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IRIX Base Documentation 1998 November
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IRIX 6.5.2 Base Documentation November 1998.img
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tabs.z
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tabs
Wrap
Text File
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1998-10-20
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10KB
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199 lines
TTTTAAAABBBBSSSS((((1111)))) TTTTAAAABBBBSSSS((((1111))))
NNNNAAAAMMMMEEEE
tabs - set tabs on a terminal
SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
ttttaaaabbbbssss [tabspec] [----TTTTtype] [++++mmmmn]
DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
_t_a_b_s sets the tab stops on the user's terminal according to the tab
specification _t_a_b_s_p_e_c, after clearing any previous settings. The user's
terminal must have remotely-settable hardware tabs.
_t_a_b_s_p_e_c Four types of tab specification are accepted for _t_a_b_s_p_e_c. They
are described below: canned (----_c_o_d_e), repetitive (----_n), arbitrary
(_n_1,_n_2,...), and file (--------_f_i_l_e). If no _t_a_b_s_p_e_c is given, the
default value is ----8888, i.e., UNIX system ``standard'' tabs. The
lowest column number is 1. Note that for _t_a_b_s, column 1 always
refers to the leftmost column on a terminal, even one whose
column markers begin at 0, e.g., the DASI 300, DASI 300s, and
DASI 450.
----_c_o_d_e Use one of the codes listed below to select a _c_a_n_n_e_d set of tabs.
The legal codes and their meanings are as follows:
----aaaa 1,10,16,36,72
Assembler, IBM S/370, first format
----aaaa2222 1,10,16,40,72
Assembler, IBM S/370, second format
----cccc 1,8,12,16,20,55
COBOL, normal format
----cccc2222 1,6,10,14,49
COBOL compact format (columns 1-6 omitted). Using this
code, the first typed character corresponds to card
column 7, one space gets you to column 8, and a tab
reaches column 12. Files using this tab setup should
include a format specification as follows (see _f_s_p_e_c(4)):
<<<<::::tttt----cccc2222 mmmm6666 ssss66666666 dddd::::>>>>
----cccc3333 1,6,10,14,18,22,26,30,34,38,42,46,50,54,58,62,67
COBOL compact format (columns 1-6 omitted), with more
tabs than ----cccc2222.... This is the recommended format for COBOL.
The appropriate format specification is (see _f_s_p_e_c(4)):
<<<<::::tttt----cccc3333 mmmm6666 ssss66666666 dddd::::>>>>
----ffff 1,7,11,15,19,23
FORTRAN
----pppp 1,5,9,13,17,21,25,29,33,37,41,45,49,53,57,61
PL/I
----ssss 1,10,55
SNOBOL
----uuuu 1,12,20,44
UNIVAC 1100 Assembler
PPPPaaaaggggeeee 1111
TTTTAAAABBBBSSSS((((1111)))) TTTTAAAABBBBSSSS((((1111))))
----_n A _r_e_p_e_t_i_t_i_v_e specification requests tabs at columns 1+_n, 1+2*_n,
etc. Of particular importance is the value 8888: this represents
the UNIX system ``standard'' tab setting, and is the most likely
tab setting to be found at a terminal. Another special case is
the value 0000, implying no tabs at all.
_n_1,_n_2,...
The _a_r_b_i_t_r_a_r_y format permits the user to type any chosen set of
numbers, separated by commas, in ascending order. Up to 40
numbers are allowed. If any number (except the first one) is
preceded by a plus sign, it is taken as an increment to be added
to the previous value. Thus, the formats 1111,11110000,22220000,33330000, and
1111,11110000,++++11110000,++++11110000 are considered identical.
--------_f_i_l_e If the name of a _f_i_l_e is given, _t_a_b_s reads the first line of the
file, searching for a format specification (see _f_s_p_e_c(4)). If it
finds one there, it sets the tab stops according to it, otherwise
it sets them as ----8888. This type of specification may be used to
make sure that a tabbed file is printed with correct tab
settings, and would be used with the _p_r(1) command:
ttttaaaabbbbssss -------- file; pppprrrr file
Any of the following also may be used; if a given flag occurs more than
once, the last value given takes effect:
----TTTT_t_y_p_e _t_a_b_s usually needs to know the type of terminal in order to set
tabs and always needs to know the type to set margins. _t_y_p_e is a
name listed in _t_e_r_m(5). If no ----TTTT flag is supplied, _t_a_b_s uses the
value of the environment variable TTTTEEEERRRRMMMM. If TTTTEEEERRRRMMMM is not defined
in the _e_n_v_i_r_o_n_m_e_n_t (see _e_n_v_i_r_o_n(5)), _t_a_b_s tries a sequence that
will work for many terminals.
