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dcat: Concatenate File(s) to Standard Output or File
-A cat command-line and library implementation in Dart, inspired by the Write command-line apps sample code.
-Synopsis
-dcat copies each file, or standard input if none are given, to standard output or file.
-Command-Line Usage
-dcat --help
-Usage: dcat [OPTION]... [FILE]...
-Concatenate FILE(s) to standard output.
-
-With no FILE, or when FILE is -, read standard input.
-
- -A, --show-all equivalent to -vET
- -b, --number-nonblank number nonempty output lines, overrides -n
- -e, --show-nonprinting-ends equivalent to -vE
- -E, --show-ends display $ at end of each line
- -h, --help display this help and exit
- -n, --number number all output lines
- -t, --show-nonprinting-tabs equivalent to -vT
- -T, --show-tabs display TAB characters as ^I
- -s, --squeeze-blank suppress repeated empty output lines
- --version output version information and exit
- -v, --show-nonprinting use ^ and M- notation, except for LFD and TAB
-
-Examples:
- dcat f - g Output f's contents, then standard input, then g's contents.
- dcat Copy standard input to standard output.
-Compile Standalone Application
-*nix
-dart compile exe -o bin/dcat bin/dcat.dart
-Windows
-dart compile exe bin/dcat.dart
-Library Usage
-import 'package:dcat/dcat.dart';
-
-final result = await cat(['path/to/file', 'path/to/otherfile]'],
- File('path/to/outfile').openWrite());
-if (result.isFailure) {
- for (final message in result.messages) {
- print("Error: $message");
- }
-}
-The cat function supports the following parameters:
| Parameter | Description | Type |
|---|---|---|
| paths | The file paths. | String[] |
| output | The standard output or file. | IOSink |
| input | The standard input. | Stream |
| showEnds | Same as -e | bool |
| numberNonBlank | Same as -b | bool |
| showLineNumbers | Same as -n | bool |
| showTabs | Same as -T | bool |
| squeezeBlank | Same as -s | bool |
| showNonPrinting | Same as -v | bool |
-
-
pathsandoutputare required.
-outputshould be an IOSink such asstdoutor a File stream.
-inputcan be stdin.
-
The remaining optional parameters are similar to the GNU cat utility.
-A CatResult object is returned which contains the exitCode (exitSuccess or exitFailure) and error messages if any:
final result = await cat(['path/to/file'], stdout);
-if (result.exitCode == exitSuccess) {
- ...
-} else {
- for (final message in result.messages) {
- stderr.writeln("Error: $message");
- }
-}
-Libraries
--
-
- - dcat - - -
- A library to concatenate files to standard output or file. - - -