function::returnstr - Linux
Overview
function::returnstr is a powerful command-line utility designed to parse strings based on user-defined functions. It enables users to extract, modify, or convert specific segments of a string using custom logic. This command is particularly useful in data manipulation, scripting, and text processing tasks, empowering users to automate complex string transformations.
Syntax
function::returnstr <function> <string> [options]
Parameters
- function: The user-defined function to apply to the string.
- string: The input string to be processed.
Options
- -h, –help: Display the usage information and exit.
- -d, –delimiter: Specify the delimiter to use for parsing the string (default: comma).
- -o, –output: Set the output format (default: text).
JSON, CSV, XML, and YAML are supported. - -e, –escape: Specify the escape character used for special characters (default: backslash).
- -i, –ignore-case: Ignore case distinctions in the string comparison.
Examples
Extracting a substring
To extract the first five characters from a string, use:
function::returnstr substring:5 my_string
Converting to uppercase
To convert all characters in a string to uppercase, use:
function::returnstr toupper: my_string
Removing duplicate words
To remove duplicate words from a string, use a custom function and delimiter:
function::returnstr unique_words:\| my_string
Common Issues
Syntax errors
Ensure that the function syntax aligns with the expected format: <function_name>:<parameter>.
Incorrect output format
Verify that the specified output format (-o) matches the desired result type (e.g., JSON, CSV).
Integration
function::returnstr can be integrated with other Linux commands using pipes:
echo "my,string" | function::returnstr split:"," -o csv | sort
Related Commands
sed– A stream editor for text manipulation.awk– A pattern scanning and processing language.grep– A utility for searching and filtering text.
For more information, refer to the official documentation: