shell - Bash regex =~ operator - Stack Overflow
The [[ ]] is treated specially by bash; consider that an augmented version of [ ] construct: [ ] is actually a shell built-in command, which, can actually be implemented as an external …
bash - What is the purpose of "&&" in a shell command? - Stack …
Oct 27, 2021 · As far as I know, using & after the command is for running it in the background. Example of & usage: tar -czf file.tar.gz dirname & But how about …
bash - What are the special dollar sign shell variables ... - Stack ...
Sep 14, 2012 · In Bash, there appear to be several variables which hold special, consistently-meaning values. For instance, ./myprogram &; echo $! will return the PID of the process …
bash - Shell equality operators (=, ==, -eq) - Stack Overflow
If not quoted, it is a pattern match! (From the Bash man page: "Any part of the pattern may be quoted to force it to be matched as a string."). Here in Bash, the two statements yielding "yes" …
linux - What does $@ mean in a shell script? - Stack Overflow
Apr 3, 2012 · (View Special parameters - Bash Manual) For instance, if you call ./someScript.sh foo bar then $@ will be equal to foo bar. If you do:./someScript.sh foo bar and then inside …
How do AND and OR operators work in Bash? - Stack Overflow
In bash, && and || have equal precendence and associate to the left. See Section 3.2.3 in the manual for details. So, your example is parsed as $ (echo this || echo that) && echo other And …
linux - Difference between ${} and $() in Bash - Stack Overflow
your understanding is right. For detailed info on {} see bash ref - parameter expansion 'for' and 'while' have different syntax and offer different styles of programmer control for an iteration. …
What's the difference between <<, <<< and < < in bash?
Sep 27, 2015 · In bash these are implemented via temp files, usually in the form /tmp/sh-thd.<random string>, while in dash they are implemented as anonymous pipes. This can be …
What do the -n and -a options do in a bash if statement?
In bash the test command will be a built-in command; try type [to learn its type. For built-in commands help will show usage, so also run help [ to see documentation. Your system …
bash - Precedence of the shell logical operators &&, || - Unix
This is not the case with Bash, however, in which both operators have the same precedence, which is why Bash parses your expression using the left-associativity rule. Thanks to Kevin's …