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Extract multiple columns with no duplicate data with bash on linux

Hi all, i have a csv file like this: ecStudentID,StudentNetworkUsername,StudentName,StudentFirstName 100,ASTDTBJ001,"Andrew,Logan Connor",Logan 100, ... . Example: ecStudentID,StudentFirstName 100,Logan 101,Matthew Thank in advance...

asked May 1, 2022 in Technique[技术] by Tan (100 points)

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Extract multiple columns with no duplicate data with bash on linux

Hi all, i have a csv file like this: ecStudentID,StudentNetworkUsername,StudentName,StudentFirstName 100,ASTDTBJ001,"Andrew,Logan Connor",Logan 100, ... . Example: ecStudentID,StudentFirstName 100,Logan 101,Matthew Thank in advance...

asked May 1, 2022 in Technique[技术] by Tan (100 points)

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593 views

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linux - Delete only fully formed line ranges from a text file while ignoring those that only have a start delimiter

I what to delete lines between START and END keywords as described below: START text1 text2 text3 START text4 END text5 text6 START test7 START test8 ... : START text1 text2 text3 text5 text6 START text7 See Question&Answers more detail:os...

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

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711 views

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linux - sed returns "sed: command garbled"

I have this data in file.txt: 1234-abca-dgdsf-kds-2;abc dfsfds 2 123-abcdegfs-sdsd;dsfdsf dfd f 12523-cvjbsvndv-dvd-dvdv;dsfdsfpage I want ... following error: sed command garbled Why is this happening? See Question&Answers more detail:os...

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

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631 views

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linux - Changing the directory of the shell through a C++ program

I'm trying to write a simple C++ program to execute Linux commands. I'm stuck at changing the directories (commands like chdir and cd don't work). This ... Directory is '; pwd"); system("chdir Desktop"); See Question&Answers more detail:os...

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

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508 views

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linux - Using a glob expression passed as a bash script argument

TL;DR: Why isn't invoking ./myscript foo* when myscript has var=$1 the same as invoking ./myscript with var=foo* hardcoded? Longer form I've come ... to do with the wildcard expansion in the for loop. See Question&Answers more detail:os...

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

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530 views

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linux - Replace bash variables in template file

I am attempting to use Bash in order to run a form of an install process. During this process, a configuration file is copied and certain values ... just Bash and commands available on most Linux systems? See Question&Answers more detail:os...

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

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661 views

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linux - Makefile with multiple targets

Hopefully this is a very simple question. I have a makefile pattern rule that looks like this: %.so : %.f %.pyf f2py -c -L${LAPACK_DIR} ${GRASPLIBS} -m ... that need to be built so I can just run 'make'. See Question&Answers more detail:os...

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

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631 views

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linux - sed: insert a line in a certain position

i was just looking around but i didn't find anything that works for me. I would like to insert a new line (basically an html table row) on top of the ... Row:1 Cell:4</td> just below the HEADERS? Thanks! See Question&Answers more detail:os...

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

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581 views

1 answer

linux - History command works in a terminal, but doesn't when written as a bash script

I have a simple one-liner that works perfectly in the terminal: history | sort -k2 | uniq -c --skip-fields=1 | sort -r -g | head ... special about the history command that prevents us from executing 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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793 views

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linux - grep with continuous pipe does not work

(maybe it is the "tcpflow" problem) I write a script to monitoring http traffic, and I install tcpflow, then grep it works (and ... github.com/zhengkai/config/blob/master/script/monitor_outgoing_http.sh 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

1 answer

linux - How to correctly include the support library in non-Eclipse Android application

I am thinking how to get Android' s support library to include and compile outside Eclipse. I am using Linux as my build environment and I am not using any ... can I do it using only Ant and Android SDK? See Question&Answers more detail:os...

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

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520 views

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linux - Compiling C++ code makes the system hang

When I try to compile this file by issuing the command, "g++ qr.cpp -o qr" The system hangs. I haven't seen this kind of an error anywhere else. ... gcc version 4.6.1 (Ubuntu/Linaro 4.6.1-9ubuntu3) See Question&Answers more detail:os...

