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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
- shell - Bash regex =~ operator - Stack Overflow
What is the operator =~ called? I'm not sure it has a name The bash documentation just calls it the =~ operator Is it only used to compare the right side against the left side? The right side is considered an extended regular expression If the left side matches, the operator returns 0, and 1 otherwise Why are double square brackets required when running a test? Because =~ is an operator of
- 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
- 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
- bash - What does lt; lt; lt; mean? - Unix Linux Stack Exchange
Take a look at the Bash man page This notation is part of what's called a here documents here strings It allows you the ability to generate multi-line data input as one continuous string The variation you're asking about is called a here string excerpt from Bash man page Here Strings A variant of here documents, the format is: <<<word The word is expanded and supplied to the command on
- 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 set -e mean in a Bash script? - Stack Overflow
By default, Bash does not do this This default behavior is exactly what you want if you are using Bash on the command line you don't want a typo to log you out! But in a script, you really want the opposite If one line in a script fails, but the last line succeeds, the whole script has a successful exit code That makes it very easy to miss
- 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?
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