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- bash - What is the purpose of in a shell command? - Stack Overflow
As far as I know, using amp; after the command is for running it in the background Example of amp; usage: tar -czf file tar gz dirname amp; But how about amp; amp;? (example)
- bash - What are the special dollar sign shell variables . . . - Stack . . .
In Bash, there appear to be several variables which hold special, consistently-meaning values For instance, myprogram amp;; echo $! will return the PID of the process which backgrounded myprog
- 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" are pattern matching, other three are string equality:
- 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 command Look at your usr bin, there is most likely a program called "[" there! Strictly speaking, [ ] is not part of bash syntax
- linux - What does $@ mean in a shell script? - Stack Overflow
(View Special parameters - Bash Manual) For instance, if you call someScript sh foo bar then $@ will be equal to foo bar If you do: someScript sh foo bar and then inside someScript sh reference: umbrella_corp_options "$@"
- 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 thus only the left-hand side of the or runs, since that succeeds the right-hand side doesn't need to run
- An and operator for an if statement in Bash - Stack Overflow
Modern shells such as Bash and Zsh have inherited this construct from Ksh, but it is not part of the POSIX specification If you're in an environment where you have to be strictly POSIX compliant, stay away from it; otherwise, it's basically down to personal preference Note that the arithmetic substitution expression $((
- 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 probably also has a bin [ and a bin test and if you man test you can see the manuals for those
- Bash test: what does =~ do? - Unix Linux Stack Exchange
help [[returns useful information—since [[an internal bash command—but does not say whether =~ uses basic or extended regex syntax ⋯ The text you quoted is from the bash man page I realize you said “read the bash man pages” but at first, I thought you meant read the man pages within bash
- Whats the difference between lt; lt;, lt; lt; lt; and lt; lt; in bash?
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 observed via tracing system calls with strace command Replace bash with sh to see how bin sh performs this redirection $ strace -e open,dup2,pipe,write -f bash -c 'cat <<EOF > test
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