Recent questions tagged linux

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linux - Python: get output of the shell command 'history'

My end goal is capture the previous command executed in the terminal. Since ~/.bash_history doesn't include commands ... in the current shell? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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linux - Memory access error sys_rt_sigaction (signal handler)

Following this Interfacing Linux Signals article, i have been trying to use sys_rt_sigaction in amd64, but always get memory ... -7 `pidof bin` See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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linux - How to list first level directories only in C?

In a terminal I can call ls -d */. Now I want a c program to do that for me, like this: #include <sys/ ... ls: */: No such file or directory See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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linux - Replace every n'th occurrence in huge line in a loop

I have this line for example: 1,2,3,4,5,6,7,8,9,10 I want to insert a newline ( ) every 2nd occurrence of "," (replace the 2nd, with newline) . See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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linux - How to confirm SFTP file delivery?

I am sending a file using SFTP and public key for non-root user, looks like the file is sent, but I ... is delivered, without server access ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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linux - Get Keyboard Interrupt in C

Program: #include<stdio.h> void main() { int time=1800; while(1){ system("clear"); time-=1; printf(" ... through keyboard. Thanks in Advance.., See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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linux - Duplicated output using printf() and fork() in C

I run this small program to test fork(), and I can't figure out the output, the program's code is: ... have executed the printf() instruction. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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linux - C print file path from FILE*

FILE * fd = fopen ("/tmp/12345","wb"); If I have the variable fd , how can I print the file path ? (/tmp/12345) in Linux env. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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linux - Location of cd executable

I read that the executables for the commands issued using exec() calls are supposed to be stored in directories that ... . Where is it located? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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linux - POSIX shared memory and semaphores permissions set incorrectly by open calls

I'm trying to create a shared memory which will be used by several processes, which will not necessarily be started ... .1 Anyone got any ideas? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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700 views

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linux - Size() vs ls -la vs du -h which one is correct size?

I was compiling a custom kernel, and I wanted to test the size of the image file. These are the results: ... size? Why are they different? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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linux - AWS Lambda permission denied when trying to use ffmpeg

I want to write a handler that responds to S3 put events to convert any avi files that are uploaded to mp4. I ... it hasn't made a difference. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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610 views

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linux - using libtar library in c

I am trying to make a tar file using c. For a reason I can not use system("tar -cvf xxxx.tar xxxx"); my ... What is the problem with my c code ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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640 views

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linux - Is it possible to make a bash shell script interact with another command line program?

I am using a interactive command line program in a Linux terminal running the bash shell. I have a ... the save command works correctly. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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625 views

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linux - Match a string that contains a newline using sed

I have a string like this one: # pap which basically translates to a # pap and I want to replace it with: ... I do my replace in this situation? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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695 views

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linux - Change default C++ standard in g++

In order to compile a program in C++11 standard we need to do : g++ -std=c++11 myProgram.cpp -o ... there some easier way to do this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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linux kernel - When we use irq_set_chained_handler the irq line will be disabled or not?

When we use irq_set_chained_handler the irq line will not be disabled or not, when we are servicing the associated ... in case of request_irq. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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631 views

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linux - what's the difference between ./script.sh and bash script.sh

On linux system, is there any difference to kick of script.sh in these two different ways? Are they exactly the same thing? Thanks See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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550 views

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linux kernel - How to get specific information of an Android device from "/proc/cpuinfo" file?

How can I parse /proc/cpuinfo virtual file of my Android tablet to get information of the processor's core ... bits. Can someone please help? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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504 views

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linux - How can i show the images outside the web root directory in my php application?

I have web application in PHP using apache server, linux. For some security reason i am keeping the documents and ... , when the user login. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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534 views

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linux - Why does %rbp point to nothing?

It is known that %rsp points to the top of the stack frame and %rbp points to the base of the stack frame. ... stack if it points to nothing? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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610 views

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linux - Signal handling in asm: Why am I receiving SIGSEGV when invoking the sys_pause syscall?

I am trying to create an x86_64 assembly program that displays "SIGTERM received" whenever the SIGTERM signal is sent ... What am I doing wrong? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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684 views

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linux - python udisks - enumerating device information

It's apparently possible to get a lot of info relating to attached disks using the udisks binary: udisks -- ... serial, mount point and size. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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938 views

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linux - How to grep download speed from wget output?

I need to download several files with wget and measure download speed. e.g. I download with wget -O / ... be final output starting with FINISHED See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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709 views

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linux - Quick way to count number of instructions executed in a C program

Is there an easy way to quickly count the number of instructions executed (x86 instructions - which and how many ... a x86_64 GNU/Linux machine. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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531 views

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linux - Get GNU Octave to work with a multicore processor. (Multithreading)

I want to be able to program multiple threads with gnu octave so it will utilize multiple processors. I ... compile time flag for this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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632 views

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linux - Writing a persistent perl script

I am trying to write a persistent/cached script. The code would look something like this: ... Memoize(' ... is an expensive operation. Thanks See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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694 views

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linux - Getting disconnection notification using TCP Keep-Alive on write blocked socket

I use TCP Keep-Alive option to detect dead connection. It works well with connection that use reading sockets: ... t detect ones at all. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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