fabsl - Linux


fabsl is a command-line utility for calculating the absolute value (magnitude) of a floating-point number. It provides a practical way to convert negative numbers to their positive counterparts, making it useful in various scientific, mathematical, and engineering applications.


fabsl [options] <floating-point-number>


  • -h, –help: Displays help information and usage instructions.
  • -v, –version: Prints the version of fabsl.
  • -d, –debug: Enables debug mode, providing additional information for troubleshooting.


  • Calculate the absolute value of -10.5:
fabsl -10.5
  • Store the absolute value of a variable in a shell script:
abs_value=$(fabsl $value)

Common Issues

  • Ensure that the input value is a valid floating-point number. Non-numeric or invalid inputs will result in an error.
  • Handle negative infinity gracefully. fabsl does not convert negative infinity to positive infinity.


fabsl can be used in conjunction with other commands to enhance functionality:

  • With bc: Calculate the absolute value within a more complex expression:
echo "scale=2; fabsl(-10.55)" | bc

Related Commands

  • abs: Calculates the absolute value of an integer.
  • Fortran abs: Absolute value function in Fortran programming language.

For further information, refer to the official documentation on Fortran’s abs function: https://www.tutorialspoint.com/fortran/fortran_abs.htm