- 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 - What is the purpose of in a shell command? - Stack Overflow
Furthermore, you also have which is the logical or, and also which is just a separator which doesn't care what happend to the command before
- Whats the difference between lt; lt;, lt; lt; lt; and lt; lt; in bash?
What's the difference between <<, <<< and < < in bash? Here document << is known as here-document structure You let the program know what will be the ending text, and whenever that delimiter is seen, the program will read all the stuff you've given to the program as input and perform a task upon it Here's what I mean: $ wc << EOF > one two three > four five > EOF 2 5 24 In this example we
- How do AND and OR operators work in Bash? - Stack Overflow
How do AND and OR operators work in Bash? Asked 13 years, 1 month ago Modified 2 years, 10 months ago Viewed 22k times
- 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:
- What does $# mean in bash? - Ask Ubuntu
Furthermore, when you use bash -c, behavior is different than if you run an executable shell script, because in the latter case the argument with index 0 is the shell command used to invoke it
- shell - Bash regex =~ operator - Stack Overflow
The =~ operator is a regular expression match operator This operator is inspired by Perl's use of the same operator for regular expression matching 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
- bash - Difference between gt; gt; and - Unix Linux Stack Exchange
In general, in bash and other shells, you escape special characters using \ So, when you use echo foo >\> what you are saying is "redirect to a file called > ", but that is because you are escaping the second > It is equivalent to using echo foo > \> which is the same as echo foo > '>' So, yes, as Sirex said, that is likely a typo in your book
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