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Getting User Input Via Keyboard. Perform arithmetic operations. Create an integer variable. Create the constants variable. Bash variable existence check. Customize the bash shell environments. Recalling command history. Path name expansion. Create and use aliases.
Ksh is an acronym for K orn SH ell. It is a shell and programming language that executes commands read from a terminal or a file. It was developed by David Korn at AT&T Bell Laboratories in the early 1980s. It is backwards-compatible with the Bourne shell and includes many features of the C shell.
Syntax. command1 || command2. OR. First_command || Second_command. command2 is executed if, and only if, command1 returns a non-zero exit status. In other words, run command1 successfully or run command2.
Introduction to the Bash Shell. A command line is a text user interface. One can use such an interface to provide instructions to a Linux powered computer. Under Linux, a programmed called shell used to provide a Linux command line user interface.
Syntax. command1 && command2. OR. First_command && Second_command. command2 is executed if, and only if, command1 returns an exit status of zero (true). In other words, run command1 and if it is successfull, then run command2.
Zsh has command line editing, builtin spelling correction, programmable command completion, shell functions (with autoloading), a history mechanism, and a host of other features.
User specific ~/.bashrc file for interactive bash shells. You can add your settings to this file.
The case statement allows you to easily check pattern (conditions) and then process a command-line if that condition evaluates to true. In other words the $variable-name is compared against the patterns until a match is found. *) acts as default and it is executed if no match is found. The pattern can include wildcards.
Starting a Script With #! It is called a shebang or a "bang" line. It is nothing but the absolute path to the Bash interpreter. It consists of a number sign and an exclamation point character (#!), followed by the full path to the interpreter such as /bin/bash.
A Shell script can be defined as - "a series of command(s) stored in a plain text file". A shell script is similar to a batch file in MS-DOS , but it is much more powerful compared to a batch file. Shell scripts are a fundamental part of the UNIX and Linux programming environment.