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Ctrl+i : Equivalent to the tab key. Ctrl+j : Equivalent to the enter key. Ctrl+k : Clears the line content after the cursor and copies it into the clipboard. Ctrl+l : Clears the screen content (equivalent to the command clear). Ctrl+n : recalls the next command (equivalent to the key ↓).
Carriage control tape on an IBM 1403 printer. One channel punch is visible in this photo. A carriage control tape was a loop of punched tape that was used to synchronize rapid vertical page movement in most IBM and many other line printers from unit record days through the 1960s. The tape loop was as long as the length of a single page.
The 63-key keyboard followed the ANSI X4.14-1971 typewriter layout, and included a further 19 keys for numeric input and various controls. The tractor feed was much more flexible, with a horizontally-fixed pin-drive on the left and an adjustable one on the right, allowing it to feed paper from 3 to 14.875 inches (76.2 to 377.8 mm) wide and to ...
The command was introduced in MS-DOS/IBM PC DOS 2.0. [17] [18] DR DOS 6.0 includes an implementation of the PRINT command. [19] In early versions of DOS, printing was accomplished using the copy command: the file to be printed was "copied" to the file representing the print device. [20] Control returned to the user when the print job completed ...
This repeats until the condition becomes false. Do while loops check the condition after the block of code is executed. This control structure can be known as a post-test loop. This means the do-while loop is an exit-condition loop. However a while loop will test the condition before the code within the block is executed.
The following example shows how command-line completion works in Bash. Other command line shells may perform slightly differently. First we type the first three letters of our command: fir Then we press Tab ↹ and because the only command in our system that starts with "fir" is "firefox", it will be completed to: firefox
As long as the system is responsive, infinite loops can often be interrupted by sending a signal to the process (such as SIGINT in Unix), or an interrupt to the processor, causing the current process to be aborted. This can be done in a task manager, in a terminal with the Control-C command, [9] or by using the kill command or system call.
Print spoolers [b] can be configured to add a banner page, also called a burst page, job sheet, or printer separator, to the beginning and end of each document and job. These separate documents from each other, identify each document (e.g. with its title ) and often also state who printed it (e.g. by username or job name).