variable, quoting the variable expansion forces the entire pattern to be matched as a string. Substrings matched by parenthesized subexpressions within the regular expression are saved in the array variable BASH_REMATCH. The element of BASH_REMATCH with index 0 is the portion of the string matchi...
Bash also interprets a number of multi-character options. These options must appear on the command line before the single-character options to be recognized. 译:bash也支持大量的多字符选项,但是前提是这些多字符选择要出现在单字符选项前面--debugger Arrangeforthe debugger profile to be executed before ...
In Bash, you can generate a random number using the built-in variable$RANDOM. It will return a random integer between 0 and 32767 which you can attach to a variable or print it to terminal with the syntaxecho $RANDOM. This variable provides a simple and efficient way to create random nu...
Bash also interprets a number of multi-character options. These options must appear on the command line before the single-character options to be recognized. 译:bash也支持大量的多字符选项,但是前提是这些多字符选择要出现在单字符选项前面 --debugger Arrange for the debugger profile to be executed be...
Any arguments after the -- are treated as filenames and arguments. An argument of - is equivalent to --. Bash also interprets a number of multi-character options. These options must appear on the command line before the single-character options to be recognized. --debugger Arrange for the...
You can set various options to tweak how the bash should behave and using the$-variable, you can print the currently enabled options: echo $- Seems confusing. Isn't it? Let me interpret it for you. Here, h(hashall): Using this option, bash is instructed to keep track of every comman...
Scroll horizontally right N characters, default half the screen width (see the -# option). If a number N is specified, it becomes the default for future RIGHTARROW and LEFTARROW commands. While the text is scrolled, it acts as though the -S option (chop lines) were ...
IGNOREEOF Controls the action of the shell on receipt of an EOF character as the sole input. If set, the value is the number of consecutive EOF characters typed as the first characters on an input line before bash exits. If the variable exists but does not have a numeric value, or has...
Used to tell the operating system the path it should use to interpret the file. bash file.sh Used to execute the script in the terminal. ./file.sh Used to execute the script if it is executable. # Used to make comments in the script. && logical AND operator. | | logical OR operator...
In this example, even though the string “Hello World” contains a space, it’s treated as a single element in the array because we’ve used quotes around it. Without the quotes, Bash would interpret it as two separate elements.