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Test Your Knowledge in Computers #131
Difficulty: Easy
UNIX certification is based on the 'Single Unix Specification' which is an extension of IEEE 1003 (POSIX).
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tk(1) [bsd man page]

TK(1)							      General Commands Manual							     TK(1)

NAME
tk - paginator for the Tektronix 4014 SYNOPSIS
tk [ -t ] [ -N ] [ -pL ] [ file ] DESCRIPTION
The output of tk is intended for a Tektronix 4014 terminal. Tk arranges for 66 lines to fit on the screen, divides the screen into N col- umns, and contributes an eight space page offset in the (default) single-column case. Tabs, spaces, and backspaces are collected and plot- ted when necessary. Teletype Model 37 half- and reverse-line sequences are interpreted and plotted. At the end of each page tk waits for a newline (empty line) from the keyboard before continuing on to the next page. In this wait state, the command !command will send the command to the shell. The command line options are: -t Don't wait between pages; for directing output into a file. -N Divide the screen into N columns and wait after the last column. -pL Set page length to L lines. SEE ALSO
pr(1) 7th Edition April 29, 1985 TK(1)

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COL(1)								   User Commands							    COL(1)

NAME
col - filter reverse line feeds from input SYNOPSIS
col [options] DESCRIPTION
col filters out reverse (and half-reverse) line feeds so the output is in the correct order with only forward and half-forward line feeds, and replaces white-space characters with tabs where possible. This can be useful in processing the output of nroff(1) and tbl(1). col reads from standard input and writes to standard output. OPTIONS
-b, --no-backspaces Do not output any backspaces, printing only the last character written to each column position. -f, --fine Forward half line feeds are permitted fine mode. Normally characters printed on a half-line boundary are printed on the following line. -p, --pass Force unknown control sequences to be passed through unchanged. Normally, col will filter out any control sequences from the input other than those recognized and interpreted by itself, which are listed below. -h, --tabs Output tabs instead of multiple spaces. -x, --spaces Output multiple spaces instead of tabs. -l, --lines number Buffer at least number lines in memory. By default, 128 lines are buffered. -V, --version Output version information and exit. -H, --help Output help and exit. NOTES
The control sequences for carriage motion that col understands and their decimal values are listed in the following table: ESC-7 reverse line feed (escape then 7) ESC-8 half reverse line feed (escape then 8) ESC-9 half forward line feed (escape then 9) backspace moves back one column (8); ignored in the first column newline forward line feed (10); also does carriage return carriage return (13) shift in shift to normal character set (15) shift out shift to alternate character set (14) space moves forward one column (32) tab moves forward to next tab stop (9) vertical tab reverse line feed (11) All unrecognized control characters and escape sequences are discarded. col keeps track of the character set as characters are read and makes sure the character set is correct when they are output. If the input attempts to back up to the last flushed line, col will display a warning message. SEE ALSO
expand(1), nroff(1), tbl(1) STANDARDS
The col utility conforms to the Single UNIX Specification, Version 2. The -l option is an extension to the standard. HISTORY
A col command appeared in Version 6 AT&T UNIX. AVAILABILITY
The col command is part of the util-linux package and is available from Linux Kernel Archive <ftp://ftp.kernel.org/pub/linux/utils/util- linux/>. util-linux September 2011 COL(1)

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