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  2. Redirection (computing) - Wikipedia

    en.wikipedia.org/wiki/Redirection_(computing)

    The reason for this is to distinguish between a file named '1' and stdout, i.e. cat file 2 >1 vs cat file 2 > & 1. In the first case, stderr is redirected to a file named ' 1 ' and in the second, stderr is redirected to stdout. Another useful capability is to redirect one standard file handle to another.

  3. Standard streams - Wikipedia

    en.wikipedia.org/wiki/Standard_streams

    File pointers stdin, stdout, and stderr are also provided. Ken Thompson (designer and implementer of the original Unix operating system) modified sort in Version 5 Unix to accept "-" as representing standard input, which spread to other utilities and became a part of the operating system as a special file in Version 8 .

  4. C shell - Wikipedia

    en.wikipedia.org/wiki/C_shell

    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. > file means stdout will be written to file, overwriting it ...

  5. tee (command) - Wikipedia

    en.wikipedia.org/wiki/Tee_(command)

    Example usage of tee: The output of ls -l is redirected to tee which copies them to the file file.txt and to the pager less. The name tee comes from this scheme - it looks like the capital letter T. The tee command is normally used to split the output of a program so that it can be both displayed and saved in a file. The command can be used to ...

  6. Comparison of command shells - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_command_shells

    Yes (stdin, stdout, stderr, stdout+stderr) Yes (via registry, TCMD.INI / 4NT.INI file, startup parameters, environment variables, SETDOS command) Yes (automatic via registry and TCSTART / 4START as well as TCEXIT / 4EXIT, or explicitly via /K startup option) Yes (via CALL command or /C and /K startup options) Yes No VMS DCL [22] OpenVMS

  7. File descriptor - Wikipedia

    en.wikipedia.org/wiki/File_descriptor

    File descriptors for a single process, file table and inode table. Note that multiple file descriptors can refer to the same file table entry (e.g., as a result of the dup system call [3]: 104 ) and that multiple file table entries can in turn refer to the same inode (if it has been opened multiple times; the table is still simplified because it represents inodes by file names, even though an ...

  8. C file input/output - Wikipedia

    en.wikipedia.org/wiki/C_file_input/output

    The C programming language provides many standard library functions for file input and output.These functions make up the bulk of the C standard library header <stdio.h>. [1] The functionality descends from a "portable I/O package" written by Mike Lesk at Bell Labs in the early 1970s, [2] and officially became part of the Unix operating system in Version 7.

  9. Remote Shell - Wikipedia

    en.wikipedia.org/wiki/Remote_Shell

    It opens a TCP socket to attacker IP at port 80 as a file descriptor. It then repeatedly read lines from the socket and run the line, piping both stdout and stderr back to the socket. In other words, it gives the attacker a remote shell on the machine.