01-30-2011
remove characters from list of files
done some homework on this--
after i remove up to and including the ) i want to take newfile.txt and use that list to remove the files from a file in my the directory pwd
i have a input.txt file
cat input,txt
1)mary.jpg
12)john.jpg
100)frankkfkdf .jpg
i want to remove the characters in the beginning of the line example only up and including the )
some thing like cut -c (2-35 ) < input.txt--i assume it would return> newfile.txt
i don't know the length of the file name but it is less than 35 characters and of different lengths
newfile.txt
cat newfile,txt
ry,jpg
hn.jpg
ankkfkdf.jpg
then xargs rm < newfile.txt
here goes my example and can it be done like this
cut -c (2-35) <inputfile.txt > newfile.txt
then
xargs rm <newfile.txt--here i know is where the problem is for me
the directory or should i say file is called all_images
cat all_images
dfdfdf.jpg
dfd.jpg
is this the code
xargs all_images rm < newfile.txt
i hope this is clear
take a list of file names and remove up to and include the )
take this list of file names and delete these files from another file all_images
i really appreciate all your help
i know there are other ways to do this with spreadsheets or use sed ( really unfamilar with it but doing homework)
but unix you know is really KooL and i love working with it
peter
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LEARN ABOUT REDHAT
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)