tar: Using `--one-top-level` when input is piped in
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I'm trying to download a tar (works) and immediately unpack it to a subdirectory (ideally named the same as the archive). I thought following code should work but it attempts to write the write unpacked files to STDOUT and fails.
wget -O - https://ufal.mff.cuni.cz/~zabokrtsky/courses/npfl104/data/classification/artificial_objects.tgz | tar -xvz --one-top-level
Results in (very cryptic failure):
...
Saving to: ‘STDOUT’
...
Cannot write to ‘-’ (Success).
Not specifying --one-top-level fixes the issue but then the files inside just get extracted to current folder, as expected.
Doing it in two separate commands: downloading it first and then unpacking with intermediate file works, again as expected.
wget https://ufal.mff.cuni.cz/~zabokrtsky/courses/npfl104/data/classification/artificial_objects.tgz
tar -xvz --one-top-level -f artificial_objects.tgz
I know that I could create a subfolder and change tar's output directory using -C but I'd rather understand why my approach doesn't work.
TAR v2016
bash tar
asked Mar 5 at 17:27
PetrrollPetrroll
1033
add a comment |
I'm trying to download a tar (works) and immediately unpack it to a subdirectory (ideally named the same as the archive). I thought following code should work but it attempts to write the write unpacked files to STDOUT and fails.
wget -O - https://ufal.mff.cuni.cz/~zabokrtsky/courses/npfl104/data/classification/artificial_objects.tgz | tar -xvz --one-top-level
Results in (very cryptic failure):
...
Saving to: ‘STDOUT’
...
Cannot write to ‘-’ (Success).
Not specifying --one-top-level fixes the issue but then the files inside just get extracted to current folder, as expected.
Doing it in two separate commands: downloading it first and then unpacking with intermediate file works, again as expected.
wget https://ufal.mff.cuni.cz/~zabokrtsky/courses/npfl104/data/classification/artificial_objects.tgz
tar -xvz --one-top-level -f artificial_objects.tgz
I know that I could create a subfolder and change tar's output directory using -C but I'd rather understand why my approach doesn't work.
TAR v2016
bash tar
asked Mar 5 at 17:27
PetrrollPetrroll
1033
add a comment |
I'm trying to download a tar (works) and immediately unpack it to a subdirectory (ideally named the same as the archive). I thought following code should work but it attempts to write the write unpacked files to STDOUT and fails.
wget -O - https://ufal.mff.cuni.cz/~zabokrtsky/courses/npfl104/data/classification/artificial_objects.tgz | tar -xvz --one-top-level
Results in (very cryptic failure):
...
Saving to: ‘STDOUT’
...
Cannot write to ‘-’ (Success).
Not specifying --one-top-level fixes the issue but then the files inside just get extracted to current folder, as expected.
Doing it in two separate commands: downloading it first and then unpacking with intermediate file works, again as expected.
wget https://ufal.mff.cuni.cz/~zabokrtsky/courses/npfl104/data/classification/artificial_objects.tgz
tar -xvz --one-top-level -f artificial_objects.tgz
I know that I could create a subfolder and change tar's output directory using -C but I'd rather understand why my approach doesn't work.
TAR v2016
bash tar
asked Mar 5 at 17:27
PetrrollPetrroll
1033
I'm trying to download a tar (works) and immediately unpack it to a subdirectory (ideally named the same as the archive). I thought following code should work but it attempts to write the write unpacked files to STDOUT and fails.
wget -O - https://ufal.mff.cuni.cz/~zabokrtsky/courses/npfl104/data/classification/artificial_objects.tgz | tar -xvz --one-top-level
Results in (very cryptic failure):
...
Saving to: ‘STDOUT’
...
Cannot write to ‘-’ (Success).
Not specifying --one-top-level fixes the issue but then the files inside just get extracted to current folder, as expected.
Doing it in two separate commands: downloading it first and then unpacking with intermediate file works, again as expected.
wget https://ufal.mff.cuni.cz/~zabokrtsky/courses/npfl104/data/classification/artificial_objects.tgz
tar -xvz --one-top-level -f artificial_objects.tgz
I know that I could create a subfolder and change tar's output directory using -C but I'd rather understand why my approach doesn't work.
TAR v2016
bash tar
bash tar
asked Mar 5 at 17:27
PetrrollPetrroll
1033
asked Mar 5 at 17:27
PetrrollPetrroll
1033
edited Mar 5 at 21:13
Petrroll
asked Mar 5 at 17:27
PetrrollPetrroll
1033
asked Mar 5 at 17:27
PetrrollPetrroll
1033
asked Mar 5 at 17:27
PetrrollPetrroll
1033
1033
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
ideally named the same as the archive
It's true man 1 tar says
--one-top-level[=DIR]
Extract all files intoDIR, or, if used without argument, into a subdirectory named by the base name of the archive (minus standard compression suffixes recognizable by--auto-compress).
The problem is tar in your pipe cannot know the name of the archive; only wget knows it. The message Cannot write to ‘-’ (Success) is cryptic to me, as if the tool got confused. In my tests the exit status is 2, this contradicts the alleged "success". Maybe tar should be improved in handling this case.
