How to read unix environment variables
Abort (timeout) after N seconds?
In Linux with tsch, eg for 10 seconds:
limit cputime 10
UNIX: Remove a file with a name starting with - character.
Eg filename is
-v
rm ./-v
See
rm --help
.
NB a file called
-v
in a directory
can mess up
grep
when using wild cards on grep's command line.
How do I find my _SC_PAGESIZE system page size?
getconf PAGESIZE
Emerald LSF
clean up and look up DOI
Convert internet address ipv4 to country
Unix GraphicsMagick-1.3.17 and AVI
OpenCV 2.4.3 failed to read AVI files under unix
.
cmake
problems
video.google.co.uk dead
gawk
fatal: `\p\P\o\p\S\i\z\e\' is not a legal variable name
comment
problems
nvcc error : 'ptxas' died due to signal 24
NiftyReg install:
follow
http://www.cs.ucl.ac.uk/staff/M.Modat/Marcs_Page/install.html
but ensure you use at least ccmake 2.8,
e.g.
/usr/opt/cmake/2.8.3/bin/ccmake
Remember to set
CMAKE_INSTALL_PREFIX
How fast is my CPU?
Look in
/proc/cpuinfo
And how much memory?
Look in
/proc/meminfo
In a C program at runtime, how can I find out the clock frequency of the core it is running on?
Find current
cpuid
and look in
/proc/cpuinfo
WARNING: Some cpuid() information is static.
(See
base_max_frequency.c
).
On modern Intel multi-core servers individual core's clock
speed vary rapidly. Mostly Intel's EAX reports static information.
CUDA runtime
unknown error.
CUDA compile time
error: incomplete type is not allowed
,
shared memory
,
ptxas error
,
no __ldg
glibc
gnuplot
tips
How to disable yellow popup box in gmail when using
firefox
How to strip comments from C code using
(see 23 March 2014 near bottom).
how to find symbols in libc.so?
nm
libc*
(unsolved) Failure of MSF Radio Controlled
HD-1688 Sheng-Bang Wall Clock
so that it runs continuously and never sets the time.
Radio Controlled Oregon Scientific
starts to fail to set time from radio broadcast.
Without radio time signal clock drifts quite quickly from true time.
Lots of chat on the internet (including the National Physical Laboratory NPL)
saying radio clocks can lose their signal, eg inside buildings.
Clock had not been moved, so why signal loss?
It seems the answer is interference from broadband WiFi internet router.
When placed 11 meters from new router,
after a while clock picks up radio signal
and synchronises.
How to disable JavaScript in FireFox 24.5.0?
Enter about:config in URL tool bar.
Find
java
, double click
javascript.enabled
true
so that it becomes
false
.
Now does anyone know how to turn off the point-less tool tip
animations in DBLP?
BWA [infer_isize] fail to infer insert size: too few good pairs
Did you try and align human DNA against the yeast genome?
error: 'for' loop initial declaration used outside C99 mode
Add
-std=gnu99
to
gcc
command line.
error: _mm512_cmpneq_ps_mask was not declared in this scope
In the GNU C compiler g++ 8.3.1 AVX Intel intrinsics include library
avx512fintrin.h
_mm512_cmpneq_ps_mask
is only defined if
__OPTIMIZE__
is define.
Hence problem can occur when try to compile for debug
without optimisation
.
Work around is to take copy of
_mm512_cmpneq_ps_mask
from
avx512fintrin.h
xfig export
any image causes
xfig
to abort with status code 2
Is /tmp/ full?
gimp Scanjob_20140723_113245.pdf
fails saying
GIMP Message
Opening 'file name' failed: Plug-In could not open image
Possible Work Around
Convert the file from pdf to postscript, eg
pdftops Scanjob_20140723_113245.pdf Scanjob_20140723_113245.ps
Use gimp to add transparency to an existing PNG
Select area (eg white border). Use menu
Layer | Transparency | Color to Alpha
Based
on
How do I merge png and eps
Use gimp.
Scale .png, eg using ImageMagick convert,
to be same size as .eps
%%BoundingBox:
In gimp open backgound PNG file first.
Then open encapsulated postscript file as layer.
Export combined image.
ImageMagick's
convert -transparent white
fails to create transparent gif.
Many gif's with white backgrounds are not exactly "white".
The following will work if the GIF contains only one shade of white as
background colour, unfortunately scans often have multiple
RGB values for the background colour. Try and see how well it works
for your image.
xv
's colour map will show you actually what RGB value it has.
Alternatively
Wikipedia
suggests the GIF colour map ends at byte (hex) 30A--30C.
hexdump -c
gives the bytes in octal.
hexdump -c silver_humie_2014.gif2 | more
0000300 377 377 376 364 374 377 373 377 375 377 376 377 374
Convert 0376 0377 0374 to hex. Eg:
gawk 'END{printf "#%x%x%x\n", 0376, 0377, 0374}' /dev/null
and then use with
convert -transparent
.
convert x2.gif -transparent #fefffc x3.gif
How do I get rid of left margin indentation in LaTeX verbatim environment?
\setlength{\verbatimindent}{0pt}
before
\begin{verbatim}
(it also seems to work in figure and floating ).
How do I convert postscript to plain text?
ps2ascii test.ps > test.txt
How do I print wide text files?
a2ps -1 --landscape -l190
(see also
man a2ps
)
How do I extract pages from PDF?
pdftk e.g.
pdftk file.pdf burst
pdftk file.pdf cat 1 3-23 output out.pdf
To join PDFs
pdftk pg_0001.pdf pg_0002.pdf cat output out.pdf
pdftops
followed by
psselect
.
psselect -p1,3,5,7 Scan_to_USB_74_20151112_125528.ps > t.ps
Other PDF
hints
Uploading bibtex into
RPS
! Package natbib Error: Bibliography not compatible with author-year citations.
(natbib) Press
to continue in numerical citation style.
See the natbib package documentation for explanation.
Type H
for immediate help.
l.210 ...and\NAT@force@numbers{}\NAT@force@numbers
Perhaps one of your bibtex entries does not have a year?
Perhaps add year as
n.d.
?
Perhaps missing comma before year in \bibitem[] ?
Solutions to problems with
C code
Solutions to problems with
GDB
Solutions to problems with
Clang
Solutions to problems with
acmart.cls
No solution to problems with
CoolProp
Solutions to problems with
Open Babel
Solutions to problems with
bloa magpie
Solutions to problems with
perf run time library
Solutions to problems with
shoco compression
Solutions to problems with
JavaScript
problems with
PROJ4
Linux FireFox 91.2 not playing
sound
on videos
