the files resulting from the split operation. If no name argument is given, x will be used as the
	       prefix  of  the	output	files.	The  combined  length of the basename of prefix and suffixlength cannot exceed NAME_MAX bytes. See
	       OPTIONS.

USAGE

       See largefile(5) for the description of the behavior of split when encountering files greater than or equal to 2 Gbyte ( 2^31 bytes).

ENVIRONMENT VARIABLES

       See environ(5) for descriptions of the following environment variables that affect the execution of split: LANG, LC_ALL, LC_CTYPE,  LC_MES-
       SAGES, and NLSPATH.

EXIT STATUS

       The following exit values are returned:

       0     Successful completion.

       >0    An error occurred.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWesu			   |
       +-----------------------------+-----------------------------+
       |CSI			     |Enabled			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Committed 		   |
       +-----------------------------+-----------------------------+
       |Standard		     |See  standards(5).	   |
       +-----------------------------+-----------------------------+

SEE ALSO

       csplit(1), statvfs(2), attributes(5), environ(5), largefile(5), standards(5)

SunOS 5.11							    16 Apr 1999 							  split(1)
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