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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," ... ,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," ... ,StudentFirstName 100,Logan 101,Matthew Thank in advance...

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

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2.1k views

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bash - Get nginx version synchronously?

Something weird is going on when I try to get the nginx version. When I run this command: echo "[nginx]" $ ... with the nginx program or what. See Question&Answers more detail:os...

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

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bash - Delete nodes in xml if they contain certain text using sed

I have an xml that looks like following. <rootNode> <appender name="SERVER_FILE" class="org.apache.log4j. ... > Can someone help me? See Question&Answers more detail:os...

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

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bash arithmetic expressions with variables

I am having troubles with the arithmetic expressions in a bash file (a unix file .sh). I have the variable " ... get it to work with variables. See Question&Answers more detail:os...

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

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2.0k views

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bash - assign a value to a variable in a loop

There are 2 pieces of code here, and the value in $1 is the name of a file which contains 3 lines of text. ... echo "$count2 line(s) in all." See Question&Answers more detail:os...

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

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2.1k views

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bash - How can I check if a given directory is accessible?

I am currently writing a script that will list all specific files in a directory. What I need the script to do is ... an error if it isn't. See Question&Answers more detail:os...

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

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2.3k views

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bash - `M-x term' with Emacs on MS Windows: error Spawning child process: invalid argument

whenever I try to launch M-x term from my Windows distribution of GNU Emacs, I get the error: apply: Spawning ... more features... Any help? See Question&Answers more detail:os...

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

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bash - Print elapsed time in secs with three trailing digits

For a framework I'm writing I would like to measure how much a piece of (bash) code takes to execute and ... to see how I implemented this. See Question&Answers more detail:os...

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

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2.2k views

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bash - Passing JSON arguments (not simple strings) to jq

How do I pass in bash variables into a jq --arg parameter? All I can get to work is this: FINAL_JSON ... error, unexpected $end {1 compile error See Question&Answers more detail:os...

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

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2.0k views

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bash - Delete row which has more than X columns in a csv

I need to delete all the rows in a csv file which have more than a certain number of columns. This happens because ... can learn how to use 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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1.9k views

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bash - How to read a line from each of several files in each iteration of a single loop?

I need to read from multiple file in one loop. I have one file with X coords, one file with Y coords ... and $CHAR while speeding things up? See Question&Answers more detail:os...

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

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2.2k views

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bash - How to remove a child block from YML in shell script?

I'm trying to compare two yml files and removing a block based on some conditions using shell script. ... greatly helpful and much 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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2.1k views

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bash - How to compile an Android app with aapt2 without using any build tools?

I'm trying to compile an Android application I just created in Kotlin on Android Studio, without using Gradle ... template/blob/master/build.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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2.0k views

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bash - How to search & replace arbitrary literal strings in sed and awk (and perl)

Say we have some arbitrary literals in a file that we need to replace with some other literal. Normally, we'd ... in case it comes in useful. See Question&Answers more detail:os...

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

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1.9k views

1 answer

bash - How to access the metadata of a docker container from a script running inside the container?

I am trying to understand whether it is possible to read the metadata (Labels, in particular) properties of a container ... shell? If so, how? See Question&Answers more detail:os...

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

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2.3k views

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bash - Getting error ": command not found" when trying to run shell script

I have a script that I'm trying to run but I just get the error ": command not found" whenever I try ... script. Any help is much 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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2.2k views

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bash - Converting second pattern to millisecond in awk

I have file which is having pattern 's' , I need to convert into 'ms' by multiplying by 1000. I am unable ... to 'ms' if second pattern comes . See Question&Answers more detail:os...

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

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2.5k views

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bash - How to obfuscate a shell script?

I am using Ubuntu 10.04. i have created a shell script. After writing the script, the code can be ... make the script unreadable in Gedit. See Question&Answers more detail:os...

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

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2.1k views

1 answer

bash - remove block of text between two lines based on content

I need to remove/filter a very large log file i managed to bring the log-file into blocks of text starting ... it get updates by the minute See Question&Answers more detail:os...

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

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2.3k views

1 answer

bash - How replace variable names in an xml-file?

The java build tool ant provides filter to replace variables by their values Example: A file with properties: db. ... bash and plain unix tools? See Question&Answers more detail:os...

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

0 votes

2.2k views

1 answer

bash - 2 while read loops?

So the object of the script I'm making is to compare files from two while read lists that have file path names ... ... Is this even possible? See Question&Answers more detail:os...

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

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2.1k views

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bash - Prefixing variable assignment doesn't work with echo

As far as I know, if you prefix a bash command with variable assignment the variable will take effect immediately. And ... why it doesn't work? See Question&Answers more detail:os...

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

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2.5k views

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bash - what is EOF in cygwin in windows 10

I used to run cygwin on win8.1, and while giving inputs to a program CTRL-Z used to denote EOF. Today I ... in java on cygwin on windows-10 See Question&Answers more detail:os...

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

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2.0k views

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bash - kafka and JMX-exporter

I am unable to use JMX exporter to expose kafka metrics. Can you look at my steps and correct me where needed ... you help me with above issues? See Question&Answers more detail:os...

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

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2.1k views

1 answer

bash - What is a hyphen beside a shell variable

I saw in some of our scripts that there is a hyphen attached to a shell variable. For example: if [ ... find any documentation online for this. See Question&Answers more detail:os...

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

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2.1k views

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bash - Why does find . -not -name ".*" not exclude hidden files?

I want to ignore all hidden files, but especially .git and .svn ones when searching (and later replacing) files, not I ... /g' {} ; unset expr } See Question&Answers more detail:os...

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

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2.6k views

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bash - Loop inside "heredoc" in shell scripting

I need to execute series of commands inside an interactive program/utility with parameterized values. Is there a ... utilityCommand $i done EOF See Question&Answers more detail:os...

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

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