++++mmmm_n The margin argument may be used for some terminals. It causes
all tabs to be moved over _n columns by making column _n+_1 the left
margin. If ++++mmmm is given without a value of _n, the value assumed
is 11110000. For a TermiNet, the first value in the tab list should be
1111, or the margin will move even further to the right. The normal
(leftmost) margin on most terminals is obtained by ++++mmmm0000. The
margin for most terminals is reset only when the ++++mmmm flag is given
explicitly.
EEEEXXXXAAAAMMMMPPPPLLLLEEEESSSS
ttttaaaabbbbssss ----aaaa example using -_c_o_d_e (_c_a_n_n_e_d specification) to set tabs to
the settings required by the IBM assembler: columns 1, 10,
16, 36, 72.
ttttaaaabbbbssss ----8888 example of using -_n (_r_e_p_e_t_i_t_i_v_e specification), where _n is
8888, causes tabs to be set every eighth position:
1+(1*8), 1+(2*8), ... which evaluate to columns 9, 17, ...
PPPPaaaaggggeeee 2222
TTTTAAAABBBBSSSS((((1111)))) TTTTAAAABBBBSSSS((((1111))))
ttttaaaabbbbssss 1111,,,,8888,,,,33336666 example of using _n_1,_n_2,... (_a_r_b_i_t_r_a_r_y specification) to set
tabs at columns 1, 8, and 36.
ttttaaaabbbbssss --------$$$$HHHHOOOOMMMMEEEE////ffffssssppppeeeecccc....lllliiiisssstttt////aaaatttttttt4444444422225555
example of using --_f_i_l_e (_f_i_l_e specification) to indicate
that tabs should be set according to the first line of
$_H_O_M_E/_f_s_p_e_c._l_i_s_t/_a_t_t_4_4_2_5 (see _f_s_p_e_c(4)).
DDDDIIIIAAAAGGGGNNNNOOOOSSSSTTTTIIIICCCCSSSS
_i_l_l_e_g_a_l _t_a_b_s when arbitrary tabs are ordered incorrectly
_i_l_l_e_g_a_l _i_n_c_r_e_m_e_n_t when a zero or missing increment is found in an
arbitrary specification
_u_n_k_n_o_w_n _t_a_b _c_o_d_e when a _c_a_n_n_e_d code cannot be found
_c_a_n'_t _o_p_e_n if --------_f_i_l_e option used, and file can't be opened
_f_i_l_e _i_n_d_i_r_e_c_t_i_o_n if --------_f_i_l_e option used and the specification in that
file points to yet another file. Indirection of this
form is not permitted
NNNNOOOOTTTTEEEESSSS
Hardware tabs must be enabled on the terminal device by entering the UNIX
command `_s_t_t_y _t_a_b_s'; otherwise the _t_a_b_s command will appear to have no
effect. Tab and margin setting is performed via the standard output.
There is no consistency among different terminals regarding ways of
clearing tabs and setting the left margin.
_t_a_b_s clears only 20 tabs (on terminals requiring a long sequence), but is
willing to set 64.
WWWWAAAARRRRNNNNIIIINNNNGGGG
The _t_a_b_s_p_e_c used with the _t_a_b_s command is different from the one used
with the _n_e_w_f_o_r_m(1) command. For example, ttttaaaabbbbssss ----8888 sets every eighth
position; whereas nnnneeeewwwwffffoooorrrrmmmm ----iiii----8888 indicates that tabs are set every eighth
position.
SSSSEEEEEEEE AAAALLLLSSSSOOOO
stty(1), newform(1), pr(1), tput(1), fspec(4), terminfo(4), environ(5),
term(5)
PPPPaaaaggggeeee 3333