Recent questions tagged linux

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I want to use wget to upload a picture to a distant server, using an authentication token, ' ... ="AUTH_1624582364932749DFHDD" Any suggestions? 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 sort a file, based on its numerical values for a field?

Example file.txt: 100 foo 2 bar 300 tuu When using sort -k 1,1 file.txt, the order of lines will ... based on the absolute numerical value? 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 do we need a bootloader in an embedded device?

I'm working with ELinux kernel on ARM cortex-A8. I know how the bootloader works and what job it's doing ... why are we following the procedure? 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 - Protocol Buffer over socket in C++

I am trying to explore Protocol Buffer (PB) in Linux platform and my coding language is C++. I found ... read packet using Protocol Buffer. 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's the purpose of each of the different UIDs a process can have?

Real UID, effective UID, and some systems even have a "saved UID". What's the purpose of all these, especially the last 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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linux - How to run a bash script from C++ program

Bash scripts are very useful and can save a lot of programming time. So how do you start a bash script in a ... that would be nice also. 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 - Shell - Write variable contents to a file

I would like to copy the contents of a variable (here called var) into a file. The name of the file is stored ... . How do I get around 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 - How to append the output to a file?

How can I do something like command > file in a way that it appends to the file, instead of overwriting? 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 execute a remote command over ssh with arguments?

In my .bashrc I define a function which I can use on the command line later: function mycommand() { ssh ... given to mycommand to test.sh? 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 kernel - redis bgsave failed because fork Cannot allocate memory

all: here is my server memory info with 'free -m' total used free shared buffers cached Mem: 64433 49259 ... to make fork return success ? 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 - Creating subdomains in Amazon EC2

How can I create subdomains on Amazon EC2? Is adding virtual host in httpd.conf is enough.. or any other changes also needs to be done? 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 - Get all modules/packages used by a python project

I have a python GUI application. And now I need to know what all libraries the application links to. So ... are linked from my application? 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 run a cron job inside a docker container

I tried to run a cron job inside a docker container but nothing works for me. My container has only cron. ... container runs with /bin/bash. See Question&Answers more detail:os...

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

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391 views

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linux - How can I see which CPU core a thread is running in?

In Linux, supposing a thread's pid is [pid], from the directory /proc/[pid] we can get many useful ... sleeping tasks for each CPU core? 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 you run a script on login in *nix?

I know I once know how to do this but... how do you run a script (bash is OK) on login in unix? See Question&Answers more detail:os...

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

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370 views

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linux - Merge PDF's with PDFTK with Bookmarks?

Using pdftk to merge multiple pdf's is working well. However, any easy way to make a bookmark for each ... bookmark for each individual pdf. See Question&Answers more detail:os...

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

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407 views

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linux - unix - head AND tail of file

Say you have a txt file, what is the command to view the top 10 lines and bottom 10 lines of file simultaneously? ... 10 and 190-200 in one go. See Question&Answers more detail:os...

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

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451 views

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linux - Makefile that distinguishes between Windows and Unix-like systems

I would like to have the same Makefile for building on Linux and on Windows. I use the default GNU make on ... didn't find the answer 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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428 views

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linux - Asynchronous shell commands

I'm trying to use a shell script to start a command. I don't care if/when/how/why it finishes. I want ... get back to my shell immediately... 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 is the difference between -I and -L in makefile?

What is the usage of the -I and -L flags in a 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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382 views

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linux - Setting the Vim background colors

When I try to change the background colors in .vimrc or directly in Vim using the command: set background= ... allows only few standard ones. See Question&Answers more detail:os...

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

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470 views

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linux - How to use grep efficiently?

I have a large number of small files to be searched. I have been looking for a good de-facto multi-threaded ... grep -R "string" >> Strings See Question&Answers more detail:os...

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

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487 views

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linux - How do I delete all lines in a file starting from after a matching line?

I have a file which is made up of several lines of text: The first line The second line The third line The fourth ... , how else should I do 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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705 views

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linux - don't fail jenkins build if execute shell fails

As part of my build process, I am running a git commit as an execute shell step. However, if there are no ... this is the case. Any ideas? See Question&Answers more detail:os...

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

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475 views

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linux - Finding Docker container processes? (from host point of view)

I am doing some tests on docker and containers and I was wondering: Is there a method I can use to find ... is a set of virtualized processes. See Question&Answers more detail:os...

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

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843 views

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linux - Getting pids from ps -ef |grep keyword

I want to use ps -ef | grep "keyword" to determine the pid of a daemon process (there is a unique string in ... it? (pidof or pgrep doesnt work) See Question&Answers more detail:os...

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

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680 views

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linux - How would I get a cron job to run every 30 minutes?

I'm looking to add a crontab entry to execute a script every 30 minutes, on the hour and 30 minutes past the ... ? The cron is running on OSX. See Question&Answers more detail:os...

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

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386 views

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linux - Display two files side by side

How can 2 unsorted text files of different lengths be display side by side (in columns) in a shell Given ... or a cleaner solution potentially)? See Question&Answers more detail:os...

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

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