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Full Discussion: Almost -> Hello World!
Top Forums Programming Almost -> Hello World! Post 302450931 by agama on Saturday 4th of September 2010 09:24:48 PM
Old 09-04-2010
I think there are a lot of us here who could write that in C in a matter of a few minutes, but you'd not learn anything if any of us did. Thus, I'll offer a few pointers:
  • look at using argc and argv to get the file name from the command line
  • Use the stat() function to determine whether the file exists.
  • Use the unlink() funciton to remove the file if it exists

Use the man command to determine the calling parameters and how they work. Have fun -- C is a wonderful language.
 

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DD-LIST(1)						      General Commands Manual							DD-LIST(1)

NAME
dd-list - nicely list .deb packages and their maintainers SYNOPSIS
dd-list [-hiusV] [--help] [--stdin] [--sources Sources_file] [--dctrl] [--version] [--uploaders] [package ...] DESCRIPTION
dd-list produces nicely formatted lists of Debian (.deb) packages and their maintainers. Input is a list of source or binary package names on the command line (or the standard input if --stdin is given). Output is a list of the following format, where package names are source packages by default: J. Random Developer <jrandom@debian.org> j-random-package j-random-other Diana Hacker <diana@example.org> fun-package more-fun-package This is useful when you want, for example, to produce a list of packages that need to attention from their maintainers, e.g., to be rebuilt when a library version transition happens. OPTIONS
-h, --help Print brief help message. -i, --stdin Read package names from the standard input, instead of taking them from the command line. Package names are whitespace delimited. -d, --dctrl Read package list from standard input in the format of a Debian package control file. This includes the status file, or output of apt-cache. This is the fastest way to use dd-list, as it uses the maintainer information from the input instead of looking up the maintainer of each listed package. If no Source: line is given, the Package: name is used for output, which might be a binary package name. -s, --sources Sources_file Read package information from the specified Sources_files. This can be given multiple times. If no Sources_files are specified, any files matching /var/lib/apt/lists/*_source_Sources will be used. -u, --uploaders Also list developers who are named as uploaders of packages, not only the maintainers; this is the default behaviour, use --nou- ploaders to prevent it. Uploaders are indicated with "(U)" appended to the package name. -nou, --nouploaders Only list package Maintainers, do not list Uploaders. -b, --print-binary Use binary package names in the output instead of source package names (has no effect with --dctrl if the Package: line contains source package names). -V, --version Print the version. AUTHOR
Lars Wirzenius <liw@iki.fi> Joey Hess <joeyh@debian.org> Debian 2011-10-27 DD-LIST(1)
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