Useful programs

Debian only

• aptitude, an apt-get text GUI I now prefer using this instead of apt-get.
• apt-cache ("search" for packages)
• apt-file ("search" for a file in all packages)
• apt-get ("install" packages)
• make-kpkg - build Debian kernel packages from Linux kernel sources

Cool commands

• anjuta (a cool editor, also a Gnome IDE but I don't approve of IDE usage :)
• cvs - Concurrent Versions System
• ddd - The Data Display Debugger (GUI for gdb)
• doxygen - Generate nice API documentations from your source files
• fuser - identify processes using files or sockets (fix problems like umount: /cdrom: device is busy)
• gcc - GNU project C and C++ compiler
• gdb - The GNU Debugger (debug you ".exe" files)
• latex - structured text formatting and typesetting
• lsof - list open files
• mmv - move/copy/append/link multiple files by wildcard patterns
• perl - Practical Extraction and Report Language (cool scripting language)
• strace - trace system calls and signals
• valgrind - a memory debugger for x86-linux (detect memory leeks, deadlocks and more)
• xargs - build and execute command lines from standard input
• The operators < , > and ¦ (use pipes when needing godlike powers)

Basic commands

• df - report filesystem disk space usage (se option -h)
• du - estimate file space usage (se option -h and --max-depth)
• find - search for files in a directory hierarchy (find files by name, size, modification date and more)
• grep - print lines matching a pattern (find text in you code files)
• info - read Info documents (like man but with links)
• kill - send a signal to a process (need some program terminated?)
• killall - kill processes by name (the program that makes the mob envious)
• less - opposite of more (read files with scrolling)
• ls - list directory contents
• man - an interface to the on-line reference manuals
• ps - report a snapshot of the current processes.
• sort - sort lines of text files
• top - display Linux tasks
• wc - print the number of newlines, words, and bytes in files