Recent questions tagged linux

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linux - how to replace all lines between two points and subtitute it with some text in sed

Suppose I have this text: BEGIN hello world how are you END How to convert it to bellow text using sed command in linux: BEGIN fine, thanks END 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 find binary files in a directory?

I need to find the binary files in a directory. I want to do this with file, and after that I will check ... or what should I check with grep? 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 is dd with the 'direct' (O_DIRECT) flag so dramatically faster?

I have a server with a RAID50 configuration of 24 drives (two groups of 12), and if I run: dd if=/dev/ ... the page cache? Is this atypical? See Question&Answers more detail:os...

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

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584 views

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linux - How to extract numbers from a string?

I have string contains a path string="toto.titi.12.tata.2.abc.def" I want to extract only the numbers from ... extract a number with one step? See Question&Answers more detail:os...

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

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667 views

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linux - Draw Overlay in Android (system wide)

Is there a way to draw an overlay window always on top of any android application? I am using Android ... overlay should receive all events. See Question&Answers more detail:os...

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

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935 views

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linux - Assembly x86 brk() call use

I am trying to dynamically allocate memory into the heap and then assign values in those memory addresses. ... in rax into brk_firstLocation See Question&Answers more detail:os...

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

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750 views

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linux - whiptail: How to redirect output to environment variable?

I'm trying to use whiptail as it's a lightweight alternative to dialog and seems to be installed by default ... in advance for your feedback. 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 - Mysql datetime DEFAULT CURRENT_TIMESTAMP error

1. When I ran this MYSQL syntax on windows it ran properly: CREATE TABLE New ( id bigint NOT NULL ... systems? Or any alternative approach? 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 - Application 'appname' failed to start (port 8080 not available) on open shift node app

I have written a node restify server in coffee and I can't seem to get it running. While deploying I get ... .router.mounts, 'restify') return See Question&Answers more detail:os...

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

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502 views

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linux - Are Unix reads and writes to a single file atomically serialized?

I'd like to know if the writes upon a single file get done atomically such that write("bla bla") and a ... know what read and write do exactly. See Question&Answers more detail:os...

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

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525 views

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linux - munmap() failure with ENOMEM with private anonymous mapping

I have recently discovered that Linux does not guarantee that memory allocated with mmap can be freed with munmap if ... malloc_vma[i]); } } See Question&Answers more detail:os...

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

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601 views

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linux - Saving gmon.out before killing a process

I would like to use gprof to profile a daemon. My daemon uses a 3rd party library, with which it registers ... killed with SIGTERM or SIGKILL ? See Question&Answers more detail:os...

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

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486 views

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linux - Why can't files be manipulated by inode?

Why is it that you cannot access a file when you only know its inode, without searching for a file that links ... . Why is it not provided? See Question&Answers more detail:os...

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

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596 views

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linux - Installing Jenkins Plugins to Docker Jenkins

I have the following Dockerfile with jenkins as the base image: FROM jenkins USER root ENV JENKINS_MIRROR ... plugins in $JENKINS_HOME/plugins? See Question&Answers more detail:os...

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

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612 views

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linux - UID of script "/home/...../public_html/index.php" is smaller than min_uid

I just moved magento from local to server and Im getting the following error, I was just wondering if someone ... database. 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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686 views

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linux - Add text between two patterns in File using sed command

I want to add Some large code between two patterns: File1.txt This is text to be inserted into the File. infile. ... '/First/,/Second/!d' infile 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 - Loops/timers in C

How does one create a timer in C? I want a piece of code to continuously fetch data from a gps parsers output ... or should it be self written? See Question&Answers more detail:os...

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

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690 views

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linux - Minimal core dump (stack trace + current frame only)

Can I configure what goes into a core dump on Linux? I want to obtain something like the Windows mini-dumps ... google breakpad is not an option See Question&Answers more detail:os...

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

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472 views

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linux - Can you enter x64 32-bit "long compatibility sub-mode" outside of kernel mode?

This might be an exact duplicate of Is it possible to execute 32-bit code in 64-bit process by doing mode-switching?, ... ,r}si 0xC3 // ret }; See Question&Answers more detail:os...

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

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1.3k views

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linux - String replacement in bash - bad substitution error

I newbie in bash scripting but i don't uderstand why it's not work #!/bin/bash foo=foobarfoobar echo ${ ... } bad substitution error on line 3 See Question&Answers more detail:os...

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

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501 views

1 answer

linux - apt-get install for different python versions

I have ubuntu 10.04 with python2.6 by default. I have installed python2.7. When I want to install python ... python2.7 with apt-get install. See Question&Answers more detail:os...

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

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944 views

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linux - Starting point for CLOCK_MONOTONIC

As I understand on Linux starting point for CLOCK_MONOTONIC is boot time. In my current work I prefer to use ... linux system using api calls? See Question&Answers more detail:os...

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

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1.1k views

1 answer

linux - glibc: elf file OS ABI invalid

downloaded and compiled glibc-2.13. when i try to run a sample C program which does a malloc(). I get following ... version is linux-2.6.35.9 See Question&Answers more detail:os...

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

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527 views

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linux - Detect in C if outputting to a terminal

I'm writing a C program for OS X and Linux, and I want to tweak the output based on whether or not it's going to ... do I do it in a C program? See Question&Answers more detail:os...

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

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574 views

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linux - Redirecting command output to a variable in bash fails

I'm trying to redirect command output to a variable: OUTPUT=$(sudo apache2ctl configtest) and then to read it: echo ... i do to make it work? See Question&Answers more detail:os...

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

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556 views

1 answer

linux - Execute command on remote server via ssh

I am attempting to execute a command on a remote linux server via an ssh command on a local server like this: ... it takes to connect via ssh? 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

1 answer

linux - printing over network from PHP app

I have a set of printers connect over a network with Static IP assigned to each printer. Now i have a PHP web ... and how do i go about 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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397 views

1 answer

linux - What's the difference between: ". [script]" or "source [script]", "bash [script] or $SHELL [script]", and "./ [script]" or "[script]"?

I know that source and . do the same thing, and I would be surprised to learn if the other pairs of commands ... like to think it's original." See Question&Answers more detail:os...

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

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