04-23-2013
What shell are you using? What operating system are you using?
Does your shell provide a way to get the number of characters in the value of a variable?
If you have the number of characters in the value of a variable and the number characters in the field in which that value is to be centered, can you determine how many spaces and/or tabs need to be displayed before that value to center it in the first column?
If you have the number of characters in the value of the variable to be displayed in the 1st column and the number of characters in the value to be displayed in the 2nd column and the width of the 2nd column heading and the number of spaces between the 1st and 2nd column headings, can you figure out how many spaces and/or tabs need to be displayed between the two values to make the 2nd value appear in the center of the 2nd column?
Is the printf utility one of the utilities you're allowed to use for this assignment? If so, do you know how to specify the width of a string to be printed as a decimal value in the printf format string operand?
PS Please use CODE tags when showing us input and output as well as for shell code that you provide.
Last edited by Don Cragun; 04-23-2013 at 09:43 PM..
Reason: Add plea for CODE tags
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LEARN ABOUT OPENDARWIN
expand
EXPAND(1) BSD General Commands Manual EXPAND(1)
NAME
expand, unexpand -- expand tabs to spaces, and vice versa
SYNOPSIS
expand [-t tab1,tab2,...,tabn] [file ...]
unexpand [-a] [-t tab1,tab2,...,tabn] [file ...]
DESCRIPTION
The expand utility processes the named files or the standard input writing the standard output with tabs changed into blanks. Backspace
characters are preserved into the output and decrement the column count for tab calculations. The expand utility is useful for pre-process-
ing character files (before sorting, looking at specific columns, etc.) that contain tabs.
The unexpand utility puts tabs back into the data from the standard input or the named files and writes the result on the standard output.
The following options are available:
-a (unexpand only) By default, only leading blanks and tabs are reconverted to maximal strings of tabs. If the -a option is given, then
tabs are inserted whenever they would compress the resultant file by replacing two or more characters.
-t tab1,tab2,...,tabn
Set tab stops at column positions tab1, tab2, ..., tabn. If only a single number is given, tab stops are set that number of column
positions apart instead of the default number of 8.
ENVIRONMENT
The LANG, LC_ALL and LC_CTYPE environment variables affect the execution of expand and unexpand as described in environ(7).
DIAGNOSTICS
The expand and unexpand utilities exit 0 on success, and >0 if an error occurs.
STANDARDS
The expand and unexpand utilities conform to IEEE Std 1003.1-2001 (``POSIX.1'').
HISTORY
The expand command appeared in 3.0BSD.
BSD
April 21, 2002 BSD