Why is a variable visible in a subshell?
The Learning Bash Book mentions that a subshell will inherit only environment variables and file descriptors, etc., and that it will not inherit variables that are not exported:
shell
How to move and overwrite subdirectories (and files) to parent directory?
I have a ton of files and dirs in a subdirectory I want to move to the parent directory. There are already some files and dirs in the target directory which need to be overwritten. Files that are only present in the target should be left untouched. Can I force mvto do that? It (mv * ..) complains
How to quickly store and access often used commands?
I have a lot of commands I routinely need to execute, often with the slightest variation.
What is the difference between “cat file | ./binary” and “./binary < file"?
I have a binary (that I can’t modify) and I can do:
How to use a variable as part of an array name
I have two arrays:
find searching in parent directories instead of subdirectories
I’m nested deep in a file tree, and I’d like to find which parent directory contains a file.
How does a Segmentation Fault work under-the-hood?
I can’t seem to find any information on this aside from “the CPU’s MMU sends a signal” and “the kernel directs it to the offending program, terminating it”.
Find files that contain multiple keywords anywhere in the file
I’m looking for a way to list all files in a directory that contain the full set of keywords I’m seeking, anywhere in the file.
What exactly is scrollback and scrollback buffer?
What are “scrollback” and “scrollback buffer” in programs like bash and screen, and how do they relate to the tty, the programs being run, and stdin/ stdout/ stderr?
How are parentheses interpreted at the command line?
While reading up on how to set up grub, I came across an article claiming that I need to use one of the following two syntaxes,