I am trying to write qpdf output to stdout.
qpdf --empty --pages 1.pdf 1 2.pdf 2 -- /dev/stdout
But it says open /dev/stdout: Permission denied.
Why qpdf can not write the output to stdout? Does it require random access in the output file to successfully write the output? Thanks.
Related
Sometimes I get errors when I download files from a cloud with python-swiftclient, like this one:
Error downloading object 'uploads/1/image.png': Object GET failed: https://orbit.brightbox.com/v1/acc-12345/uploads/1/image.png 500 Internal Error b'An error occurred'
To search for the all errors and re-download failed files I would want to save output of the swift command to a file
I tried to do the following ways:
swift-cli -A https://orbit.brightbox.com/v1/acc-12345 \
-U user -K secret download uploads 2>&1 | tee uploads.log
# and
swift-cli -A https://orbit.brightbox.com/v1/acc-12345 \
-U user -K secret download uploads > uploads.log
But this didn't work. man swift describes -o option
For a single object download, you may use the -o [--output]
option to redirect the output to a specific file or if "-" then just redirect to stdout or with --no-download actually not to write anything to disk.
but when I try to download a directory with -o option if fails with
-o option only allowed for single file downloads
How can I save log to a file when I download a directory with swift CLI?
Actually redirecting output to a file works with swift-client:
swift-cli -A https://orbit.brightbox.com/v1/acc-12345 \
-U user -K secret download uploads > uploads.log
I was confused because after I started the command above, in another terminal window I did
tail -f uploads.log
But it didn't give me any output (like I was seeing when I was running the download command without redirection).
Seems like that swift-client writes to a file in batches and I needed to wait about a minute until tail -f dumps into the console a hundred of lines like this
uploads/documents/1/image.png [auth 0.000s, headers 0.390s, total 14.361s, 0.034 MB/s]
I'm trying to build some PDFs in a Makefile using Sphinx. The resulting PDF has broken references, so I want to fix those using pdftk.
Goal
So what I want to do for all PDFs I build is this:
# Creates the PDF files.
$(SPHINXBUILD) -b pdf $(ALLSPHINXOPTS) source/pdf/ $(BUILDDIR)/pdf_broken
# Go through all PDFs and fix them.
pdftk $(BUILDDIR)/pdf_broken/thepdf.pdf output $(BUILDDIR)/pdf/thepdf.pdf
Attempt with Make
So to do this with Make I have written this Makefile:
# Build PDF (results in broken references)
$(BUILDDIR)/pdf_broken/%.pdf:
$(SPHINXBUILD) -b pdf $(ALLSPHINXOPTS) source/pdf/ $(BUILDDIR)/pdf_broken
# This fixes the broken pdfs and produces the final result.
$(BUILDDIR)/pdf/%.pdf: $(BUILDDIR)/pdf_broken/%.pdf
mkdir -p $(BUILDDIR)/pdf/
pdftk $^ output $#
pdf: $(BUILDDIR)/pdf/%.pdf
Expected result
I'm using Pattern matching as I understand it from reading the manual:
http://www.tack.ch/gnu/make-3.82/make_91.html
Where $< as I understand it should be the prerequisite expanded so from my above example:
$(BUILDDIR)/pdf_broken/thepdf.pdf
and then $# should be the target:
$(BUILDDIR)/pdf/thepdf.pdf
So my recipe pdftk $^ output $# should run the command:
pdftk $(BUILDDIR)/pdf_broken/thepdf.pdf output $(BUILDDIR)/pdf/thepdf.pdf
Actual result
But this is not what is happening. Instead, this is run:
pdftk build/pdf_broken/%.pdf output build/pdf/%.pdf
Which obviously gives me an error:
Error: Unable to find file.
Error: Failed to open PDF file:
build/pdf_broken/%.pdf
Question
So my question is, what have I missundestood with how the pattern matching works, and how is the correct way to solve this using Make?
You should likely lookup pattern rules. In any case, it looks like you have a single command to generate all the files in the broken directory. This should have its own rule, and should likely output a dummy file to indicate it is complete. Your rule to fix the pdf files should be dependent on this dummy target being created.
