Recent questions tagged linux

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linux - In C, what's the size of stdout buffer?

Today I learned that stdout is line buffered when it's set to terminal and buffered in different cases. So, in ... buffer, how big is this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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linux - BASH: How to find no. of days (considering only "Network / Business Days") between two dates (i.e. exclude weekends Saturday/Sunday)

RHEL 7.5 BASH GNU bash, version 4.2.46(2)-release (x86_64-redhat-linux-gnu) In MS Excel, I'm able ... the difference in days between two dates? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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linux - gem5 syscall emulation arm C hello world fails with "fatal: syscall gettid (#224) unimplemented"

I am having the following error in gem5. This happens in ARM only. With X86 I see some syscalls being ignored but ... so there must be a way. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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linux - Java exec() does not return expected result of pipes' connected commands

I'm calling command line programs connected by pipes. All this works on Linux for sure. My method: protected ... final result of the output? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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linux - On OS X, simple C++ program gives incorrect results (which are a result of command-line options 'c++03' vs 'c++11')

This simple program (when compiled on Linux) will CORRECTLY give two different answers based on whether it's compiled ... in one of the answers. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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linux - How to export a variable in Bash

I need to set a system environment variable from a Bash script that would be available outside of the current ... though. Is this possible? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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linux - How do I output my host’s IP addresses from a C program?

I need to display all the IP addresses from my local computer, using the C language. How can this be done? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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linux - Pattern match does not work in bash script

Using the pattern match !("file1") does not work within a bash script but will work on the command line. For ... this not work in a script? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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linux - Why doesn't "sort file1 > file1" work?

When I am trying to sort a file and save the sorted output in itself, like this sort file1 > file1; the ... the first case is not working? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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linux - Bash script to remove 'x' amount of characters the end of multiple filenames in a directory?

I have a list of file names in a directory (/path/to/local). I would like to remove a certain number of ... do not have much experience with it. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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linux - Why redirect stdin inside a while read loop in bash?

Consider the following sample script: #!/bin/sh do_something() { echo $@ return 1 } cat <<EOF > ... from Debian's cryptdisks_start script. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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linux - What does O_DIRECT really mean?

If I open a file with O_DIRECT flag, does it mean that whenever a write(blocking mode) to that file returns, the data is on disk? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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linux - Need to remove the count from the output when using "uniq -c" command

I am trying to read a file and sort it by number of occurrences of a particular field. Suppose i want to find ... only 23/Dec/2008:19:20 Thanks See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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linux - Couldn't install netbeans 11.3 with Java 14 due to Error: "Unsupported JVM version"

I'm trying to install netbeans with Java 14. I'm getting below error - > sudo ./Apache-NetBeans-11.3-bin-linux ... a How can I fix this problem? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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527 views

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linux - Why do shells ignore SIGINT and SIGQUIT in backgrounded processes?

If I background a processes in a script or a -c snippet, the backgrounded processes ignores SIGINT and SIGQUIT: ... ? Can it be disabled? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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492 views

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linux - Variable in Bash Script that keeps it value from the last time running

Can I create a Bash script with persistent variable-values? For example, I initialize a variable with 0 when the ... time the script is running. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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535 views

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linux - Read file with timeout in Python

Within Linux, there is a file, /sys/kernel/debug/tracing/trace_pipe, which as the name says, is a pipe. So, ... second, give up and return"? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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531 views

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linux - Curl : connection refused

I got the following error while running curl: curl: (7) Failed to connect to 127.0.0.1 port 8080: Connection ... an idea about it ? Thank you. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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395 views

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linux - C: Different implementation of clock() in Windows and other OS?

I had to write a very simple console program for university that had to measure the time required to make an ... work this way on Windows? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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568 views

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linux - sort not sorting as expected (space and locale)

I want to sort a text file through linux sort, that looks like this v 1006 v10 1 v 1011 I would expect ... reason it is kept in the middle? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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444 views

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linux - How do I use GDB in Eclipse for C/C++ Debugging?

I'm a Visual Studio user and am used to breakpoints for debugging. I'm now working in a linux environment and am ... do I use gdb in eclipse? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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616 views

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linux - Using "$RANDOM" to generate a random string in Bash

I am trying to use the Bash variable $RANDOM to create a random string that consists of 8 characters from a variable ... . How can I do that? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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linux - Multithreaded fork

Can fork() function be used to replicate a multithreaded process. And if so, will all threads be exactly the same ... which can do it for me? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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linux - Docker: Are Docker links deprecated?

When reading about linking containers together they now call it legacy links e.g. here. This article claims links ... should I stop use them? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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526 views

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linux - What are the rules for valid identifiers (e.g. functions, vars, etc) in Bash?

What are the syntax rules for identifiers, especially function and variable names, in Bash? I wrote a Bash script and ... How can I avoid this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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494 views

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linux - Hardware cache events and perf

When I run perf list I see a bunch of Hardware Cache Events, as follows: $ perf list | grep 'cache event' ... not for "Hardware cache events". See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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449 views

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linux - Symbols from convenience library not getting exported in executable

I have a program, myprogram, which is linked with a static convenience library, call it libconvenience.a, which ... what is going on here? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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588 views

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linux - Creating a bootable ISO image with custom bootloader

I am trying to convert a bootloader I wrote in Assembly Language to an ISO image file. The following is the code ... .bin file to an ISO image? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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