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Shell Programming and Scripting
until loop Perl
Post 302450680 by cold_Que on Friday 3rd of September 2010 12:15:04 PM
09-03-2010
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my $i;
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LEARN ABOUT ULTRIX
col
col(1) General Commands Manual col(1) Name col - filter reverse line feeds Syntax col [-options] Description The command reads the standard input and writes the standard output. It performs the line overlays implied by reverse line feeds (ESC-7 in ASCII) and by forward and reverse half line feeds (ESC-9 and ESC-8, respectively). The command is particularly useful for filtering multi- column output made with the command of and for filtering output resulting from the preprocessor. Although accepts half line motions in its input, it does not normally output them. Instead, text that would appear between lines is moved to the next lower full line boundary. The control characters SO (ASCII code 017) and SI (ASCII code 016) are assumed to start and end text in an alternate character set. The character set (primary or alternate) associated with each printing character read is remembered. On output, SO and SI characters are gen- erated where necessary to maintain the correct treatment of each character. The command normally converts white space to tabs to shorten printing time. If the -h option is given, this conversion is suppressed. On input, the only control characters accepted are <space>, <backspace>, <tab>, <return>, <newline>, etc... The VT character is an alter- nate form of full reverse linefeed, included for compatibility with earlier programs of this type. All other non-printing characters are ignored. Options -b Assumes that the output device does not have backspacing. -f Suppresses moving half lines to the next full line. -h Suppresses conversion of white space to tabs. -p Forces through unchanged any unknown escape sequences that are found in its input. This option should be used with care. -x Suppresses conversion of white space to tabs (same as -h). Restrictions Cannot back up more than 128 lines. No more than 800 characters, including backspaces, on a line. See Also tbl(1), nroff(1) col(1)