It should be something like:
// get a list of expected output files:
PDF_SOURCES:=$(wildcard source/pdf/*)
PDF_OUTS:=$(patsubst $(PDF_SOURCES),source/pdf/%.pdf,$(BUILDDIR)/pdf/%.pdf);
// just for debugging:
$(info PDF_SOURCES = $(PDF_SOURCES))
$(info PDF_OUTS = $(PDF_OUTS))
// default rule
all: $(PDF_OUTS)
#echo done
// rule to build BUILDIR:
$(BUILDDIR)/pdf:
mkdir -p $#
// rule to build all broken files in one go:
// (note: generates a file .dosphynx, which is used to keep track
// of when the rule was run last. This rule will be run if the
// timestamp of any of the sources are newer.
.do_sphynx: $(PDF_SOURCES) | $(BUILDDIR)/pdf
$(SPHINXBUILD) -b pdf $(ALLSPHINXOPTS) source/pdf/ $(BUILDDIR)/pdf_broken
touch $#
// create a dependency of all output files on do_sphynx
$(PDF_OUTS): .do_sphynx
// patern rule to fix pdf files
$(BUILDDIR)/pdf/%.pdf : $(BUILDDIR)/pdf_broken/%.pdf
pdftk $< output $#
I've not tested this, so its possible it may have a syntax error in it..
---------------------- EDIT -------------
Ok, since $(PDF_OUTS) cannot be determined at makefile read time, perhaps you should do:
// get a list of expected output files:
PDF_SOURCES:=$(wildcard source/pdf/*)
all: .do_fix
#echo done
$(BUILDDIR)/pdf:
mkdir -p $#
.do_sphynx: $(PDF_SOURCES) | $(BUILDDIR)/pdf
$(SPHINXBUILD) -b pdf $(ALLSPHINXOPTS) source/pdf/ $(BUILDDIR)/pdf_broken
touch $#
.do_fix: .do_sphynx
#for src in $$(ls source/pdf/*.pdf); do \
trg=$${src/#"source/pdf"/"$(BUILD_DIR)/pdf"}; \
[[ $$src -nt $$trg ]] && \
echo "$$src ==> $$trg" && pdftk $$src output $$trg; \
done
touch $#
One note -- the -nt comparator in the if will return true if $trg does not exist, so it will cover the case where the file is missing, or the target is older than the source. Again not tested, but it should work.
Is there a command line option for asking inkscape to extract svg from pdf page 3 (for example)?
The command I use now is
$ inkscape -f test.pdf -l test.svg
but I would like also the option to export a specific page from this pdf.
What about extracting the page you need with pdftk (or in fact, any other suitable tool) first:
mypage=$(mktemp -u XXXXXX.pdf)
pdftk test.pdf cat 3 output "$mypage"
inkscape -l test.svg "$mypage"
rm "$mypage"
(It would be nice to be able to pipe the output from pdftk directly to inkscape. Unfortunately, when provided from stdin, data are expected by inkscape to be svg. A named pipe doesn't help either, because inkscape seems to attempt to traverse pdf files more than once.)
I have an sql file being called from shell script, and I want to capture the output of the execution into a log file. I am trying to capture by appending redirecting to log file like this >> log.txt but it is not working.
What do I need to do to fix it?
sqlplus -s ${USER}/${PWD}#${DATABASE} << EOF
#${LOADDIR}/VV_validation.sql
EOF'
Try this:
sqlplus -s ${USER}/${PWD}#${DATABASE}
spool your_file_name.log
##${LOADDIR}/VV_validation.sql
spool off
I am trying to convert a text file into a sequence file that I can run mahout kmeans on. When I run the seqdirectory utility, I do not get any errors and it says that the program is completed. However, when I look in the output directory, it is empty. I've looked around and can't find any solutions to this. Thoughts?
Here is what I run in the terminal:
hduser#ubuntu:~$ $MAHOUT_HOME/bin/mahout seqdirectory --input Downloads/google/ --output Downloads/sparsefiles/ -c UTF-8
This is the output I get:
12/07/06 06:24:19 INFO driver.MahoutDriver: Program took 1091 ms (Minutes: 0.018183333333333333)
I think it may be producing the output on hdfs. Try checking:
hadoop dfs -ls Downloads/sparsefiles/
Also, to ensure it produces in your local filesystem you can modify the command like:
$MAHOUT_HOME/bin/mahout seqdirectory --input file://<home path>/Downloads/google/ --output file://<home path>/Downloads/sparsefiles/ -c UTF-8