Bash script deleting my files, and editing files in subdirectories question Post: 302887120

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Top Forums Shell Programming and Scripting Bash script deleting my files, and editing files in subdirectories question Post 302887120 by Chubler_XL on Wednesday 5th of February 2014 06:37:58 PM

02-05-2014

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continue just resumes at the next iteration of the enclosing for loop. In this particular code that means stop processing the current file and start processing the next file.

The current code is less than ideal as it will rename existing renamed files and skip files.

see below:

Code:

$ touch abc_{0000..0003} more/img_{0000..0003} file{000..002}.jpg
$ ls
abc_0000  abc_0001  abc_0002  abc_0003  file000.jpg  file001.jpg  file002.jpg  more  script
$ ./script file jpg
./abc_0002 -> file003.jpg
./abc_0003 -> file004.jpg
./file000.jpg -> file005.jpg
./file001.jpg -> file006.jpg
./file002.jpg -> file007.jpg
./more/img_0000 -> file008.jpg
./more/img_0001 -> file009.jpg
./more/img_0002 -> file010.jpg
./more/img_0003 -> file011.jpg
$ ls
abc_0000  file003.jpg  file005.jpg  file007.jpg  file009.jpg  file011.jpg  script
abc_0001  file004.jpg  file006.jpg  file008.jpg  file010.jpg  more

This slight update should be a little safer.

Code:

(( $# == 2 )) || {
        printf 'Usage: %s <prefix> <ext>\n' "$0"
        exit 1
}

prefix=$1
type=$2
number=1

find . -type f -print | while read file; do

        # skip already processed files
        [[ "$file" = ./$prefix[0-9][0-9][0-9].$type ]] && continue

        # skip executable files (eg this script)
        [ -x "$file" ] && continue

        # find next unused sequence
        while true
        do
            printf -v new '%s%03d.%s' "$prefix" $((++number)) "$type"
            [ -f "$new" ] || break
        done

        mv "$file" "$new"
        echo "$file -> $new"

done

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wrjpgcom

WRJPGCOM(1)						      General Commands Manual						       WRJPGCOM(1)

NAME

       wrjpgcom - insert text comments into a JPEG file

SYNOPSIS

       wrjpgcom [ -replace ] [ -comment text ] [ -cfile name ] [ filename ]

DESCRIPTION

       wrjpgcom  reads the named JPEG/JFIF file, or the standard input if no file is named, and generates a new JPEG/JFIF file on standard output.
       A comment block is added to the file.

       The JPEG standard allows "comment" (COM) blocks to occur within a JPEG file.  Although the standard doesn't actually define what COM blocks
       are  for,  they	are  widely used to hold user-supplied text strings.  This lets you add annotations, titles, index terms, etc to your JPEG
       files, and later retrieve them as text.	COM blocks do not interfere with the image stored in the JPEG file.  The maximum  size	of  a  COM
       block is 64K, but you can have as many of them as you like in one JPEG file.

       wrjpgcom  adds a COM block, containing text you provide, to a JPEG file.  Ordinarily, the COM block is added after any existing COM blocks;
       but you can delete the old COM blocks if you wish.

OPTIONS

       Switch names may be abbreviated, and are not case sensitive.

       -replace
	      Delete any existing COM blocks from the file.

       -comment text
	      Supply text for new COM block on command line.

       -cfile name
	      Read text for new COM block from named file.

       If you have only one line of comment text to add, you can provide it on the command line with -comment.	The  comment  text  must  be  sur-
       rounded with quotes so that it is treated as a single argument.	Longer comments can be read from a text file.

       If  you	give neither -comment nor -cfile, then wrjpgcom will read the comment text from standard input.  (In this case an input image file
       name MUST be supplied, so that the source JPEG file comes from somewhere else.)	You can enter multiple lines, up to 64KB worth.   Type	an
       end-of-file indicator (usually control-D) to terminate the comment text entry.

       wrjpgcom  will  not  add a COM block if the provided comment string is empty.  Therefore -replace -comment "" can be used to delete all COM
       blocks from a file.

EXAMPLES

       Add a short comment to in.jpg, producing out.jpg:

	      wrjpgcom -c "View of my back yard" in.jpg > out.jpg

       Attach a long comment previously stored in comment.txt:

	      wrjpgcom in.jpg < comment.txt > out.jpg

       or equivalently

	      wrjpgcom -cfile comment.txt < in.jpg > out.jpg

SEE ALSO

       cjpeg(1), djpeg(1), jpegtran(1), rdjpgcom(1)

AUTHOR

       Independent JPEG Group

								   15 June 1995 						       WRJPGCOM(1)