Verifying Installed Packages with debsums

There are times when you will question the behavior of a binary or package installed on the system. It may not perform correctly, or may not even start at all. Problems with corrupt packages from unstable network connections or power outages do happen. In addition, malicious users may attempt to replace powerful commands with their own versions to cause further harm. It becomes useful to check the files on the file system against the information stored in the package. The debsums program is a...

Creating Backup Images with mkisofs

Most data CDs and DVDs can be accessed on both Windows and Linux systems because they are created using the IS09660 standard for formatting the information on those discs. Because most modern operating systems need to save more information about files and directories than the basic IS09660 standard includes, extensions to that standard were added to contain that information. Using the mkisofs command, you can back up the file and directory structure from any point in your Linux file system and...

Installing Packages with APT

You can now install, using sudo, any available software authored by Google for Ubuntu, using APT or another package tool. This shows Picasa being installed using APT Reading package lists Done Building dependency tree Reading state information Done The following NEW packages will be installed picasa 0 upgraded, 1 newly installed, 0 to remove and 115 not upgraded. Need to get 21.7MB of archives. After unpacking 82.3MB of additional disk space will be used. Get 1 http dl.google.com stable...

C

Cal command, calendar, displaying, 198 calendar, displaying, 198 Canonical Group, 2 contact information, 4 card command, help message, format output, 12 case command, case test, 67 case sensitivity find command, 83 locate command, 82 search, ignore case, 100 cat command ASCII text, extracting, 102 one file, verifying, 87 proc information, viewing, 193-194, 301-305 text, replacing, 102 text files content, displaying, 104 text file format, converting, 106-107 text files, listing, 97 CD(s)...