[PDF] best bash cheat sheet

  • What is ${} in bash?

    The ${} syntax in Bash is used for parameter expansion. It is a way to manipulate and retrieve the value of a variable. The syntax consists of a dollar sign ( $ ) followed by a pair of curly braces ( {} ) containing the variable name or an expression.

  • What does $1 do in bash?

    In a bash script or function, $1 denotes the initial argument passed, $2 denotes the second argument passed, and so forth. This script takes a name as a command-line argument and prints a personalized greeting. echo "Hello, $1" We have supplied Zaira as our argument to the script.

  • How do I get better at bash scripting?

    5 ways to improve your Bash scripts

    1The conditional statement. Just as with so many other programming languages, the conditional has been a powerful and common feature. 2Limit execution. You might want to limit a script to only be run by a specific user. 3Use arguments. 4User input. 5Exit on failure. 68 Comments.
  • For example, you can use the following inputs in your shell scripts: $0 - The name of the script. $1 - The first command-line argument passed to the script. $2 - The second command-line argument passed to the script.
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