Recent questions tagged Linux

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linux - Replace the first line in a text file by a string

I am a newbie at shell scripting, and am confused about how to use sed or any other tools to replace the first ... do I need to use sed 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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linux - How I could add dir to $PATH in Makefile?

I want to write a Makefile which would run tests. Test are in a directory './tests' and executable files ... change the $PATH in the Makefile? See Question&Answers more detail:os...

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

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435 views

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linux - perf_event_open - how to monitoring multiple events

does anyone know how to set perf_event_attr struct that can trigger PMU to monitoring multiple (type) event via ... 4 cpu cycles: 1423 See Question&Answers more detail:os...

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

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610 views

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linux - Emulate ZPL printer

To emulate ZPL printer on my mac I searched through internet for a few days. Finally I've got a solution ... another question and answer to 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 - `gcloud compute copy-files`: permission denied when copying files

I'm having a hard time copying files over to my Google Compute Engine. I am using an Ubuntu server on Google ... exited with return code [1]. See Question&Answers more detail:os...

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

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432 views

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linux - Setting up a Ubuntu/Apache/PHP machine to send email

I am working for a small Ho Chi Minh City company whose only server was just one old small computer. Now ... the right direction. -Duong Van See Question&Answers more detail:os...

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

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613 views

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linux - How to check if a program is run in Bash on Ubuntu on Windows and not just plain Ubuntu?

Pretty straightforward, the usual places to figure out the OS you're on seem to be identical to plain Ubuntu on ... if that's a foolproof idea. See Question&Answers more detail:os...

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

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503 views

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linux - Is there an invalid pthread_t id?

I would like to call pthread_join for a given thread id, but only if that thread has been started. The safe ... on a previously joined thread. See Question&Answers more detail:os...

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

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452 views

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linux - GZip every file separately

How can we GZip every file separately? I don't want to have all of the files in a big tar. 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 use ioctl() to manipulate my kernel module?

So I'm trying to write a kernel module that uses the linux/timer.h file. I got it to work inside just the module, ... %d ", fd); return 0; } See Question&Answers more detail:os...

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

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774 views

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linux - How to grep for the dollar symbol ($)?

% cat temp $$$ hello1 $$ hello2 hello3 ## hello4 hello5 $$$ % cat temp | grep "$$$" Illegal variable name. ... What should the grep string be? See Question&Answers more detail:os...

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

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431 views

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linux - How can you have a TCP connection back to the same port?

Machine is RHEL 5.3 (kernel 2.6.18). Some times I notice in netstat that my application has ... transition from SYN_SENT state to SYNC_RECEIVED 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 - Rails sends 0 byte files using send_file

I can't get send_file(Model.attachment.path) to work. It doesn't fail, instead, it sends a 0 byte size file ... instead of fake 0 byte junk. See Question&Answers more detail:os...

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

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507 views

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linux - Default field separator for awk

Sorry for this stupid question, searched but not confident is the right answer is found, so the default separator is only space for awk? See Question&Answers more detail:os...

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

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855 views

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linux - Cannot connect to X server :0.0 with a Qt application

Compiling on Fedora 10. I have just started my first qt GUI application. I used all the default settings. Its ... 0.0 Thanks for any advice, See Question&Answers more detail:os...

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

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640 views

1 answer

linux - How can I run a Windows executable from WSL (Ubuntu) Bash

Along with Windows 10 Anniversary update for summer 2016, came the possibility to run ubuntu binaries inside the ... official" GH support repo. See Question&Answers more detail:os...

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

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631 views

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linux - How to execute ssh-keygen without prompt

I want to automate generate a pair of ssh key using shell script on Centos7, and I have tried yes "y" | ... Many thanks if anyone can help ! See Question&Answers more detail:os...

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

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517 views

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linux - Trying to understand gcc's complicated stack-alignment at the top of main that copies the return address

hi I have disassembled some programs (linux) I wrote to understand better how it works, and I noticed that the ... rest seems useless to 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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535 views

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linux - What is the purpose of MAP_ANONYMOUS flag in mmap system call?

From the man page, MAP_ANONYMOUS The mapping is not backed by any file; its contents are initialized to ... MAP_ANONYMOUS with other process? See Question&Answers more detail:os...

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

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477 views

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linux - What's the difference between vim regex and normal regex?

I noticed that vim's substitute regex is a bit different from other regexp. What's the difference between 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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484 views

1 answer

linux - What does [ N ... M ] mean in C aggregate initializers?

From sys.c line 123: void *sys_call_table[__NR_syscalls] = { [0 ... __NR_syscalls-1] = sys_ni_syscall, #include <asm ... [0 ... _NR_syscalls-1]. See Question&Answers more detail:os...

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

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689 views

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linux - Can read() function on a connected socket return zero bytes?

I know that read() is a blocking call unless I make the socket non-blocking. So I expect read() call which ... for read() to return zero? See Question&Answers more detail:os...

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

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484 views

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linux - Difference between shell and environment variables

What are the differences between shell and environment variables? Where are these variables stored? See Question&Answers more detail:os...

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

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753 views

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linux - Fatal error: Can't open and lock privilege tables: Table 'mysql.host' doesn't exist

I am on a server that has afresh install on RHEL 5. I was able to install Apache and PHP just fine., ... latest versions of PHP 5 and Apache. See Question&Answers more detail:os...

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

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414 views

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linux - How do I get the absolute directory of a file in bash?

I have written a bash script that takes an input file as an argument and reads it. This file contains some paths ... an input file? (In linux.) See Question&Answers more detail:os...

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

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648 views

1 answer

linux - Getting pid and details for topmost window

Does anyone know how to get the PID of the top active window and then how to get the properties of the window ... under Linux (Ubuntu 9.10). See Question&Answers more detail:os...

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

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450 views

1 answer

linux - Reading living process memory without interrupting it

I would like to explore the memory of a living process, and when I do so, the process must not get disturbed - ... process which's pid I know ? See Question&Answers more detail:os...

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

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802 views

1 answer

linux - Bind Ctrl+Tab and Ctrl+Shift+Tab in tmux

I'm trying to a get a ctrl+tab and ctrl+shift+tab binding to work inside of a tmux session (I'm ... start with terminal names in column one" See Question&Answers more detail:os...

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

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