Module Linux essentials - Module 6 guide archive files on the command line. This module include content: Archiving vs. compression, uses of archiving and compression, lossless vs lossy compression, gzip vs bzip2, using gzip/gunzip/bzip2/bunzip2,...
Module Archiving and Compression This slide deck is for LPI Academy instructors to use for lectures for LPI Academy courses ©Copyright Network Development Group 2013 Exam Objective 3.1 Archiving Files on the Objective Summary Command Line – Using archiving and compression with files and directories This slide deck is for LPI Academy instructors to use for lectures for LPI Academy courses ©Copyright Network Development Group 2013 Archiving and Compression This slide deck is for LPI Academy instructors to use for lectures for LPI Academy courses ©Copyright Network Development Group 2013 Archiving vs Compression • Archiving collapses multiple files into one – • A few files or multiple directories Compression makes a file smaller – Remove redundant information, replace with a smaller code – Can be applied to individual files, groups of files or entire directory trees This slide deck is for LPI Academy instructors to use for lectures for LPI Academy courses ©Copyright Network Development Group 2013 Uses of Archiving and Compression • Managing log files • Sharing groups of files • – Project documents – Source code Compressing for more efficient transfer – • Less data to send over the Internet or to tape Keep like files together grouped by time – Backups This slide deck is for LPI Academy instructors to use for lectures for LPI Academy courses ©Copyright Network Development Group 2013 Lossless vs Lossy Compression Lossless: • • • • Lossy: Decompressed file is the same as the original Doesn’t compress as well as lossy For data you want to preserve Logs, documents, • • Decompressed file might have lost information from the original Drops “unimportant” information from the file to make it compress better This slide deck is for LPI Academy instructors to use for lectures for LPI Academy courses ©Copyright Network Development Group 2013 gzip vs bzip2 • • • gzip and gunzip Uses Lempel-Ziv coding Lossless compression, good efficiency • • • Bzip2 and bunzip2 Burrows-Wheeler block sorting Lossless compression, slightly more efficient than gzip, but requires more CPU This slide deck is for LPI Academy instructors to use for lectures for LPI Academy courses ©Copyright Network Development Group 2013 Using gzip/gunzip/bzip2/bunzip2 gzip foo # removes foo; creates foo.gz gunzip foo.gz # removes foo.gz; creates foo gunzip –l foo.gz # shows statistics bzip2 foo # removes foo; creates foo.bz2 bunzip2 foo.bz2 bunzip2 –l foo.bz2 # DOESN’T EXIST! This slide deck is for LPI Academy instructors to use for lectures for LPI Academy courses ©Copyright Network Development Group 2013 Tape Archive - TAR tar –cf foo.tar * # create tar –tf foo.tar # show info tar –xf foo.tar # extract tar –czf foo.tgz * # gzip tar –xjf foo.tbz # bunzip2 tar –xf foo.tar home/joe This slide deck is for LPI Academy instructors to use for lectures for LPI Academy courses # only extract home/joe ©Copyright Network Development Group 2013 ZIP zip output.zip file1 file2 file3 zip foo.zip file.doc # One file zip –r foo.zip Documents # recurse unzip –l foo.zip # show contents unzip foo.zip # extract all unzip foo.zip file1 # just file unzip foo.zip Documents/projectA/* # everything under Documents/projectA This slide deck is for LPI Academy instructors to use for lectures for LPI Academy courses ©Copyright Network Development Group 2013 ...Exam Objective 3.1 Archiving Files on the Objective Summary Command Line – Using archiving and compression with files and directories This slide deck is for LPI Academy... 2013 Archiving and Compression This slide deck is for LPI Academy instructors to use for lectures for LPI Academy courses ©Copyright Network Development Group 2013 Archiving vs Compression • Archiving. .. 2013 gzip vs bzip2 • • • gzip and gunzip Uses Lempel-Ziv coding Lossless compression, good efficiency • • • Bzip2 and bunzip2 Burrows-Wheeler block sorting Lossless compression, slightly more efficient