- #What is the redo command in windows how to#
- #What is the redo command in windows software#
- #What is the redo command in windows free#
The Bash shell surfed that wave of success, too.īash incorporates and improves on the feature set of the Bourne shell, but it also took inspiration from other shells, such as the C shell ( csh) and the KornShell ( ksh). Linux flourished to the point that it now underpins an astonishing amount of the modern world. The GNU operating system needed a kernel, and the Linux kernel needed everything else that makes up a Unix clone.īecause Bash is the standard GNU shell, it became the standard shell on all GNU/Linux distributions. The pairing of the GNU utilities with the Linux kernel was mutually beneficial. Linus Torvalds, the creator of the Linux kernel, has said that the first two programs that he ran on his new kernel in 1991 were Bash and gcc, GNU’s compiler. Nowadays, he is still the maintainer of the Bash project.
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He eventually became a co-maintainer of the Bash shell. This was partly in homage to Stephen Bourne and partly wordplay for the sake of it. After its release in 1989, Chet Ramey contributed some bug fixes to Bash. It was dubbed the Bourne Again Shell, or Bash.
#What is the redo command in windows free#
In 1984, when the GNU project announced its intention to make a free Unix clone-written from the ground up and with a new, permissive licensing-the team needed a shell. When a volunteer who had been working on a shell for the GNU project repeatedly failed to deliver anything at all, Brian Fox was tasked with writing a clone of the Bourne shell.
#What is the redo command in windows how to#
RELATED: How to Use "Here Documents" in Bash on Linux The Birth of Bash The Bourne shell raised the bar and became the new standard. The Bourne shell even supported “here documents,” an elegant way to automate sending data into commands. The shell now contained some built-in commands, meaning that it didn’t need to pass everything out to external utilities, making it more efficient. Pipes and redirection were added, along with improvements in handling loops. It supported foreground and background task execution and elementary job control. The Bourne shell was an interactive shell and a scripting language. Backward compatibility was important, but new features were included that provided much functionality that we still use today. It was even started using the same command as the Thompson shell, sh, to maintain backward compatibility with existing scripts. The Bourne shell, written by Stephen Bourne, was an upgraded replacement for the Thompson shell. RELATED: What Is Unix, and Why Does It Matter? The Bourne Shell It was replaced by the Bourne shell in Version 7 of Unix in 1979. The Thompson shell was used as the default Unix shell up to and including Unix Version 6. It was written by Ken Thompson, who is possibly the most key member of the original Unix founding fathers at Bell Labs. The first Unix shell was the Thompson shell, called sh. Scripts deliver efficiency, repeatability, and convenience. All the commands in the script are executed for you each time you run the script.
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Shells also allow you to parcel up a collection of commands into a text file called a script. The command line is provided by the shell, and the terminal window lets you access the shell. In order to do anything useful, you must be able to type instructions at a command line.
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It gives you a connection to the computer.
#What is the redo command in windows software#
A terminal window is a software representation of a physical teletype terminal. People often use the phrases “terminal windows,” “command line,” and “shell” interchangeably, but they’re three distinct things.