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

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546 views

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linux - ELF Header or installation issue with bcrypt in Docker container

Kind of a longshot, but has anyone had any problems using bcrypt in a linux container (specifically docker) and know of an automated workaround? I have ... a good alternative to bcrypt with a Node stack? See Question&Answers more detail:os...

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

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607 views

1 answer

linux - Write-only mapping a O_WRONLY opened file supposed to work?

Is mmap() supposed to be able to create a write-only mapping of a O_WRONLY opened file? I am asking because following fails on a Linux 4.0.4 x86-64 ... I couldn't find anything obvious in Linux/mm/mmap.c) See Question&Answers more detail:os...

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

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572 views

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linux - Get lines of file1 which are not in file2

I have two long, but sorted files. How to get all lines of first file which are not in second file ? file1 0000_aaa_b 0001_bccc_b 0002_bcc <-- ... ... file2 0000_aaa_b 0001_bccc_b 0003_aaa_d 0006_xxx ... See Question&Answers more detail:os...

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

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581 views

1 answer

linux - Use sed with ignore case while adding text before some pattern

sed -i '/first/i This line to be added' In this case,how to ignore case while searching for pattern =first See Question&Answers more detail:os...

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

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555 views

1 answer

linux - How do I determine whether the filesystem is case-sensitive in .net?

Does .net have a way to determine whether the local filesystem is case-sensitive? See Question&Answers more detail:os...

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

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622 views

1 answer

linux - Assembler sysTime giving error on executing

i'm learning Assembler (Nasm, Linux, Ubuntu 16.4, x86_64) and getting Trouble using the sys_time call (mov eax, 13). section .bss time: resb 30; ... have to declare a Integer? or is my kernel broke? See Question&Answers more detail:os...

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

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583 views

1 answer

linux - netfilter-like kernel module to get source and destination address

I read this guide to write a kernel module to do simple network filtering. First, I have no idea of what below text this means, and what's the ... 's utilities(source file). Any help will be appreciated. See Question&Answers more detail:os...

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

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598 views

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linux - Why does order in which input libraries are specified matter?

I'm quite new to programming for Linux. You could say I'm a Windows guy. So, I was porting my project to Linux, and it almost made me insane: I'm ... 'm pretty sure it is not the case with MSVC linker... See Question&Answers more detail:os...

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

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619 views

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linux - Access Keystrokes in C

I am trying to access keystrokes in C. I can access alphanumeric keys. How can I access Control, Shift and Alt key? Plus I read somewhere that sometimes while ... when ' ' was pressed. GNU C. Ubuntu 11. See Question&Answers more detail:os...

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

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704 views

1 answer

linux - How to duplicate string in bash?

I have the following string in bash str="kallel" I want to create from str an str2. The str2 contains str duplicated till the length = 20. So the ... : str2="kallelkallelkallelka" How to do in in bash? See Question&Answers more detail:os...

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

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585 views

1 answer

linux - Prevent * to be expanded in the bash script

Linux bash script: #!/bin/bash function Print() { echo $1 } var="*" Print $var Execution results: [email protected]:~/tmp$ ./sample-script sample- ... complicated than *, for example: home/alex/mydir/*. See Question&Answers more detail:os...

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

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731 views

1 answer

linux - Cannot use wildcard in kernel module makefile

I am pretty familiar with Makefiles and kernel modules, but recently I got a problem in my Makefile that doesn't make any sense -- on using wildcards ... in the makefile. Any help will be appreciated. See Question&Answers more detail:os...

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

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710 views

1 answer

linux - Shell Script for multithreading a process

I am a Bioinformatician and recently stuck in a problem which requires some scripting to speed up my process. We have a software called PHASE and Command ... advantage of 4 cores and speed up my process. See Question&Answers more detail:os...

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

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760 views

1 answer

linux - Backing up (and restoring) a Plone instance

I have a Plone installation in my home directory under Linux. ~/Plone. This was made from a default distribution of Plone from its website. So Plone ... found this resource, but it's not specific enough. See Question&Answers more detail:os...

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

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742 views

1 answer

linux - Overwrite input file using awk

I have the following line of code: awk -F, '{printf "%09d,%d " ,$1,$2}' $newDir/$processNew and it does what I want it to, but instead ... overwrite the current input file which is $processNew ? Thanks. See Question&Answers more detail:os...

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

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