Anyway, tar doesn't know the name of the archive. It will work if you provide DIR:
wget -O - https://ufal.mff.cuni.cz/~zabokrtsky/courses/npfl104/data/classification/artificial_objects.tgz
| tar -xvz --one-top-level=artificial_objects
It may or may not be artificial_objects, it's totally up to you. The tool will create the directory, if needed.
Based on
$ tar --version
tar (GNU tar) 1.29
…
answered Mar 5 at 18:13
Kamil MaciorowskiKamil Maciorowski
29k156287
add a comment |
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1 Answer
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active
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1 Answer
1
active
oldest
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active
oldest
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active
oldest
votes
ideally named the same as the archive
It's true man 1 tar says
--one-top-level[=DIR]
Extract all files intoDIR, or, if used without argument, into a subdirectory named by the base name of the archive (minus standard compression suffixes recognizable by--auto-compress).
The problem is tar in your pipe cannot know the name of the archive; only wget knows it. The message Cannot write to ‘-’ (Success) is cryptic to me, as if the tool got confused. In my tests the exit status is 2, this contradicts the alleged "success". Maybe tar should be improved in handling this case.
Anyway, tar doesn't know the name of the archive. It will work if you provide DIR:
wget -O - https://ufal.mff.cuni.cz/~zabokrtsky/courses/npfl104/data/classification/artificial_objects.tgz
| tar -xvz --one-top-level=artificial_objects
It may or may not be artificial_objects, it's totally up to you. The tool will create the directory, if needed.
Based on
$ tar --version
tar (GNU tar) 1.29
…
answered Mar 5 at 18:13
Kamil MaciorowskiKamil Maciorowski
29k156287
add a comment |
ideally named the same as the archive
It's true man 1 tar says
--one-top-level[=DIR]
Extract all files intoDIR, or, if used without argument, into a subdirectory named by the base name of the archive (minus standard compression suffixes recognizable by--auto-compress).
The problem is tar in your pipe cannot know the name of the archive; only wget knows it. The message Cannot write to ‘-’ (Success) is cryptic to me, as if the tool got confused. In my tests the exit status is 2, this contradicts the alleged "success". Maybe tar should be improved in handling this case.
Anyway, tar doesn't know the name of the archive. It will work if you provide DIR:
wget -O - https://ufal.mff.cuni.cz/~zabokrtsky/courses/npfl104/data/classification/artificial_objects.tgz
| tar -xvz --one-top-level=artificial_objects
It may or may not be artificial_objects, it's totally up to you. The tool will create the directory, if needed.
Based on
$ tar --version
tar (GNU tar) 1.29
…
answered Mar 5 at 18:13
Kamil MaciorowskiKamil Maciorowski
29k156287
add a comment |
ideally named the same as the archive
It's true man 1 tar says
--one-top-level[=DIR]
Extract all files intoDIR, or, if used without argument, into a subdirectory named by the base name of the archive (minus standard compression suffixes recognizable by--auto-compress).
The problem is tar in your pipe cannot know the name of the archive; only wget knows it. The message Cannot write to ‘-’ (Success) is cryptic to me, as if the tool got confused. In my tests the exit status is 2, this contradicts the alleged "success". Maybe tar should be improved in handling this case.
Anyway, tar doesn't know the name of the archive. It will work if you provide DIR:
wget -O - https://ufal.mff.cuni.cz/~zabokrtsky/courses/npfl104/data/classification/artificial_objects.tgz
| tar -xvz --one-top-level=artificial_objects
It may or may not be artificial_objects, it's totally up to you. The tool will create the directory, if needed.
Based on
$ tar --version
tar (GNU tar) 1.29
…
answered Mar 5 at 18:13
Kamil MaciorowskiKamil Maciorowski
29k156287
ideally named the same as the archive
It's true man 1 tar says
--one-top-level[=DIR]
Extract all files intoDIR, or, if used without argument, into a subdirectory named by the base name of the archive (minus standard compression suffixes recognizable by--auto-compress).
The problem is tar in your pipe cannot know the name of the archive; only wget knows it. The message Cannot write to ‘-’ (Success) is cryptic to me, as if the tool got confused. In my tests the exit status is 2, this contradicts the alleged "success". Maybe tar should be improved in handling this case.
Anyway, tar doesn't know the name of the archive. It will work if you provide DIR:
wget -O - https://ufal.mff.cuni.cz/~zabokrtsky/courses/npfl104/data/classification/artificial_objects.tgz
| tar -xvz --one-top-level=artificial_objects
It may or may not be artificial_objects, it's totally up to you. The tool will create the directory, if needed.
Based on
$ tar --version
tar (GNU tar) 1.29
…
answered Mar 5 at 18:13
Kamil MaciorowskiKamil Maciorowski
29k156287
edited Mar 5 at 18:24
answered Mar 5 at 18:13
Kamil MaciorowskiKamil Maciorowski
29k156287
answered Mar 5 at 18:13
Kamil MaciorowskiKamil Maciorowski
29k156287
answered Mar 5 at 18:13
Kamil MaciorowskiKamil Maciorowski
29k156287
29k156287
add a comment |
add a comment |
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