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Tag: linux
How to get CPU Utilization number from top?
How would I get the number for CPU Utilization from running the top command on a specific user? Answer Pipe top to awk and add up the CPU utilization column: That awk command says “For rows (from top) greater than row 7, add up the number in field 9 $9 and store it in variable sum. Once you have gone
Negative lookbehind assertion regex has unexpected result with grep -P
I’m testing the following negated lookbehind assertion and I want to understand the result: it prints out I was expecting that only the two first foo would be printed, ‘echo foo foofoo’ but not the third one, because my assertion is supposed to mean find ‘foo’ that is not precede…
Each process has its own kernel stack, right?
I saw some SO questions come with a conclusion: Each process has its own kernel stack. But how about this code? Or how about this one? Whether does this program also have a corresponding kernel stack? More: For the 1st code above, I tested it like below. Press Ctrl+C to stop it, and see that system time is le…
Why does octal dump output the ascii code for an integer variable instead of the binary code?
This is the code in C to input a character and integer variable to a file. So lets say the file name is text and the od command is invoked.. This is the output of the command Why does it print the ASCII values for both of the value 40 and not the hex code 0028 for the integer variable?
How does dynamic linker changes text segment of process?
If i understand correctly when user tries to execute dynamically linked executable (with execve(“foo”, “”, “”)) instead of loading text segment of “foo” dynamic linker is loaded (ld-linux.so.2) and executed. It have to load libraries required for program (“…
sysfs_create_group(): Where to call?
currently i write an driver module which offers some entries in the sysfs. I read a lot through the driver source tree and the internet. I found two approches where the sysfs_create_group() is called: a) most commonly: In the probe() function of the Driver. Like adviced here How to attach file operations to s…
Finding the number of xml files having a particular word in a directory
I read Chris Maes answer on how to a grep for a particular word in any file/files contained in a directory, and it worked. But, what is the way of finding the names of the files and the total number of files containing that word ? Please correct me if I am wrong. Thanks in advance !! Answer You just
install atom on centos 7 without admin privileges
If it is possible could someone show me how to get the editor Atom working on CentOS Linux release 7.x. I’m working on a computing cluster so I don’t have sudo privileges. The instructions here: https://github.com/atom/atom/blob/master/docs/build-instructions/linux.md seem to require sudo privileg…
how to delete all files in directory except one folder and one file?
I have application which has one folder called vendor and one file called .env. When ever i automatically publish my source code files to folder, all old files should get deleted except these two. How can i do this in linux by using shell? PS : I am trying to implement rollback mechanism in Jenkins. I will co…