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Full Discussion: Removing lines from a file
Top Forums Shell Programming and Scripting Removing lines from a file Post 303013320 by Don Cragun on Monday 19th of February 2018 03:11:56 PM
Old 02-19-2018
You have started well over 300 threads in the last seven years. You know what is needed for us to be able to help you efficiently:
  1. The operating system you're using (which you have not provided).
  2. The shell you're using (which you have provided).
  3. Names of files to be processed (which you have not provided).
  4. A clear statement of what you're tying to do (which you have not provided).
  5. A representative sample input file (which you have not provided).
  6. The output that you hope will be produced from your sample input (which you have not provided).
  7. The code that you have tried to solve this problem on your own (which you have not supplied). And any output (normal and diagnostic) produced by the code you have tried.
Please add another post to this thread filling in the missing information!

Note that you have said you want to remove files; but you have not made it clear whether that means that you want to physically remove files from your system, you just want to remove the names of those files from the file containing your list of filenames, or you just want to exclude those files while you process other filenames contained in file containing your list of filenames in a loop in your bash shell script.

Please don't make us guess at what you're trying to do. Tell us up front so we don't all waste our time suggesting solutions to problems unrelated to what you're trying to do.
This User Gave Thanks to Don Cragun For This Post:
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LEARN ABOUT REDHAT

prunehistory

PRUNEHISTORY(8) 					      System Manager's Manual						   PRUNEHISTORY(8)

NAME

       prunehistory - remove file names from Usenet history file

SYNOPSIS

       prunehistory [ -f filename ] [ -p ]

DESCRIPTION

       Prunehistory  modifies  the  history(5)	text file to ``remove'' a set of filenames from it.  The filenames are removed by overwriting them
       with spaces, so that the size and position of any following entries does not change.

       Prunehistory reads the standard input.  The input is taken as a set of lines.  Blank lines and lines starting with a  number  sign  (``#'')
       are ignored.  All other lines are should consist of a Message-ID followed by zero or more filenames.

       The  Message-ID	is  used as the dbz(3) key to get an offset into the text file.  If no filenames are mentioned on the input line, then all
       filenames in the text are ``removed.''  If any filenames are mentioned, they are converted into the history file notation.  If they  appear
       in the line for the specified Message-ID then they are removed.

       Since innd(8) only appends to the text file, prunehistory does not need to have any interaction with it.

OPTIONS

       -p     Prunehistory will normally complain about lines that do not follow the correct format.  If the ``-p'' flag is used, then the program
	      will silently print any invalid lines on its standard output.  (Blank lines and comment lines are also passed through.)  This can be
	      useful when prunehistory is used as a filter for other programs such as reap.

       -f     The default name of the history file is <pathdb in inn.conf>/history; to specify a different name, use the ``-f'' flag.

HISTORY

       Written by Rich $alz <rsalz@uunet.uu.net> for InterNetNews.  This is revision 1.7, dated 1998/04/09.

SEE ALSO

       dbz(3), history(5), inn.conf(5), innd(8).

																   PRUNEHISTORY(8)
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