commandlinetools's Introduction

Command line tools

In the years I have been programming, I have written many command line tools. Most of them were useful but have been superseded by tools that came with the operating system. But some have survived, and so I kept them. I want to share some of them with you.

cal: A tool which prints the calendar for one or more months to the screen.
echoc: A simple tool to display a string in different colours.
eolconv: A tool that converts all line endings of a text file to a specified style or to the default for the platform.
exact: A tool to show the exact values of floating point variables in single, double and extended precision and in hex.
slack: A tool which calculates the disk space wasted, because of cluster size, on the files in a certain directory.
whereis: A tool which tries to find which executable (or executables) will be called if you enter its name on the command line.

More about these tools on my web pages.

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Exact 0 crash

Exact crashes with argument 0 if compiled as 32-bit, i.e. if 10-byte extendes are available.

D:\TMP>D:\DMX\M18\DCC32 -b exact.dpr
Embarcadero Delphi for Win32 compiler version 25.0
Copyright (c) 1983,2013 Embarcadero Technologies, Inc.
 Velthuis.StrConsts.pas(62)
Velthuis.Numerics.pas(810)
Velthuis.RandomNumbers.pas(307)
Velthuis.Sizes.pas(71)
Velthuis.FloatUtils.pas(317)
bases.inc(94)
Velthuis.BigIntegers.pas(11106)
Velthuis.BigDecimals.pas(2353)
exact.dpr(128) Hint: H2164 Variable 'BD' is declared but never used in 'HexValue
'
exact.dpr(160) Hint: H2164 Variable 'Value' is declared but never used in 'Exact
Value'
exact.dpr(198)
15325 lines, 0.11 seconds, 175528 bytes code, 28412 bytes data.

D:\TMP>exact 0
The value:    0 (0)

32 bit float: 0
Hex:          00000000

64 bit float: 0
Hex:          0000000000000000

EInvalidOp: Invalid floating point operation

Same with Delphi 10.2 Version 25.0.29899.2631 (Update 3)

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