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Full Discussion: Delete a single record from a file
Top Forums UNIX for Dummies Questions & Answers Delete a single record from a file Post 302254803 by jim mcnamara on Wednesday 5th of November 2008 07:35:56 AM
Old 11-05-2008
Okay. Then there is no way to delete a single record in C. You have to read all the records, print the records to a tempfile (do not print the one you want to delete), then rename the tempfile. This deletes a line from a file, with no error checking.
usage: prog filename line_to_delete -- e.g., prog somefile 32
Code:
#include <stdlib.h>
#include <stdio.h>

int main(int argc, char **argv)
{
  FILE *in=fopen(argv[1], "r");
  FILE *out=fopen("tmp.tmp", "w");
  int skipme=atoi(argv[2]);
  char tmp[256]={0x0};
  int i=1;
  
  while(fgets(tmp, sizeof(tmp), in)!=NULL)
  {
  	if(i++!=skipme) fprintf(out, "%s", tmp);
  }
  fclose(in);
  fclose(out);
  rename("tmp.tmp", argv[1]);
  
  return 0;
}

 

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LEARN ABOUT XFREE86

dh_movefiles

DH_MOVEFILES(1) 						     Debhelper							   DH_MOVEFILES(1)

NAME
       dh_movefiles - move files out of debian/tmp into subpackages

SYNOPSIS
       dh_movefiles [debhelperoptions] [--sourcedir=dir] [-Xitem] [file...]

DESCRIPTION
       dh_movefiles is a debhelper program that is responsible for moving files out of debian/tmp or some other directory and into other package
       build directories. This may be useful if your package has a Makefile that installs everything into debian/tmp, and you need to break that
       up into subpackages.

       Note: dh_install is a much better program, and you are recommended to use it instead of dh_movefiles.

FILES
       debian/package.files
	   Lists the files to be moved into a package, separated by whitespace. The filenames listed should be relative to debian/tmp/. You can
	   also list directory names, and the whole directory will be moved.

OPTIONS
       --sourcedir=dir
	   Instead of moving files out of debian/tmp (the default), this option makes it move files out of some other directory. Since the entire
	   contents of the sourcedir is moved, specifying something like --sourcedir=/ is very unsafe, so to prevent mistakes, the sourcedir must
	   be a relative filename; it cannot begin with a `/'.

       -Xitem, --exclude=item
	   Exclude files that contain item anywhere in their filename from being installed.

       file ...
	   Lists files to move. The filenames listed should be relative to debian/tmp/. You can also list directory names, and the whole directory
	   will be moved. It is an error to list files here unless you use -p, -i, or -a to tell dh_movefiles which subpackage to put them in.

NOTES
       Note that files are always moved out of debian/tmp by default (even if you have instructed debhelper to use a compatibility level higher
       than one, which does not otherwise use debian/tmp for anything at all). The idea behind this is that the package that is being built can be
       told to install into debian/tmp, and then files can be moved by dh_movefiles from that directory. Any files or directories that remain are
       ignored, and get deleted by dh_clean later.

SEE ALSO
       debhelper(7)

       This program is a part of debhelper.

AUTHOR
       Joey Hess <joeyh@debian.org>

11.1.6ubuntu2							    2018-05-10							   DH_MOVEFILES(1)
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