I’m tyring to count all the files from several ls -l statements for certain file types separated by the double amperand symbol like so: The technique I’ve seen for a single file type or all files will simply count all the end of line characters it finds using an egrep command: egrep -c ‘^-&#…
Tag: linux
Environment variables not loaded when executing command via `ssh` on remote machine
I want to write a script that executes several commands on a remote server, which includes executing some applications. The .bashrc file on the remote machine defines the PATH variable so that these applications are under it. But when I tried to use ssh <host> <command> , it seems that .bashrc was…
print specific field from specific line of csv file linux
I am trying to extract a specific field in a specific line of a CSV file. I’m able to do it according to the number row but sometimes the row number of the file will change so this is not that flexible. I wanted to try and do it to extract a specific name before the field I’m interested in.
Combine multiple files csv into one using awk
I want to combine two .csv files based on the unique id that exists in both files. First file consist of 17 columns and the second one in 2 columns where in both files the first column is the same unique id. In the to be created file 3 i would like 18 columns. I have been trying paste paste
How to unset all environment variables at once?
I am trying to unset environment variables in my code in teardown block. Is there a command to unset all variables at once? For example i am setting the following environment variables i am using unset command to unset the variables is there a command to unset all at once something like, unset all Answer You …
Python: Run command for another software in terminal
I am using a software that my lab has developed, lets call it cool_software. When I type cool_software on terminal, basically I get a new prompt cool_software > and I can imput commands to this software from the terminal. Now I would like to automate this in Python, however I am not sure how to pass the co…
Dockerfile – can’t unzip files using a shell script
I’m facing an issue unziping files that have been copied on a docker image. I tried using the RUN unzip /file.zip and other techniques that I came across but nothing seems to work. So then I tried adding the unziping action into the a shell script that I use as entrypoint for my docker image. Here is th…
Backslash inside an alias not being stored as part of its definition
I’ve got a screen sessions named BedrockServer. I’ve entered the alias like this: But when I type alias, it lists it as and the alias doesn’t work. I’ve tried messing around with the quotes and using backslashes before the quotes and before the dollar sign, but nothing fixes it. Any id…
C++: How to cross-compile from Windows to Linux?
I have a C++ module on windows which I want to compile such that I get a dynamic library for linux *.so. Does a cross-compiler exist that can help me out? Answer Several comments mentioned using Windows Subsystem for Linux. I would personally recommend this as it is far easier than trying to use a cross-compi…
Filter followed tail to file using grep and redirect
I want to get the output of tail -f /var/log/apache2/error.log | grep “trace1” into a file. But tail -f /var/log/apache2/error.log | grep “trace1” > output.txt does not work, while the first command gives an output in my terminal window as expected. I guess it has to do with the fol…