Recent questions tagged Linux

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linux - How would I tell a bash script to start over from the top?

For example, in the below script startover starts back from the top: ... script. 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 - Unable to use local and remote variables within a heredoc or command over SSH

Below is an example of a ssh script using a heredoc (the actual script is more complex). Is it ... ) echo $REMOTE_PID EOF echo $REMOTE_PID 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 - Assigning dynamic bash variable names using a for loop seq

So I'm trying to do something, not sure if it's possible. I have the following code: for i in {0..5}; ... line 16: group0=j: command not found 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 pass command line parameters from a file

I have a C program that reads command line arguments from argv. Is it possible to make a pipe to redirect ... | ./myprogram without success. 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++ : initialize input programmatically

If we have this code snippet: int a; cout << "please enter a value: "; cin >> a; And in the terminal ... simulate a user's typing in it. 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 - Mixing static libraries and shared libraries

I have a project where I have one static library libhelper.a and another with my actual shared object library, ... on static libraries? 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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linux - Without root access, run R with tuned BLAS when it is linked with reference BLAS

Can any one tell me why I can not successfully test OpenBLAS's dgemm performance (in GFLOPs) in R via ... explanations and solutions? 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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linux - Why does malloc rely on mmap starting from a certain threshold?

I was reading a little bit about malloc and found the following in the malloc's man page: Normally, malloc() ... call force a context switch? 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 - Compiled C++ program raises "cannot open shared object file" on another system though the file is present

I wrote a tiny program that requires some libraries including libboost_filesystem, libboost_program_options and libcurl. I ... other machines? 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 - Java transparent window

I am trying to create a circle-shaped window that follows the mouse and pass clicks to the underlying windows. I was ... ? (I'm on Linux KDE4) 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 - What's the opposite of od(1)?

Say I have 8b1f 0008 0231 49f6 0300 f1f3 75f4 0c72 f775 0850 7676 720c 560d 75f0 02e5 ce00 0861 1302 0000 ... copying+pasting into a hex editor? 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 - Can I call accept() for one socket from several threads simultaneously?

I am using Linux 3.2.0, x86_64. Can I call accept() for one socket from several threads simultaneously? 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 can I get the interface name/index associated with a TCP socket?

I'm writing a TCP server that needs to know which interface each connection arrived from. I cannot use the ... a very extreme IP scheme. See Question&Answers more detail:os...

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

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578 views

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linux - Python in raw mode stdin print adds spaces

I needed to switch the standard input to non-buffered mode in Python, so that I can read single ... fd, termios.TCSADRAIN, old_settings) 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 run script commands from variables?

I tried to run commands using pipes. Basic: single="ls -l" $single which works as expected Pipes: multi=" ... creating a script for execution? See Question&Answers more detail:os...

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

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779 views

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linux - Multiplication with expr in shell script

I am making a basic calculator to add, subtract, multiply, and divide. Addition works, but not multiplication. When ... ` echo $ANSWER fi exit 0 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 initialise a binary semaphore in C

In the man page it appears that even if you initialise a semaphore to a value of one: sem_init(&mySem, 0 ... may be called by different threads. 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 can I find which ELF dependency is not fulfilled?

I've built a test ELF program using the LSB SDK (note that my question is not specific to LSB): ... ) 0x4003ca 0x0000000000000000 (NULL) 0x0 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 - getrandom syscall in C not found

The problem was resolved by upgrading the C library. I would like to use the syscall getrandom (http://man7.org/linux/ ... o) it is the same.. 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 return exit code 0 from a failed command

I would like to return exit code "0" from a failed command. Is there any easier way of doing this, rather ... then return 0 else return 5 fi See Question&Answers more detail:os...

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

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792 views

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linux - Compiler can't find libxml/parser.h

I am on Debian 8 (Jessie), 64 Bit. I installed libxml2-dev, which now sits in /usr/include/libxml2/libxml ... else to make libxml2-dev visible? 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 run sbt as daemon?

I've tried nohup "sbt run" & returns : nohup: failed to run command sbt run': No such file or directory ... ? How to keep process running ? See Question&Answers more detail:os...

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

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717 views

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linux - CentOS error - sudo: effective uid is not 0, is sudo installed setuid root?

I found another question with the same headline, however, I suppose my case is a bit different. In an attempt to ... Aug 13 2015 /usr/bin/sudo 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 - Removing sensitive data from Git. "fatal: ambiguous argument 'rm'"

I'm trying to run this command: git filter-branch --force --index-filter 'git rm --cached --ignore-unmatch filename.js' ... ..] -- [<file>...]' 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 get day of the year in shell?

How can I get the day of the year in shell? date '+%V' will give me the week of the year, which is 15 for ... need to find the day of the year! See Question&Answers more detail:os...

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

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725 views

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linux - bash double bracket issue

I'm very new to bash scripting and am running into an issue when using double brackets. I can't seem ... would be greatly appreciated. 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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545 views

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linux - How the share library be shared by different processes?

I read some documents that share library comiled with -fPIC argument, the .text seqment of the .so will be ... experiment? 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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671 views

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linux - Read a single sector from a disk

I am trying to read a single specific sector from the disk directly. I've currently run out of ideas and any ... go about it would be great! See Question&Answers more detail:os...

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

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