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Full Discussion: Remove the last 15 characters of a filename with respect to leave file extension
Top Forums Shell Programming and Scripting Remove the last 15 characters of a filename with respect to leave file extension Post 302881321 by Don Cragun on Saturday 28th of December 2013 02:58:18 AM
Old 12-28-2013
The following shell and awk script can search for files matching your pattern in a given directory (by uncommenting the ls command on the 3rd line of the script), in a file hierarchy rooted in one or more given directories (by uncommenting the find command on the 5th line of the script), or by piping a list of pathnames to be processed into the script on standard input. This script will not work if any pathname to be processed contains a <newline> character or a <double-quote> character; other than that it should handle just about regular file you throw at it. This turned out to be more complex than I expected when I first started. (Mostly getting the args right when printing commands to print informational messages.) It uses ls, find, or some other source you provide to get a list of pathnames to be processed, awk to massage the last filename in each pathname and create mv statements to be executed by a shell, and a shell to actually rename the files. (Currently it just prints the mv commands to be executed. When you have convinced yourself that it does what you want it to do, remove the echo marked in red to actually move the files.
Code:
#!/bin/ksh
# Uncomment the following line to process files in the current directory:
# ls *-[[]YT-f22][[]???????????].* |
# Uncomment the following line to process files in and under the current directory:
# find . name '*-[[]YT-f22][[]???????????].*' |
awk '
{       # Save the directory name and remove it from the input line:
        if(match($0, /.*\//)) {
                dir = substr($0, 1, RLENGTH)
                $0 = substr($0, RLENGTH + 1)
        } else  dir = ""
        if(!match($0, /-[[]YT[-]f22][[]...........]/)) {
                printf("printf \"unexpected filename: \\\"%%s\\\" skipped\\n\" \"%s\"\n",
                        dir $0)
                next
        }
        # Save the filename extension and the base filename
        base = substr($0, 1, RSTART - 1)
        ext = substr($0, RSTART + RLENGTH)
        # Split base on strings of non-alphanumeric characters:
        n = split(base, ans, /[^[:alnum:]]*/)
        # Construct the new pathname:
        new = dir ans[1]
        for(i = 2; i <= n; i++) 
                new = new "-" ans[i]
        new = new ext
        printf("echo mv \"%s\" \"%s\"\n", dir $0, new)
}' | ksh

I tested it with bash and ksh. It should also work with an old Bourne shell or any other shell that recognizes basic Bourne shell syntax.

If you want to run this on a Solaris/SunOS system, use /usr/xpg4/bin/awk, /usr/xpg6/bin/awk, or nawk instead of the default /usr/bin/awk.
 

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LEARN ABOUT DEBIAN

paps

PAPS(1) 						      General Commands Manual							   PAPS(1)

NAME

       paps - UTF-8 to PostScript converter using Pango

SYNOPSIS

       paps [options] files...

DESCRIPTION

       paps reads a UTF-8 encoded file and generates a PostScript language rendering of the file. The rendering is done by creating outline curves
       through the pango ft2 backend.

OPTIONS

       These programs follow the usual GNU command line syntax, with long options starting with  two  dashes  (`-').   A  summary  of  options	is
       included below.

       --landscape
	      Landscape output. Default is portrait.

       --columns=cl
	      Number of columns output. Default is 1.
	      Please notice this option isn't related to the terminal length as in a "80 culums terminal".

       --font=desc
	      Set the font description. Default is Monospace 12.

       --rtl  Do right to left (RTL) layout.

       --paper ps
	      Choose paper size. Known paper sizes are legal, letter and A4. Default is A4.

       Postscript points
	      Each postscript point equals to 1/72 of an inch. 36 points are 1/2 of an inch.

       --bottom-margin=bm
	      Set bottom margin. Default is 36 postscript points.

       --top-margin=tm
	      Set top margin. Default is 36 postscript points.

       --left-margin=lm
	      Set left margin. Default is 36 postscript points.

       --right-margin=rm
	      Set right margin. Default is 36 postscript points.

       --gutter-width=gw
	      Set gutter width. Default is 40 postscript points.

       --help Show summary of options.

       --header
	      Draw page header for each page.

       --markup
	      Interpret the text as pango markup.

       --lpi  Set the lines per inch. This determines the line spacing.

       --cpi  Set the characters per inch. This is an alternative method of specifying the font size.

       --stretch-chars
	      Indicates  that  characters  should be stretched in the y-direction to fill up their vertical space. This is similar to the texttops
	      behaviour.

AUTHOR

       paps was written by Dov Grobgeld <dov.grobgeld@gmail.com>.

       This manual page was written by Lior Kaplan <kaplan@debian.org>, for the Debian project (but may be used by others).

								  April  17, 2006							   PAPS(1)
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