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- 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:
- 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
- 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
- How to compare strings in Bash - Stack Overflow
How do I compare a variable to a string (and do something if they match)?
- shell - What does -ne mean in bash? - Stack Overflow
It doesn't mean anything "in bash" [ runs a command called test -ne is an argument to the test command, not to bash, and you can find its documentation in man test
- Whats the meaning of the parameter -e for bash shell command line?
123 I have as bash shell script with header #! bin bash -e When I run the script, it will be interrupted after the grep command runs, but when I remove the parameter -e, then the script can be run normally What is the meaning of parameter -e?
- syntax - Ternary operator (?:) in Bash - Stack Overflow
@dutCh's answer shows that bash does have something similar to the "ternary operator" however in bash this is called the "conditional operator" expr?expr:expr (see man bash goto section "Arithmetic Evaluation") Keep in mind the bash "conditional operator" is tricky and has some gotchas
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