tar: compress text stdin and stdout [duplicate]
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Is it possible to make a .tar.gz file directly from stdin? Or, I need to tar together already gzipped files
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Using tar, is it possible to compress stdin text and have the compressed data appear in stdout? Example:
$ echo "test" | tar c -
<compressed blob here>
I'm using macOS Mojave.
linux terminal osx tar compression
asked Nov 22 at 18:09
user322355
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marked as duplicate by Filipe Brandenburger, Kusalananda linux
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Nov 22 at 18:23
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This question already has an answer here:
Is it possible to make a .tar.gz file directly from stdin? Or, I need to tar together already gzipped files
4 answers
Using tar, is it possible to compress stdin text and have the compressed data appear in stdout? Example:
$ echo "test" | tar c -
<compressed blob here>
I'm using macOS Mojave.
linux terminal osx tar compression
asked Nov 22 at 18:09
user322355
82
marked as duplicate by Filipe Brandenburger, Kusalananda linux
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Nov 22 at 18:23
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This question already has an answer here:
Is it possible to make a .tar.gz file directly from stdin? Or, I need to tar together already gzipped files
4 answers
Using tar, is it possible to compress stdin text and have the compressed data appear in stdout? Example:
$ echo "test" | tar c -
<compressed blob here>
I'm using macOS Mojave.
linux terminal osx tar compression
asked Nov 22 at 18:09
user322355
82
This question already has an answer here:
Is it possible to make a .tar.gz file directly from stdin? Or, I need to tar together already gzipped files
4 answers
Using tar, is it possible to compress stdin text and have the compressed data appear in stdout? Example:
$ echo "test" | tar c -
<compressed blob here>
I'm using macOS Mojave.
This question already has an answer here:
Is it possible to make a .tar.gz file directly from stdin? Or, I need to tar together already gzipped files
4 answers
linux terminal osx tar compression
linux terminal osx tar compression
asked Nov 22 at 18:09
user322355
82
asked Nov 22 at 18:09
user322355
82
asked Nov 22 at 18:09
user322355
82
asked Nov 22 at 18:09
user322355
82
asked Nov 22 at 18:09
user322355
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marked as duplicate by Filipe Brandenburger, Kusalananda linux
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Nov 22 at 18:23
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1 Answer
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In short, no it's not possible to do that without storing the whole contents of stdin into a file or temporary file (e.g. in memory.)
This is a limitation of the tar file format itself, since before storing the file contents, tar stores a descriptor for the file, including file name, etc. and also the file size. So tar needs to know what is the size of the file before storing it. When reading from stdin, tar can't know the size of the contents, unless it reads all of them, in which case it'll need to store them somewhere, in order to store those contents in the tarball itself.
See also "Is it possible to make a .tar.gz file directly from stdin? Or, I need to tar together already gzipped files." One of the answers lists a way to store the contents of the file first, then seek back and update the file descriptor to write the actual size of the contents. But that requires the ability to seek on the output file, which is typically not the case if you're writing to stdout...
In short, you need to write your input to a temporary file, in order to add it to a tarball.
answered Nov 22 at 18:30
Filipe Brandenburger
6,5901731
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
1
down vote
accepted
In short, no it's not possible to do that without storing the whole contents of stdin into a file or temporary file (e.g. in memory.)
This is a limitation of the tar file format itself, since before storing the file contents, tar stores a descriptor for the file, including file name, etc. and also the file size. So tar needs to know what is the size of the file before storing it. When reading from stdin, tar can't know the size of the contents, unless it reads all of them, in which case it'll need to store them somewhere, in order to store those contents in the tarball itself.
See also "Is it possible to make a .tar.gz file directly from stdin? Or, I need to tar together already gzipped files." One of the answers lists a way to store the contents of the file first, then seek back and update the file descriptor to write the actual size of the contents. But that requires the ability to seek on the output file, which is typically not the case if you're writing to stdout...
In short, you need to write your input to a temporary file, in order to add it to a tarball.
answered Nov 22 at 18:30
Filipe Brandenburger
6,5901731
add a comment |
up vote
1
down vote
accepted
In short, no it's not possible to do that without storing the whole contents of stdin into a file or temporary file (e.g. in memory.)
This is a limitation of the tar file format itself, since before storing the file contents, tar stores a descriptor for the file, including file name, etc. and also the file size. So tar needs to know what is the size of the file before storing it. When reading from stdin, tar can't know the size of the contents, unless it reads all of them, in which case it'll need to store them somewhere, in order to store those contents in the tarball itself.
See also "Is it possible to make a .tar.gz file directly from stdin? Or, I need to tar together already gzipped files." One of the answers lists a way to store the contents of the file first, then seek back and update the file descriptor to write the actual size of the contents. But that requires the ability to seek on the output file, which is typically not the case if you're writing to stdout...
In short, you need to write your input to a temporary file, in order to add it to a tarball.
answered Nov 22 at 18:30
Filipe Brandenburger
6,5901731
add a comment |
up vote
1
down vote
accepted
up vote
1
down vote
accepted
In short, no it's not possible to do that without storing the whole contents of stdin into a file or temporary file (e.g. in memory.)
This is a limitation of the tar file format itself, since before storing the file contents, tar stores a descriptor for the file, including file name, etc. and also the file size. So tar needs to know what is the size of the file before storing it. When reading from stdin, tar can't know the size of the contents, unless it reads all of them, in which case it'll need to store them somewhere, in order to store those contents in the tarball itself.
See also "Is it possible to make a .tar.gz file directly from stdin? Or, I need to tar together already gzipped files." One of the answers lists a way to store the contents of the file first, then seek back and update the file descriptor to write the actual size of the contents. But that requires the ability to seek on the output file, which is typically not the case if you're writing to stdout...
In short, you need to write your input to a temporary file, in order to add it to a tarball.
answered Nov 22 at 18:30
Filipe Brandenburger
6,5901731
In short, no it's not possible to do that without storing the whole contents of stdin into a file or temporary file (e.g. in memory.)
This is a limitation of the tar file format itself, since before storing the file contents, tar stores a descriptor for the file, including file name, etc. and also the file size. So tar needs to know what is the size of the file before storing it. When reading from stdin, tar can't know the size of the contents, unless it reads all of them, in which case it'll need to store them somewhere, in order to store those contents in the tarball itself.
See also "Is it possible to make a .tar.gz file directly from stdin? Or, I need to tar together already gzipped files." One of the answers lists a way to store the contents of the file first, then seek back and update the file descriptor to write the actual size of the contents. But that requires the ability to seek on the output file, which is typically not the case if you're writing to stdout...
In short, you need to write your input to a temporary file, in order to add it to a tarball.
answered Nov 22 at 18:30
Filipe Brandenburger
6,5901731
answered Nov 22 at 18:30
Filipe Brandenburger
6,5901731
answered Nov 22 at 18:30
Filipe Brandenburger
6,5901731
answered Nov 22 at 18:30
Filipe Brandenburger
6,5901731
6,5901731
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