It is quite useful to view the contents of a zip, tar.gz or tar.bz2 file without extracting the file from the terminal.
View contents of a zip file
unzip -l archive.zip
View contents of a tar.gz file
tar -ztvf archive.tar.gz
View the contents of a tar.bz2 file
tar -jtvf archive.tar.bz2
View archive contents and search for a specific file therein:
tar -tvf archive.tar.bz2 '*someSearchString'