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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 - 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:
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
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
Meaning of $? (dollar question mark) in shell scripts What does echo $? mean in shell programming?true echo $? # echoes 0 false echo $? # echoes 1 From the manual: (acessible by calling man bash in your shell) ? Expands to the exit status of the most recently executed foreground pipeline By convention an exit status of 0 means success, and non-zero return status means failure Learn more about exit statuses on wikipedia There are other special
Bash test: what does =~ do? - Unix Linux Stack Exchange I realize you said “read the bash man pages” but at first, I thought you meant read the man pages within bash At any rate, man bash returns a huge file, which is 4139 lines (72 pages) long