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In computing, redirection is a form of interprocess communication, and is a function common to most command-line interpreters, including the various Unix shells that can redirect standard streams to user-specified locations. The concept of redirection is quite old, dating back to the earliest operating systems (OS).
By default, when csh runs a command, the command inherits the csh's stdio file handles for stdin, stdout and stderr, which normally all point to the console window where the C shell is running. The i/o redirection operators allow the command to use a file instead for input or output.
Hamilton C shell: Win32, OS/2 csh 1988 [12] Yes (OS/2 version no longer maintained) Optional Optional Proprietary: No Text-based CLI No No Yes (-t timestamp operator) Yes Yes (stdin, stdout, stdout+stderr) Yes (via variables and options) Yes (via login.csh, startup.csh and logout.csh) Yes (command line option) Yes Yes Scsh: POSIX: scsh 1994 Yes ? ?
An alternate method when using csh or tcsh is to pipe the output from stdout and stderr into a grep command. This example shows how to suppress lines that contain permission denied errors. This example shows how to suppress lines that contain permission denied errors.
GUIs created with scripting tools like Zenity and KDialog by KDE project [10] make use of stdin, stdout, and stderr, and are based on simple scripts rather than a complete GUI programmed and compiled in C/C++ using Qt, GTK, or other equivalent proprietary widget framework.
The C shell also introduced many features for interactive work, including the history and editing mechanisms, aliases, directory stacks, tilde notation, cdpath, job control and path hashing. On many systems, csh may be a symbolic link or hard link to TENEX C shell (tcsh), an improved version of Joy's original version. Although the interactive ...
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In computing, tee is a command in command-line interpreters using standard streams which reads standard input and writes it to both standard output and one or more files, effectively duplicating its input. [1]