Well there is a project introducing something like Linux’s binfmt_misc to OS X so now what you need is an ELF loader, a dynamic linker that can load both Mach-O and ELF, and some mechanism to translate Linux calls to OS X ones. Just for inspiration, you can implement the dynamic linker in the fashion … Read more
You should definitely store the files in subdirectories. EXT4 and XFS both use efficient lookup methods for file names, but if you ever need to run tools over the directories such as ls or find you will be very glad to have the files in manageable chunks of 1,000 – 10,000 files. The inode number … Read more
On Debian and Ubuntu: apt-get source coreutils More generally: http://ftp.gnu.org/gnu/coreutils/
Bash seems perfectly happy with variables as array indexes: $ array=(a b c) $ arrayindex=2 $ echo ${array[$arrayindex]} c $ array[$arrayindex]=MONKEY $ echo ${array[$arrayindex]} MONKEY
Fixed this issue by setting the limits for all users in the file : $ cat /etc/security/limits.d/custom.conf * hard nofile 550000 * soft nofile 550000 REBOOT THE SERVER after setting the limits. VERY IMPORTANT: The /etc/security/limits.d/ folder contains user specific limits. In my case hadoop 2 (cloudera) related limits. These user specific limits would override … Read more
From an answer on Quora by Jonathan Klein, 12ms for a 1500 line .htaccess file: Having a large .htaccess does have a cost. Ours is currently ~1500 lines and we benchmarked the time spent parsing it at around 10-12ms on a production webserver. Hardware makes a difference obviously, but you can fairly safely assume that … Read more
unzip myfile.zip extracts files in the working directory by keeping path names from the zip file. So if you get a subdirectory myfile it means it is part of the relative path of compressed files. Check it by listing the zip content unzip -l myfile.zip So you can unzip the file from the directory above, … Read more
sdaau, the command you used for trying to convert your PDF to CMYK was not correct. Try this one instead: gs \ -o test-cmyk.pdf \ -sDEVICE=pdfwrite \ -sProcessColorModel=DeviceCMYK \ -sColorConversionStrategy=CMYK \ -sColorConversionStrategyForImages=CMYK \ test.pdf Update If color conversion does not work as desired and if you see a message like “Unable to convert color space … Read more
Assuming your kernel was built with the IKCONFIG option, you can use the scripts/extract-ikconfig tool to extract the original .config file. Alternately, you can boot that kernel and find the embedded configuration in /proc/config.gz.
find / -type f -name filename.ext -exec grep -l ‘lookingfor’ {} + Using a + to terminate the command is more efficient than \; because find sends a whole batch of files to grep instead of sending them one by one. This avoids a fork/exec for every single file which is found. A while ago … Read more