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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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554 views

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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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638 views

1 answer

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]" $(nginx -v) It prints nginx version: ... issue or something funny 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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565 views

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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.RollingFileAppender"> <param name="File" value="C:/ ... </logger> </rootNode> 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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708 views

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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 "total", which consists of a few numbers ... but I couldn't 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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630 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. Now, I have a problem. In the first piece ... $count2 + 1 ] done echo "$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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619 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 to verify that the directory is accessible. I ... not, and to return 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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806 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 child process: invalid argument after accepting ... use Term to get 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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684 views

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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 then print the elapsed time in ... total_elapsed_time variable here 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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767 views

1 answer

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= #some JSON PAYLOAD=$(echo $FINAL_JSON | ... : error: syntax 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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625 views

1 answer

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 sometimes the code, which generates the csv ... one, so that I 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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593 views

1 answer

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 one file with chars on those coords. For ... values in $Y, $X 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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775 views

1 answer

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. I'm using this YML parser, https://gist. ... on this would be 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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702 views

1 answer

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 or any other build tools. My ... /authmane512/android-project-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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644 views

1 answer

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 just reach for sed(1) or awk(1) and code ... I'll leave this here 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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613 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 using a bash script. For instance, if ... label inside the bash 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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664 views

1 answer

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 to run it. Here's what I've tried to ... am unable to run the 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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670 views

1 answer

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 do it. Please help me. file.txt First ... above pattern 's' 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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999 views

1 answer

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 edited when right clicking the file and selecting ... to know how to 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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610 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 with a line containing <-- or --> ending ... to the final version so 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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833 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.user.name=user db.driver=com.informix.jdbc ... be achieved with 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)

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797 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 in them... while read compareFile <&3 ... two while read loops... 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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675 views

1 answer

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 it will only have effect within that ... what I expected. So 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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981 views

1 answer

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 installed cygwin on win10, and ran "a ... question reading till EOF 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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666 views

1 answer

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.? I am following steps here to ... enabled correctly. Can 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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707 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 [ -z ${X-} ] What does this hyphen symbol ... do here. I cannot 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)

0 votes

762 views

1 answer

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 have found that the most basic way to exclude ... -i 's/$1/$2/g' {} ; unset expr } See Question&Answers more detail:os...

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

0 votes

974 views

1 answer

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 way to loop inside heredoc ? Like below .. ... i in $list ; do 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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