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Tag: linux
Does the qstr struct in a kernel dentry hold the filename of a Linux file?
Below is a snippet of the Linux dentry struct from http://lxr.free-electrons.com/source/include/linux/dcache.h#L150. The struct contains a member struct qstr d_name – definition below. I would like to know if this is the name of the particular file that would correspond to this dentry at runtime. What c…
Installing setuptools from source “No module named numbers” error
This is based on Install Python Flask without using pip My environment has no rpms installed or enabled, nor do I have pip, easy_install, virtualenv, etc. Based on the answer in the linked question, I need to install setuptools in order to install Jinja. To do this, I downloaded and un-tared setuptools-19.1.1…
cron-job linux apache ssl
I have a server installed with apache2 and drupal 6. In my server, I have installed a module which need to use cron. I have a SSL certificate installed too. In my crontab y have this configuration: My server work but if I write this configuration in my sites-enabled/000-default: my module with cron stops work…
How to get a single output file with N lines from N multiline files?
I am looking for some effective way to concatenate multiple multiline files into one file – here is an example for three input files: 1.txt: 2.txt: 3.txt: output.txt: (Replacing each linebreak with single whitespace). Which way can you recommend? Answer Using BASH for loop: If you want to strip one endi…
What are these unfamiliar lines in the C preprocessed file?
This is an output of the GNU cpp on a Hello World program in C. I am wondering what do these lines mean? # Number Header_File_Location [Numbers] Are these some kind of dependencies? If yes, then on what? Line numbers? Answer Those are line number directives, and tells the compiler what line and file the next …
Find command with size and time and sorted by timestamp
I have the following folder setup for example I need to recursively list them with file size, modification time and sorted by modification time recent first. I have tried the below without size… Any pointers? Answer %T+ – modification time (and date) %s – size %p – path of file
How to go back several levels history directory in linux?
Assume now in /home/dir1/dir2/dir3/dir4/dir5 I use cd jump to /home then jump to /home/dir1/dir2 i know cd – just can go back previous history directory now i want to go back /home/dir1/dir2/dir3/dir4/dir5,how can i do? Answer Use pushd /home instead of first cd /home and popd having all that navigation…
Paste header line in multiple tsv (tab separated) files
I have multiple .tsv files named as choochoo1.tsv, choochoo2.tsv, … choochoo(nth).tsv files. I also have a main.tsv file. I want to extract the header line in main.tsv and paste over all choochoo(nth).tsv files. Please note that there are other .tsv files in the directory that I don’t want to chan…
split text file (Genome data) based on column values keeping header line
I have a big genome data file (.txt) in the format below. I would like to split it based on chromosome column chr1, chr2..chrX,chrY and so forth keeping the header line in all splitted files. How can I do this using unix/linux command? genome data result Answer Is this data for the human genome (i.e. always 4…