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The command can be used to capture intermediate output before the data is altered by another command or program. The tee command reads standard input, then writes its content to standard output. It simultaneously copies the data into the specified file(s) or variables. The syntax differs depending on the command's implementation.
A pipeline of three program processes run on a text terminal In Unix-like computer operating systems , a pipeline is a mechanism for inter-process communication using message passing. A pipeline is a set of processes chained together by their standard streams , so that the output text of each process ( stdout ) is passed directly as input ...
In the case of an interactive shell, that is usually the text terminal which initiated the program. The file descriptor for standard output is 1 (one); the POSIX <unistd.h> definition is STDOUT_FILENO; the corresponding C <stdio.h> variable is FILE* stdout; similarly, the C++ <iostream> variable is std::cout.
The rule is that any redirection sets the handle to the output stream independently. So "2>&1" sets handle 2 to whatever handle 1 points to, which at that point usually is stdout. Then ">" redirects handle 1 to something else, e.g. a file, but it does not change handle 2, which still points to stdout.
On these computers, users can access a Unix-like command-line interface by running the terminal emulator program called Terminal, which is found in the Utilities sub-folder of the Applications folder, or by remotely logging into the machine using ssh. Z shell is the default shell for macOS; Bash, tcsh, and the KornShell are also provided.
Terminal program for Windows, Linux, OpenBSD, NetBSD, Mac OS X, and FreeBSD Telix: Character: Serial port: MS-DOS: Terminal emulator for MS-DOS (discontinued since 1997) Tera Term: Character: Serial port, SSH 1 & 2, Telnet, xmodem: Windows: Open-source, free, software terminal emulator for Windows Terminal: Character: Local macOS
With more than one argument, it concatenates several files. The combined result is by default also printed to the terminal, but often users redirect the result into yet another file. [9] Hence printing a single file to the terminal is a special use-case of this concatenation program. Yet, this is its most common use. [3]
Windows PowerShell provides the equivalent Get-Location cmdlet with the standard aliases gl and pwd. On Windows CE 5.0, the cmd.exe Command Processor Shell includes the pwd command. [16] pwd as found on Unix systems is part of the X/Open Portability Guide since issue 2 of 1987.