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Top Forums UNIX for Dummies Questions & Answers How to download files matching pattern from FTP using CURL or WGET? Post 302853715 by Smiling Dragon on Sunday 15th of September 2013 11:58:40 PM
Old 09-16-2013
Weeeellll, with a bit of bodging you can sort of do this.
Tar allows you to operate on an incoming stream (it was originally designed for this) and stop when you've got all you want. You still need to seek through the file until you've found all the files you want:
Code:
wget -q -O - "<url of tarball>" | gunzip -c | tar -xf - "<filename you want to extract>"

This will seek through the tarball, streaming off the ftp server and pop the file you want off as it passes. You can specify multiple files on the one commandline but this will only work if you know the files (although you could try passing an escaped wildcard and see how you go - you'll have to manually abort the extract once you feel you have all the files you want though).
You can also pass the "--files-from <file containing the filnames you want>" flag to tar if you prefer.

Note that this won't save you loads of time, especially so if all the files you want are at the end of the archive, but it will help if they are at the start of the file and it's an interesting exercise in streams.
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TAR(1)							      General Commands Manual							    TAR(1)

NAME
tar - archiver SYNOPSIS
tar key [ file ... ] DESCRIPTION
Tar saves and restores file trees. It is most often used to transport a tree of files from one system to another. The key is a string that contains at most one function letter plus optional modifiers. Other arguments to the command are names of files or directories to be dumped or restored. A directory name implies all the contained files and subdirectories (recursively). The function is one of the following letters: c Create a new archive with the given files as contents. x Extract the named files from the archive. If a file is a directory, the directory is extracted recursively. Modes are restored if possible. If no file argument is given, extract the entire archive. If the archive contains multiple entries for a file, the lat- est one wins. t List all occurrences of each file in the archive, or of all files if there are no file arguments. r The named files are appended to the archive. The modifiers are: v (verbose) Print the name of each file treated preceded by the function letter. With t, give more details about the archive entries. f Use the next argument as the name of the archive instead of the default standard input (for keys x and t) or standard output (for keys c and r). u Use the next (numeric) argument as the user id for files in the output archive. This is only useful when moving files to a non-Plan 9 system. g Use the next (numeric) argument as the group id for files in the output archive. EXAMPLES
Tar can be used to copy hierarchies thus: {cd fromdir; tar c .} | {cd todir; tar x} SOURCE
/sys/src/cmd/tar.c SEE ALSO
ar(1), bundle(1), tapefs(1) BUGS
There is no way to ask for any but the last occurrence of a file. File path names are limited to 100 characters. The tar format allows specification of links and symbolic links, concepts foreign to Plan 9: they are ignored. TAR(1)
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