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What does Bash stand for in the GNU operating system?
Bash is the shell, or command language interpreter, for the GNU operating system. The name is an acronym for the ‘Bourne-Again SHell’, a pun on Stephen Bourne, the author of the direct ancestor of the current Unix shell sh, which appeared in the Seventh Edition Bell Labs Research version of Unix.
How does shopt check for errors in Bash?
The errors checked for are transposed characters, a missing character, and a character too many. If a correction is found, the corrected path is printed, and the command proceeds. This option is only used by interactive shells. If this is set, Bash checks that a command found in the hash table exists before trying to execute it.
What should the optname be for shopt in Bash?
Restricts the values of optname to be those defined for the -o option to the set builtin (see The Set Builtin ). If either -s or -u is used with no optname arguments, shopt shows only those options which are set or unset, respectively. Unless otherwise noted, the shopt options are disabled (off) by default.
How to set the shell options in Bash?
The shell-options can be set with the shopt builtin command . If set, a command name that is the name of a directory is executed as if it were the argument to the cd command. If set, Bash attempts to expand associative array options only once.
How to change the shell to bash in Linux?
The superuser (root) may change the login shell for any account using the following syntax: $ sudo chsh -s /bin/bash raj OR use the su command instead of sudo command:
Is the Bash shell compatible with the sh shell?
Bash is largely compatible with sh and incorporates useful features from the Korn shell ksh and the C shell csh . It is intended to be a conformant implementation of the IEEE POSIX Shell and Tools portion of the IEEE POSIX specification ( IEEE Standard 1003.1).
Why does bash use asynchronous commands and redirection?
The shell waits for synchronous commands to complete before accepting more input; asynchronous commands continue to execute in parallel with the shell while it reads and executes additional commands. The redirection constructs permit fine-grained control of the input and output of those commands.