08-11-2012
Quote:
Originally Posted by
SkySmart
sorry about that. i meant to have all of them to be "===="
but why would u be nervous about doing this for large input files? is there a better solution?
That make it a little bit easier. You don't have to save the $2 values when you read a record, calculate the maximum field width for $2, and the output format string for the 2nd field just has "====" instead of having to print a string with the width of the longest $2 input value.
The determination of what a "large" file is depends on the size of your input file, the amount of memory on the machine, and the load on the machine. If you can figure out the maximum field widths for each field before you start reading the data and can build in the output format string instead of computing it on the fly, you don't have to store the entire file in awk's address space.
This User Gave Thanks to Don Cragun For This Post:
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LEARN ABOUT CENTOS
neaten
NEATEN(1) General Commands Manual NEATEN(1)
NAME
neaten - neaten up output columns
SYNOPSIS
neaten [ format ]
DESCRIPTION
Neaten reads from its standard input and neatens up columns separated by white space using the specified format. The format is a string
consisting of a positive integer followed by an alignment character and another integer. The alignment character is usually a decimal
point ('.'), but it can be any non-digit.
The alignment character is used as the central point of each column. The total column field width will be the number to the left of the
alignment character plus one for the alignment character itself plus the number to the right of the alignment character.
If a field does not contain the alignment character, it will be printed to the left of where the alignment character would have appeared.
If a field is too long to print within the specified format, the entire field will be printed and that row will not be aligned with the
rest.
The default format is "8.8".
EXAMPLE
To examine a file with columns of numbers:
neaten 10.8 < input | more
BUGS
Columns wider than the total width of the format specification will be printed without any separating white space.
The program does not do anything special with tabs on the input.
AUTHOR
Greg Ward
SEE ALSO
cnt(1), rcalc(1), rlam(1), total(1)
RADIANCE
11/15/93 NEATEN(1)