Full Discussion: Extracting .tar.gz files
Top Forums Shell Programming and Scripting Extracting .tar.gz files Post 302985131 by Don Cragun on Saturday 5th of November 2016 07:20:48 PM
Quote:
Originally Posted by RudiC
Wouldn't you need to account for the archives being gzipped; either by gunzipping them first or by adding the -z option to tar.
Some versions of tar (and cpio and pax) need to be given options to specify the type of archive to create when building a new archive, but automatically detect the archive type when extracting from or adding to an existing archive. Since we haven't been told what operating system is being used in this case, there isn't any way for us to check the man pages for that system to see if -z option is required when extracting files for the OP's system. The standards require pax to do this, but no longer require that cpio and tar even be present on conforming implementations. Although the standards never required that any of these utilities produce or process compressed archives, I don't remember seeing any version of pax that has options to produce a compressed archive that needed to be told that that archive was compressed when extracting files from it.
 
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SENDFILES(1)							     [nmh-1.5]							      SENDFILES(1)

NAME
sendfiles - send multiple files via a MIME message SYNOPSIS
sendfiles [delay] mailpath subject file1 [file2 ...] DESCRIPTION
The shell script sendfiles, is used to send a collection of files and directories via electronic mail. sendfiles mailpath "subject" files ... sendfiles will archive the files and directories you name with the tar command, and then mail the compressed archive to the "mailpath" with the given "subject". The archive will be automatically split up into as many messages as necessary in order to get past most mailers. Sometimes you want sendfiles to pause after posting a partial message. This is usually the case when you are running sendmail and expect to generate a lot of partial messages. If the first argument given to sendfiles starts with a dash, then it is interpreted as the number of seconds to pause in between postings, e.g., sendfiles -30 mailpath "subject" files ... will pause 30 seconds in between each posting. Extracting the Received Files When these messages are received, invoke mhstore once for the list of messages. The default is for mhstore to store the combined parts as a new message in the current folder, although this can be changed using storage formatting strings. You can then use mhlist to find out what's inside; possibly followed by mhstore again to write the archive to a file where you can subsequently uncompress and untar it. For instance: % mhlist 5-8 msg part type/subtype size description 5 message/partial 47K part 1 of 4 6 message/partial 47K part 2 of 4 7 message/partial 47K part 3 of 4 8 message/partial 18K part 4 of 4 % mhstore 5-8 reassembling partials 5,6,7,8 to folder inbox as message 9 % mhlist -verbose 9 msg part type/subtype size description 9 application/octet-stream 118K (extract with uncompress | tar xvpf -) type=tar conversions=compress % mhstore 9 % uncompress < 9.tar.Z | tar xvpf - Alternately, by using the -auto switch, mhstore will automatically do the extraction for you: % mhlist 5-8 msg part type/subtype size description 5 message/partial 47K part 1 of 4 6 message/partial 47K part 2 of 4 7 message/partial 47K part 3 of 4 8 message/partial 18K part 4 of 4 % mhstore 5-8 reassembling partials 5,6,7,8 to folder inbox as message 9 % mhlist -verbose 9 msg part type/subtype size description 9 application/octet-stream 118K (extract with uncompress | tar xvpf -) type=tar conversions=compress % mhstore -auto 9 -- tar listing appears here as files are extracted As the second tar listing is generated, the files are extracted. A prudent user will never put -auto in the .mh_profile file. The correct procedure is to first use mhlist to find out what will be extracted. Then mhstore can be invoked with -auto to perform the extraction. FILES
$HOME/.mh_profile The user profile PROFILE COMPONENTS
Path: To determine the user's nmh directory Current-Folder: To find the default current folder SEE ALSO
mhbuild(1), mhlist(1), mhshow(1), mhstore(1). Proposed Standard for Message Encapsulation (RFC-934) DEFAULTS
`-noverbose' CONTEXT
None MH.6.8 11 June 2012 SENDFILES(1)

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