Recent questions tagged Linux

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linux - How do I deal with a filename that starts with the hyphen (-) character?

Somehow, at some point, I accidentally created a file in my home directory named '-s'. It is about 500 kb ... command line was the only option. 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 - Round a divided number in Bash

How would I round the result from two divided numbers, e.g. 3/2 As when I do testOne=$((3/2)) $testOne contains ... as the answer from 3/2=1.5 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 manage Perl modules when using a package manager?

A recent question here on SO got me thinking. On most Linux distributions that I tried, some Perl modules would ... anything via the cpan shell? 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 - Running a JAR file without directly calling `java`

I am deploying a command-line tool that is written in Java that accepts command-line arguments. I have it ... jar arg1 -arg2 Thanks, Brian 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 Time Zone is messed up

I am running a Tomcat application, and I need to display some time values. Unfortunately, the time is ... should be a configuration solution. 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 - Is there a way to get gcc to output raw binary?

Is there a set of command-line options that will convince gcc to produce a flat binary file from a self- ... except 32-bit protected mode. 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 overhead of a context-switch?

Originally I believed the overhead to a context-switch was the TLB being flushed. However I just saw on ... penalty of a context-switch) 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.sock permission denied

When I try to run simple docker commands like: $ docker ps -a I get an error message: Got permission denied ... ... message. How can I fix 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 - How to prevent writer starvation in a read write lock in pthreads

I have some questions regarding read-write locks in POSIX Pthreads on a *nix system, say Linux for example. I ... for your help and patience :) 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 prompt with the last exit code

I've been trying to customize my Bash prompt so that it will look like [feralin@localhost ~]$ _ with colors. I ... to use the last exit code? 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 get file creation date/time in Bash/Debian?

I'm using Bash on Debian GNU/Linux 6.0. Is it possible to get the file creation date/time? Not the ... both only give the modification time. 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 - Take nth column in a text file

I have a text file: 1 Q0 1657 1 19.6117 Exp 1 Q0 1410 2 18.8302 Exp 2 Q0 3078 1 18.6695 Exp 2 Q0 ... files. Is there a simpler way to do 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 - Pipe output to bash function

I have as simple function in a bash script and I would like to pipe stdout to it as an input. jc_hms(){ printf " ... S1 }' | jc_hms` like so. 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 - Git and hard links

Considering that Git does not recognize symbolic links that point outside of the repository, is there any ... me to detailed information? See Question&Answers more detail:os...

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

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491 views

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linux - Using the passwd command from within a shell script

I'm writing a shell script to automatically add a new user and update their password. I don't know how to get ... . adduser $1 passwd $1 $2 $2 See Question&Answers more detail:os...

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

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605 views

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linux - How to preserve line breaks when storing command output to a variable?

I'm using bash shell on Linux. I have this simple script #!/bin/bash TEMP=`sed -n '/'"Starting ... preserve the line breaks/carriage returns? See Question&Answers more detail:os...

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

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754 views

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linux - Pipe only STDERR through a filter

Is there any way, in bash, to pipe STDERR through a filter before unifying it with STDOUT? That is, I ... > terminal/file/whatever STDERR ────┘ See Question&Answers more detail:os...

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

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662 views

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linux - How to use /dev/random or urandom in C?

I want to use /dev/random or /dev/urandom in C. How can I do it? I don't know how can I handle them ... knows please tell me how. 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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435 views

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linux - Call Python script from bash with argument

I know that I can run a python script from my bash script using the following: python python_script.py But what ... to python when I call 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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482 views

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linux - How to split CSV files as per number of rows specified?

I've CSV file (around 10,000 rows ; each row having 300 columns) stored on LINUX server. I want to ... linux command to help this conversion? See Question&Answers more detail:os...

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

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496 views

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linux - Distinguishing between Java threads and OS threads?

How do I distinguish running Java threads and native threads? In Linux there will be Parent process for every ... from another Java code? 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

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linux - What does `set -x` do?

I have a shell script with the following line in it: [ "$DEBUG" == 'true' ] && set -x See Question&Answers more detail:os...

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

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652 views

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linux - How do I create a crontab through a script

I need to add a cron job thru a script I run to set up a server. I am currently using Ubuntu. I can ... . Is it possible to do so? See Question&Answers more detail:os...

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

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969 views

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linux - "find: paths must precede expression:" How do I specify a recursive search that also finds files in the current directory?

I am having a hard time getting find to look for matches in the current directory as well as its ... current directory and its subdirectories? 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 - Android adb not found

When I run my android app from eclipse, I get this error. Unexpected exception 'Cannot run program "/home/antz/ ... ... whats wrong with adb? See Question&Answers more detail:os...

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

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427 views

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linux - "No such file or directory" error when executing a binary

I was installing a binary Linux application on Ubuntu 9.10 x86_64. The app shipped with an old version of gzip (1.2 ... 18: 08048b0c 152 FUNC WEAK DEFAULT UND fflush@GLIBC_2.0 (3)...

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

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416 views

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linux - What is a .pid file and what does it contain?

I recently come across a file with the extension .pid and explored inside it but didn't find much. The ... contained in the pid file? 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 - How to make a python, command-line program autocomplete arbitrary things NOT interpreter

I am aware of how to setup autocompletion of python objects in the python interpreter (on unix). Google shows ... windows or mac, just 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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