Difference between $ {} and $ () in a shell script - Super User
The above (along with many more forms of ${parameter…something_else} constructs) are discussed at greater length in the shell’s man page, bash(1). A Note on Quotes. Note that you should always quote shell variables unless you have a good reason not to, and you’re sure you know what you’re doing. By contrast, while braces can be ...
Is there any functional-like unix shell? - Super User
Scheme Shell, scsh, is really good. As Keith Thompson notes, it's not useful as an interactive shell (though Commander S looks like an interesting experiment). Instead, it's an excellent programming language for contexts where having all the POSIX bindings is useful -- that includes cases where you want to call other unix applications.
shell - What does "2>&1" do in command line? - Super User
2014年7月10日 · The & at the end is how you tell the shell to run the command as a job in the background. This causes the prompt to return immediately while the command is run asynchronously behind the scenes. To see the current jobs type jobs in your terminal. Note this is different from the processes running in your system. To see those type top in the terminal.
What is the difference between shell, console, and terminal?
The shell is the program which actually processes commands and returns output. Most shells also manage foreground and background processes, command history and command line editing. These features (and many more) are standard in bash, the most common shell in modern linux systems. A terminal refers to a wrapper program which runs a shell ...
Command prompt in Windows and Linux - Super User
2011年10月22日 · With Linux, "shell script" languages are called that, or by the name of the shell, most commonly "bash". There is quite a variety of terminology used for the command shell language on Windows, due in part to name changes in the platforms. Some options that are used: CMD or Command Shell (like the language of the Bash interpreter is called Bash)
How can I run a shell script in Windows? - Super User
2012年1月2日 · Scripts with a .sh suffix are generally Bourne shell scripts (or bash, or ksh, or zsh -- all shells derived from the Bourne shell). (Note that on Unix-like systems, including MacOS, the .sh suffix isn't necessary; the OS looks at the #!/bin/sh line at the top of the script to determine how to execute it.) Windows doesn't provide a Bourne-like ...
What do you call the language you use in CMD nowadays?
2023年3月16日 · Microsoft documentation seems to call cmd.exe language Command Shell or Windows Commands, as opposed to PowerShell or Windows Script (wscript/cscript) languages. In the older (MS-DOS) documentation, the language is referred to as Batch Commands.
What is the difference between "Shell" and "Terminal"?
2010年11月12日 · The shell is a program which accepts your commands (ls, cd, etc) and processes them by running built-in functions (like cd) or calling external programs (like ls or gcc). The terminal is the thing (almost always a program these days, but often a piece of hardware back in the bronze age) that manages your keystrokes and shows text to you---both ...
When to use Bash and when to use Perl/Python/Ruby?
Perl tries to fill the gap between low-level programming (such as in C or C++ or assembly) and high-level programming (such as “shell” programming [e.g., bash]). Low-level programming is usually hard to write and ugly, but fast and unlimited; it’s hard to beat the speed of a well-written low-level program on a given machine.
shell script - How to execute .sh file on Windows? - Super User
2010年3月30日 · The syntax of a unix shell script, and a windows batch file arn't too similar. cygwin, or a load of messing around with unxutils might make something that would work in both, but unless you're ABSOLUTELY sure the environment is always the same, it …