C-shell

C-shell, often abbreviated as csh, is a Unix shell that provides an interactive command-line interface and scripting capabilities. Originally developed by Bill Joy for the BSD (Berkeley Software Distribution) Unix, it enhances the user interface with features like a C-like syntax and job control.

• Key Features:
  • C-like Syntax: C-shell incorporates a syntax similar to the C programming language, making it familiar for those accustomed to C.
  • Job Control: It allows users to manage multiple processes concurrently, with commands to put jobs in the background or bring them to the foreground.
  • History Mechanism: C-shell maintains a history of commands, enabling users to recall and reuse previous commands easily.
  • Alias and Variable Management: Users can create aliases for commands and manage variables efficiently.
  • Scriptability: It supports writing shell scripts, which allows automation of tedious tasks.
• Basic Commands:
  • alias: Create shortcuts for commands.
  • set: Assign values to shell variables.
  • jobs: List active jobs in the shell.
  • fg: Bring a background job to the foreground.
  • bg: Send a job to the background.
• File Scripting:

C-shell scripts are typically saved with a .csh or .tcsh extension. A simple structure of a C-shell script might look like this:

#!/bin/csh
echo "Hello, World!"
set name = "Your Name"
echo "This script is run by $name"

• Usage Scenarios:

C-shell is commonly used in environments where its syntactical advantages and features are beneficial. However, it is less popular than the Bourne Again Shell (bash) among modern users, largely due to the latter's expanded feature set and widespread adoption.

• https://en.wikipedia.org/wiki/C_shell