Editing Solaris 10 Associate (section)

== Archiving files ==

tar or jar commands are two commonly used archiving commands

* use tar command to create & extract files from a file archive
* tar command archives files to & extracts files from a single file called a tar file
* default device for tar file is magnetic tap device
* Syntax: <code>tar functions archivefilename filenames</code>

Functions for tar command:
<table style="text-align: left; width: 50%;" border="1"
 cellpadding="2" cellspacing="0">
    <tr>
      <td>function</td>
      <td>definition</td>
    </tr>
    <tr>
      <td>c</td>
      <td>creates a new tar file</td>
    </tr>
<tr>
      <td>t</td>
      <td>lists the table of contents of the tar file</td>
    </tr>
<tr>
      <td>x</td>
      <td>extract files from the tar file</td>
    </tr>
<tr>
      <td>v</td>
      <td>executes in verbose mode, writes to the standard output</td>
</tr>
<tr>
      <td>f</td>
      <td>
* specifies archive file or tape device
* default tape device is /dev/rmt/0
* if name of archive file is "-" the tar command reads from standard input when reading from a tar archive or writes to standard output if create tar archive
      </td>
</tr>
<tr>
      <td>h</td>
      <td>follows symbolic links as standard files or directories</td>
</tr>
</table>

Example of list contents in tar:

<code>tar -tf /stage/installdir.tar</code>


=== archive on USB drive ===

Volume Management daemon, vold, provides automatic detection of removable media

<add info volcheck command>

if not detected but not mounted run <code>$ volrmmount -i rmdisk0</code>

perform volrmmount command to create the /rmdisk directory and its contents when a flash drive is present

access files of flash drive by changing to /rmdisk/rmdisk0 directory

eject flash drive by using <code>eject</code> command example syntax: <code>eject rmdisk0</code>

cannot be in working directory of the removable media while attempting to eject

=== using <code>jar</code> command ===

* use <code>jar</code> command to compress & combine multiple files into a single archive
* Syntax: <code>jar options destination filenames</code>

Options for tar command:
<table style="text-align: left; width: 50%;" border="1"
 cellpadding="2" cellspacing="0">
    <tr>
      <td>function</td>
      <td>definition</td>
    </tr>
    <tr>
      <td>c</td>
      <td>creates a new <code>jar</code> file</td>
    </tr>
<tr>
      <td>t</td>
      <td>lists the table of contents of the <code>jar</code> file</td>
    </tr>
<tr>
      <td>x</td>
      <td>extract files from the <code>jar</code> file</td>
    </tr>
<tr>
      <td>f</td>
      <td>specifies <code>jar</code> file to process, the <code>jar</code> command sends data to screen if <code>f</code> option is not used
      </td>
</tr>
<tr>
      <td>v</td>
      <td>executes in verbose mode</td>
</tr>
</table>

<insert examples using <code>jar</code> command>

=== compressing files ===

==== using <code>compress</code> command ====

Syntax: <code>compress [ -v ] filename</code>

compress command replaces the original file with a new file that has a <code>.Z extension</code>

<insert examples using <code>compress</code> command>

<code>$ compress -v file1.tar</code>

==== using <code>7za</code> command ====

Syntax: <code>7za command archivefile filenames</code> or <code>7za command archivefile directory</code>

Add file to archive

<code>7za a file.7z fileToArchive<code>

Extract file from archive

<code>7za e file.7z</code>

Add directory to archive

<code>7za a file.7z directoryToArchive</code>

Extract directory from archive

<code>7za e file.7z</code>

==== <code>zcat</code> command ====

use <code>zcat</code> command to view files that were compressed by the <code>compress</code> command

<code>zcat</code> command allows user to view contents of file & doesn't modify contents of a compressed file

Syntax: <code>zcat filename</code>

<insert examples of <code>zcat</code> command>

Extract contents of compressed tar without uncompressing the tar file first:

<code>$ zcat files.tar.Z | tar xvf -</code>

=== uncompressing files ===

use <code>uncompress</code> command to uncompress

Syntax: <code>uncompress options filename</code>

<insert examples of uncompress command>

=== <code>gzip</code> command ===

use <code>gzip</code> to compress files

Syntax: <code>$ gzip [ -v ] filenames</code>

use <code>gzip</code> to uncompress files that have been compressed with gzip

Syntax: <code>gzip -d filename</code>

Example: <code>gzip -d game_installation.tar.gz</code>

use <code>gzip -l filename.gz</code> to list contents of gzip file

Example:

<pre>bash-3.2# gzip -l installdir.tar.gz
         compressed        uncompressed  ratio uncompressed_name
          262314451           798312448  67.1% installdir.tar</pre>

=== use <code>gzcat</code> command ===

use <code>gzcat filename</code> command to !!view!! files that were compressed with <code>compress</code> or <code>gzip</code> commands

original file is unchanged

Syntax: <code>gzcat filename</code>

<insert examples of using <code>gzcat</code> command>

=== use <code>zip & unzip</code> command ===

* use <code>zip</code> command to compress multiple files into a single archive file
* syntax: <code>zip target_filename source_filenames</code>
* by default zip will add .zip extension
* use <code>zip</code> command to uncompress a zipped file
* syntax: <code>zip filename</code>
* use <code>unzip</code> command with <code>-l</code> option to list the files in a zip archive
* syntax: <code>unzip -l filename</code>

<insert examples of using zip and unzip commands>