Recent questions tagged Linux

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linux - Passing variables in remote ssh command

I want to be able to run a command from my machine using ssh and pass through the environment variable ... the value of $BUILD_NUMBER ? 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 - Hierarchical ldd(1)

Due to using Gentoo, it often happens that after an update programs are linked against old versions of libraries. ... library that I upgraded. 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 - extracting unique values between 2 sets/files

Working in linux/shell env, how can I accomplish the following: text file 1 contains: 1 2 3 4 5 text ... from the command line? many 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 - couldn't connect to server 127.0.0.1 shell/mongo.js

when i setup mongodb in my ubuntu , i try : ./mongo it show this error : couldn't connect to server 127.0.0.1 ... .js so what can i do , 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 - Run text file as commands in Bash

If I have a text file with a separate command on each line how would I make terminal run each line as a ... 1 sudo command 2 sudo command 3 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 - Tell Composer to use Different PHP Version

I've been stuck at this for a few days. I'm using 1and1 hosting, and they have their PHP set up a bit ... on my GoDaddy domain, but not 1and1. 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 - Rename files and directories recursively under ubuntu /bash

I want to rename all files and directories that contain the word "special" to "regular". It should maintain ... do this in bash recursively? 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 - using awk with column value conditions

I'm learning awk from The AWK Programming Language and I have a problem with one of the examples. If I ... 't return anything. Any thoughts? 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 use CMAKE_INSTALL_PREFIX

I want to generate Makefile with install target, making installation to /usr instead of default /usr/ ... TARGETS mylibrary DESTINATION lib) 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 remove newlines from a text file?

I have the following data, and I need to put it all into one line. I have this: 22791 ; 14336 ; 22821 ; ... ;14336 ;22821 ;34653 ;21491 ;25522 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 'soname' option for building shared libraries for?

I learned the "Program Library HOWTO". It mention that using soname to manage the version like follow. gcc -shared - ... . What else can it do? 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 - Check if a variable exists in a list in Bash

I am trying to write a script in bash that check the validity of a user input. I want to match the input (say ... while I would want it to fail. 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 redirect stderr and stdout to different files in the same line in script?

I know this much: $ command 2>> error $ command 1>> output Is there any way I can output the stderr to the ... file in the same line of 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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linux - How to check if a file is empty in Bash?

I have a file called diff.txt. I Want to check whether it is empty. I wrote a bash script something like ... touch full.txt rm emtpy.txt fi 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 substitute shell variables in complex text files

I have several text files in which I have introduced shell variables ($VAR1 or $VAR2 for instance). I would ... Ant for instance) Kind regards 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 - Concatenating Files And Insert New Line In Between Files

I have multiple files which I want to concat with cat. Let's say File1.txt foo File2.txt bar File3.txt qux I want ... 's the right way to 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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linux - Run bash script as daemon

I have a script, which runs my PHP script each X times: #!/bin/bash while true; do /usr/bin/php -f ./my- ... done How can I start it as daemon? 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 - Add file extension to files with bash

What is the good way to add file extension ".jpg" to extension-less files with 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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linux - Find files and tar them (with spaces)

Alright, so simple problem here. I'm working on a simple back up code. It works fine except if the files have ... a different way to fix 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 do I find out what all symbols are exported from a shared object?

I have a shared object (dll). How do I find out what all symbols are exported from that? 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 - Move all files except one

How can I move all files except one? I am looking for something like: 'mv ~/Linux/Old/!Tux.png ~/Linux/New/ ... Is there some tool for the job? 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 - Context switch internals

I want to learn and fill gaps in my knowledge with the help of this question. So, a user is running a ... each kernel-thread or each 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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linux - Run cron job only if it isn't already running

I'm trying to set up a cron job as a sort of watchdog for a daemon that I've created. If the daemon errors out ... is a better way to 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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linux - Find the files that have been changed in last 24 hours

E.g., a MySQL server is running on my Ubuntu machine. Some data has been changed during the last 24 hours. ... , file sizes, and modified 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 - How to copy a file to multiple directories using the gnu cp command

Is it possible to copy a single file to multiple directories using the cp command ? I tried the following , which ... using the gnu cp command? See Question&Answers more detail:os...

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

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1.4k views

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linux - How to determine SSL cert expiration date from a PEM encoded certificate?

If I have the actual file and a Bash shell in Mac or Linux, how can I query the cert file for when it will ... csr, key, pem and chain files. 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 search contents of multiple pdf files?

How could I search the contents of PDF files in a directory/subdirectory? I am looking for some command line tools. ... can't search PDF files. 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 - Recursively look for files with a specific extension

I'm trying to find all files with a specific extension in a directory and its subdirectories with my bash ( ... error? But this curly brace See Question&Answers more detail:os...

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

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