bash

问题 I'm trying to use a command on everyfile .log in a folder but I can't understand how to change the output file for every file in the folder. #!/bin/bash N="0" for i in "*.log" do echo "Processing $f file..." cat $i | grep "test" | awk '/show/ {a = $1} !/show/{print a,$6}' > "log$N.txt" done How can i increment the counter for log$n.txt? 回答1: It's bad practice to write shell loops just to process text (see https://unix.stackexchange.com/questions/169716/why-is-using-a-shell-loop-to-process

问题 There seems to be a difference between how Docker runs commands in a Dockerfile versus running commands manually after starting a container. This seems to be due to the kind of shells you can start, a (I assume) non-interactive shell with a Dockerfile vs an interactive one when running something like docker run -it <some-img-id> . How can I debug running commands in a Docker container so that it runs exactly like the commands are run from a Dockerfile? Would just adding /bin/bash --noprofile

问题 I am trying to run a bash script through the user_data argument of the spot_fleet_request method. The script executes all the installations and connects to the filesystem, but when it runs the python file I need to run it gives me the following error: Traceback (most recent call last): File "/home/ec2-user/efs/dir/create_lvl_output.py", line 8, in <module> from modeling import generators ImportError: No module named modeling Where modeling is a folder with a script I am importing "modeling

问题 I've seen someone running cat|bash before pasting commands from the clipboard into a terminal. bash executes commands in bash I do not know why do we need cat here and |(pipe) . What useful effects does this practice have? 回答1: It was my colleague who executed a bunch of command in the terminal, [...] he did cat|bash before pasting those set of commands He likely this to stop Bash from interpreting anything in the commands as editing input, to override any special keybindings and aliases he's

问题 in jenkins-pipeline, I'm trying to use SED to append the following line to the end of a file. sh "sed -i '\$ s/\$/ public_file=\\/var\\/lib\\/jenkins\\/workspace\\/test-project\\ ansible_ssh_common_args='-o StrictHostKeyChecking=no' /' file.txt" but I can't figure out how to escape the below line in my Jenkins file to make it work. ansible_ssh_common_args='-o StrictHostKeyChecking=no' I've already tried the following, which works in katacoda playground, but not in jenkins pipeline. '"'"'-o

问题 I'm trying but failing to write a regex to grep for lines that do not begin with "//" (i.e. C++-style comments). I'm aware of the "grep -v" option, but I am trying to learn how to pull this off with regex alone. I've searched and found various answers on grepping for lines that don't begin with a character, and even one on how to grep for lines that don't begin with a string, but I'm unable to adapt those answers to my case, and I don't understand what my error is. > cat bar.txt hello //world

问题 in jenkins-pipeline, I'm trying to use SED to append the following line to the end of a file. sh "sed -i '\$ s/\$/ public_file=\\/var\\/lib\\/jenkins\\/workspace\\/test-project\\ ansible_ssh_common_args='-o StrictHostKeyChecking=no' /' file.txt" but I can't figure out how to escape the below line in my Jenkins file to make it work. ansible_ssh_common_args='-o StrictHostKeyChecking=no' I've already tried the following, which works in katacoda playground, but not in jenkins pipeline. '"'"'-o

问题 A Redditor had written me a great script that allowed me to move all the files in a series of folders into a new subdirectory in all those folders called New. However, I also have pre-existing folders (namely just 1 called "Journals") that have had their files moved into a subdirectory called New, as well. How would I modify the following script (on Windows) to not touch any folders within the folders, or perhaps not touch any folder called Journals? For example, the current directory looks

问题 I'm trying but failing to write a regex to grep for lines that do not begin with "//" (i.e. C++-style comments). I'm aware of the "grep -v" option, but I am trying to learn how to pull this off with regex alone. I've searched and found various answers on grepping for lines that don't begin with a character, and even one on how to grep for lines that don't begin with a string, but I'm unable to adapt those answers to my case, and I don't understand what my error is. > cat bar.txt hello //world

问题 I have two C++ programs: one that prints a message to stdout, and the other that listens to stdin and prints all content from the stream. They are named out and in respectively. out.cpp: #include <iostream> using namespace std; int main() { cout<<"HELLO"; usleep(1000000); cout<<"HELLO"; } in.cpp: #include <iostream> using namespace std; int main() { string input; while(cin>>input) { cout<<input; } } As it currently stands, piping the data from out to in waits for two seconds, then prints