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Top Forums Shell Programming and Scripting Join multiple files by column with awk Post 302454526 by ikki on Saturday 18th of September 2010 04:56:25 PM
Old 09-18-2010
Quote:
Originally Posted by malandisa
So I used 'awk' in place of 'cut'. I still want to know how to use cut when the delimiter is more than 1 space.
It's not possible with cut, it's designed to work with a single character as the field delimeter, that's why awk is propably the better choice here. Other way, if one really wants to use cut or perhaps just to sanitize data, would be to replace all multiple repetitions of space by a single space (or tab). That of course assumes that any field can't be empty (or non-space, to be exact), or the result would be skewed.



For future reference: there are at least two easy ways of squeezing multiple instances of a char to a single instance (below). sed is a powerful companion to awk, or so I'm told Smilie, but even alone I find it a very useful tool:

Code:
sed -e 's/ \{1,\}/ /g' | cut... # I usually use the gnu version, since I have easier time remembering what chars I should escape and what not
tr -s " " | cut...

 

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CUT(1)							    BSD General Commands Manual 						    CUT(1)

NAME
cut -- select portions of each line of a file SYNOPSIS
cut -b list [-n] [file ...] cut -c list [file ...] cut -f list [-d delim] [-s] [file ...] DESCRIPTION
The cut utility selects portions of each line (as specified by list) from each file and writes them to the standard output. If the file argument is a single dash ('-') or no file arguments were specified, lines are read from the standard input. The items specified by list can be in terms of column position or in terms of fields delimited by a special character. Column numbering starts from 1. list is a comma or whitespace separated set of increasing numbers and/or number ranges. Number ranges consist of a number, a dash (-), and a second number and select the fields or columns from the first number to the second, inclusive. Numbers or number ranges may be preceded by a dash, which selects all fields or columns from 1 to the first number. Numbers or number ranges may be followed by a dash, which selects all fields or columns from the last number to the end of the line. Numbers and number ranges may be repeated, overlapping, and in any order. It is not an error to select fields or columns not present in the input line. The options are as follows: -b list The list specifies byte positions. -c list The list specifies character positions. -d string Use the first character of string as the field delimiter character. The default is the <TAB> character. -f list The list specifies fields, separated by the field delimiter character. The selected fields are output, separated by the field delimiter character. -n Do not split multi-byte characters. -s Suppresses lines with no field delimiter characters. Unless specified, lines with no delimiters are passed through unmodified. EXIT STATUS
cut exits 0 on success, 1 if an error occurred. SEE ALSO
paste(1) STANDARDS
The cut utility conforms to IEEE Std 1003.2-1992 (``POSIX.2''). BSD
December 21, 2008 BSD
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