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User Commands expand(1)
NAME
expand, unexpand - expand TAB characters to SPACE charac-
ters, and vice versa
SYNOPSIS
expand [-t tablist] [file...]
expand [-tabstop] [ -tab1, tab2,. . ., tabn] [file...]
unexpand [-a] [-t tablist] [file...]
DESCRIPTION
The expand utility copies files (or the standard input) to
the standard output, with TAB characters expanded to SPACE
characters. BACKSPACE characters are preserved into the out-
put and decrement the column count for TAB calculations.
expand is useful for pre-processing character files (before
sorting, looking at specific columns, and so forth) that
contain TAB characters.
unexpand copies files (or the standard input) to the stan-
dard output, putting TAB characters back into the data. By
default, only leading SPACE and TAB characters are converted
to strings of tabs, but this can be overridden by the -a
option (see the OPTIONS section below).
OPTIONS
The following options are supported for expand:
-t tablist Specifies the tab stops. The argu-
ment tablist must consist of a sin-
gle positive decimal integer or mul-
tiple positive decimal integers,
separated by blank characters or
commas, in ascending order. If a
single number is given, tabs will be
set tablist column positions apart
instead of the default 8. If multi-
ple numbers are given, the tabs will
be set at those specific column
positions.
Each tab-stop position N must be an
integer value greater than zero, and
the list must be in strictly ascend-
ing order. This is taken to mean
that, from the start of a line of
output, tabbing to position N causes
the next character output to be in
the (N+1)th column position on that
line.
SunOS 5.10 Last change: 1 Feb 1995 1
User Commands expand(1)
In the event of expand having to
process a tab character at a posi-
tion beyond the last of those speci-
fied in a multiple tab-stop list,
the tab character is replaced by a
single space character in the out-
put.
-tabstop Specifies as a single argument, sets
TAB characters tabstop SPACE charac-
ters apart instead of the default 8.
-tab1,tab2,...,tabn Sets TAB characters at the columns
specified by -tab1,tab2,...,tabn
The following options are supported for unexpand:
-a Inserts TAB characters when replacing a run
of two or more SPACE characters would pro-
duce a smaller output file.
-t tablist Specifies the tab stops. The option-argument
tablist must be a single argument consisting
of a single positive decimal integer or mul-
tiple positive decimal integers, separated
by blank characters or commas, in ascending
order. If a single number is given, tabs
will be set tablist column positions apart
instead of the default 8. If multiple
numbers are given, the tabs will be set at
those specific column positions. Each tab-
stop position N must be an integer value
greater than zero, and the list must be in
strictly ascending order. This is taken to
mean that, from the start of a line of out-
put, tabbing to position N will cause the
next character output to be in the (N+1)th
column position on that line. When the -t
option is not specified, the default is the
equivalent of specifying -t 8 (except for
the interaction with -a, described below).
No space-to-tab character conversions occur
for characters at positions beyond the last
SunOS 5.10 Last change: 1 Feb 1995 2
User Commands expand(1)
of those specified in a multiple tab-stop
list.
When -t is specified, the presence or
absence of the -a option is ignored; conver-
sion will not be limited to the processing
of leading blank characters.
OPERANDS
The following ooperand is supported for expand and unexpand:
file The path name of a text file to be used as input.
ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment
variables that affect the execution of expand and unexpand:
LANG, LC_ALL, LC_CTYPE, LC_MESSAGES, and NLSPATH.
EXIT STATUS
The following exit values are returned:
0 Successful completion
>0 An error occurred.
ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Availability | SUNWesu |
|_____________________________|_____________________________|
| CSI | enabled |
|_____________________________|_____________________________|
| Interface Stability | Standard |
|_____________________________|_____________________________|
SEE ALSO
tabs(1), attributes(5), environ(5), standards(5)
SunOS 5.10 Last change: 1 Feb 1995 3
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This page was generated on Wed Sep 12 11:24:39 GMT 2007
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