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Full Discussion: What is the difference in this two awk command?
Top Forums UNIX for Dummies Questions & Answers What is the difference in this two awk command? Post 302974224 by Scott on Thursday 26th of May 2016 03:35:04 PM
Old 05-26-2016
The first one turns ("casts") the "strings" into numbers.

If the output's the same on both, it's probably because the input is already numerical.

Code:
$ echo a b c | awk '{ print $1, $2, $3 }'
a b c
$ echo a b c | awk '{ print $1+0, $2, $3 }'
0 b c
$ echo a b c | awk '{ print $1+0, $2+0, $3 }'
0 0 c
$ echo a b 27 | awk '{ print $1+0, $2+0, $3 }'
0 0 27
$ echo a b 27 | awk '{ print $1+0, $2+0, $3+0 }'
0 0 27
$ echo a b 27 | awk '{ print $1+0, $2+0, $3+1 }'
0 0 28
$

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LEARN ABOUT OSX

echo

ECHO(1) 						    BSD General Commands Manual 						   ECHO(1)

NAME

     echo -- write arguments to the standard output

SYNOPSIS

     echo [-n] [string ...]

DESCRIPTION

     The echo utility writes any specified operands, separated by single blank (' ') characters and followed by a newline ('
') character, to the
     standard output.

     The following option is available:

     -n    Do not print the trailing newline character.  This may also be achieved by appending 'c' to the end of the string, as is done by iBCS2
	   compatible systems.	Note that this option as well as the effect of 'c' are implementation-defined in IEEE Std 1003.1-2001
	   (``POSIX.1'') as amended by Cor. 1-2002.  Applications aiming for maximum portability are strongly encouraged to use printf(1) to sup-
	   press the newline character.

     Some shells may provide a builtin echo command which is similar or identical to this utility.  Most notably, the builtin echo in sh(1) does
     not accept the -n option.	Consult the builtin(1) manual page.

EXIT STATUS

     The echo utility exits 0 on success, and >0 if an error occurs.

SEE ALSO

     builtin(1), csh(1), printf(1), sh(1)

STANDARDS

     The echo utility conforms to IEEE Std 1003.1-2001 (``POSIX.1'') as amended by Cor. 1-2002.

BSD
								  April 12, 2003							       BSD
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