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echo began within Multics.After it was programmed in C by Doug McIlroy as a "finger exercise" and proved to be useful, it became part of Version 2 Unix. echo -n in Version 7 replaced prompt, (which behaved like echo but without terminating its output with a line delimiter).
If the date argument begins with a minus (-), only files modified on or before the given date are selected (older file / modified earlier). Otherwise, only files modified on or after the given date are selected (younger files / modified later). An explicit plus (+) may be given, but is the default. Note that both modes select files on the given ...
In computing, a here document (here-document, here-text, heredoc, hereis, here-string or here-script) is a file literal or input stream literal: it is a section of a source code file that is treated as if it were a separate file.
PowerShell is a task automation and configuration management program from Microsoft, consisting of a command-line shell and the associated scripting language.Initially a Windows component only, known as Windows PowerShell, it was made open-source and cross-platform on August 18, 2016, with the introduction of PowerShell Core. [5]
echo off rem This batch file deletes all .txt files in a specified directory pushd %1 del *.txt popd echo All text files deleted in the %1 directory Syntax [ edit ]
In computing, command substitution is a facility that allows a command to be run and its output to be pasted back on the command line as arguments to another command. . Command substitution first appeared in the Bourne shell, [1] introduced with Version 7 Unix in 1979, and has remained a characteristic of all later Uni
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These tools add a BOM when saving text as UTF-8, and cannot interpret UTF-8 unless the BOM is present or the file contains only ASCII. Windows PowerShell (up to 5.1) will add a BOM when it saves UTF-8 XML documents. However, PowerShell Core 6 has added a -Encoding switch on some cmdlets called utf8NoBOM so that document can be saved without BOM.