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 CENTOS
column
COLUMN(1) User Commands COLUMN(1)
NAME
column - columnate lists
SYNOPSIS
column [options] file...
DESCRIPTION
The column utility formats its input into multiple columns. Rows are filled before columns. Input is taken from file or, by default, from
standard input. Empty lines are ignored.
OPTIONS
-c, --columns width
Output is formatted to a width specified as number of characters.
-t, --table
Determine the number of columns the input contains and create a table. Columns are delimited with whitespace, by default, or with
the characters supplied using the separator. Table output is useful for pretty-printing.
-s, --separator separators
Specify possible table delimiters (default is whitespace).
-o, --output-separator separators
Specify table output delimiter (default is two whitespaces).
-x, --fillrows
Fill columns before filling rows.
-h, --help
Print help and exit.
ENVIRONMENT
The environment variable COLUMNS is used to determine the size of the screen if no other information is available.
EXAMPLES
sed 's/#.*//' /etc/fstab | column -t
BUGS
The util-linux version 2.23 changed -s option to be non-greedy, for example:
$ printf "a:b:c
1::3
" | column -t -s ':'
old output:
a b c
1 3
new output (since util-linux 2.23)
a b c
1 3
SEE ALSO
colrm(1), ls(1), paste(1), sort(1)
HISTORY
The column command appeared in 4.3BSD-Reno.
AVAILABILITY
The column command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.
util-linux October 2010 COLUMN(1)