Recent questions tagged Linux

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linux - How can I calculate an md5 checksum of a directory?

I need to calculate a summary md5 checksum for all files of a particular type (*.py for example) placed under ... of all its sub-directories. 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 see top processes sorted by actual memory usage?

I have a server with 12G of memory. A fragment of top is shown below: PID USER PR NI VIRT RES SHR S ... the system is running 64bit OpenSuse 12. 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 ls to list directories and their total sizes

Is it possible to use ls in Unix to list the total size of a sub-directory and all its contents as opposed to ... man pages I'm coming up empty. 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 - Determine if there is Data left on the socket and discard it

I'm writing an Interface under Linux which gets Data from a TCP socket. The user provides a Buffer in which ... it waits for data or timeout? 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 `./example.sh` and `sh example.sh`

I am trying to play with bash and arrays. But executing a sample script, I got an unexpected syntax error ... the difference between the two? 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 - Allocate writable memory in the .text section

Is it possible to allocate memory in other sections of a NASM program, besides .data and .bss? Say I want ... legally. I'm running Ubuntu 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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linux - How can I look up a variable by name with #!/bin/sh (POSIX sh)?

f1="filename1"; i=1; c=f$i echo $c What shell command should I use so that echo $c returns "filename1" as the output? 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 - zero length read from file

I have two processes, one of which is writing (appending) to a file, the other is reading from it. Both ... this? This is on POSIX filesystems. 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 - Understanding Bash short-circuiting

First of all I'm not a Bash pro. I discovered few months ago that if I use both the && and || short ... it a proper way for a workaround? 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 - Standard library ABI compatibility

Suppose we have a shared library which accepts or returns some kind of std class: //lib.h #include < ... referring specifically to std::vector 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 - Can't use a variable out of while and pipe in bash

I have a code like that var="before" echo "$someString" | sed '$someRegex' | while read line do if [ ... $someRegex') echo "$var" #second echo 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 - The irq in kernel function asm_do_IRQ() is different from the one I request in module

I did some experiment with a cortex-A9 development board. I used gpio_to_irq() to get an irq num and I ... (); set_irq_regs(old_regs); } 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 - In order to write PCI ethernet driver. How to implement MMAP in the PCI Ethernet driver

In Ethernet PCI device driver if the driver allows applications to map user-space buffer to Driver virtual memory and ... in a device driver. 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 install a rpm package and its dependencies offline

I want to install a rpm package, (e.g. python 3), and all of its dependencies in a linux server that does ... connection. How can I do 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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516 views

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linux - tilde expansion in environment variable

In my .sh file, I have this, cp $file $SOME_PATH, while $SOME_PATH is exported as export SOME_PATH="~/path/to ... the tilde? Thanks in advance. 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 - Parse date in custom format

I have a date in a the %c format (could be any other) and I need to use it in the date command. %c is ... . So I will share this with 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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linux - Appending a line to a file only if it does not already exist

I need to add the following line to the end of a config file: include "/configs/projectname.conf" to a file ... the line doesn't already exist? See Question&Answers more detail:os...

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

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601 views

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linux - bash cron flock screen

I am using cron to run a bash script periodically, and trying to use flock to prevent this script and ... have the separate screens anymore. 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 jps, jinfo, jstat, jmap and jstack get information about local Java processes?

How does jps get information about all the local java processes? Does it connect to some local server process ... .com/a/55669949/156458. 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 program in a specific path is running

I am trying to check if a process is running with the code below: SERVICE="./yowsup/yowsup-cli" RESULT=`ps ... and just check for the 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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705 views

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linux - Android studio 2.1.2 gradle aapt Syntax error: Unterminated quoted string

I am trying to run Android Studio 2.1.2 on 32bit linux Mint 17.3. Android studio is freshly installed. When I ... other idea how 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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603 views

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linux - How can I execute parallel "for" loops in Bash?

I have been trying to parallelize the following script, specifically the for loop. How can I do that? #!/bin/bash ... -S yum update -y' done See Question&Answers more detail:os...

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

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398 views

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linux - Component based web project directory layout with git and symlinks

I am planning my directory structure for a linux/apache/php web project like this: Only www.example.com/ ... the comment function for 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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477 views

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linux - sed help: matching and replacing a literal " " (not the newline)

i have a file which contains several instances of . i would like to replace them with actual newlines, but sed ... the 's as real newlines? 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 - surround all array elements or arguments with quotes

I want to write a function in bash that forwards arguments to cp command. For example: for the input < ... and therefore the copy fails. See Question&Answers more detail:os...

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

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542 views

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linux - Change Timezone in Tomcat

How can I change the timezone in Tomcat? The timezone used by one of the webapps (Solr) is not right ( ... 's timezone will help. 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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489 views

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linux - Boost static linking

I am using the Boost library in Linux, GCC. After installing and building the Boost, I found that ... projects or Boost configuration 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 - Determining when NASM can infer the size of the mov operation

Something has got me confused in x86 assembly for a while, it's how/when can NASM infer the size of the ... would do this: mov ax, 12345 See Question&Answers more detail:os...

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

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