Is bash special parameter?

Montana Fahey asked a question: Is bash special parameter?
Asked By: Montana Fahey
Date created: Tue, Jun 22, 2021 12:44 PM

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Top best answers to the question «Is bash special parameter»

  • Bash Shell has several special positional parameters which can be referenced but can not be assigned. These bash parameters are used to process command line arguments in a bash shell script, to get process status, exit status and options flag. These bash positional parameters can be assigned to a variable and values can be used for further processing.

FAQ

Those who are looking for an answer to the question «Is bash special parameter?» often ask the following questions:

💻 What is a parameter in bash?

  • In Bash, entities that store values are known as parameters. Their values can be strings or arrays with regular syntax, or they can be integers or associative arrays when special attributes are set with the declare built-in. There are three types of parameters: positional parameters, special parameters, and variables.

💻 How to get first parameter passed to bash?

  • The first bash argument (also known as a positional parameter) can be accessed within your bash script using the $1 variable. So in the count_lines.sh script, you can replace the filename variable with $1 as follows: #!/bin/bash nlines=$ (wc -l < $1) echo "There are $nlines lines in $1"

💻 How to hide a command line parameter in bash?

  • You could try encrypting the secret and have the command decrypt it before use. You can use LD_PRELOAD to have a library manipulate the command line arguments of some binary within the process of that binary itself, where ps does not pick it up. See this answer of mine on Server Fault for details.

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