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Full Discussion: awk - Must "touch" a $n-variable to get OFS used?
Top Forums Shell Programming and Scripting awk - Must "touch" a $n-variable to get OFS used? Post 302673979 by 244an on Wednesday 18th of July 2012 05:25:22 PM
Old 07-18-2012
awk - Must "touch" a $n-variable to get OFS used?
I'm having a small problem with awk. I tried to use it for replacing ";" with <tab>. But I have to "touch" one variable to get the <tab> in OFS to be used.
Code:
$ echo "xx;yy;zz" | awk -F';' 'BEGIN { OFS="\t" } { print $0; }'
xx;yy;zz                # no OFS used
$ echo "xx;yy;zz" | awk -F';' 'BEGIN { OFS="\t" } { print $0; print $1,$2}'
xx;yy;zz
xx      yy              # only OFS used for "field for field"
$ echo "xx;yy;zz" | awk -F';' 'BEGIN { OFS="\t" } { print $0; print $1,$2; print $0}'
xx;yy;zz
xx      yy
xx;yy;zz                # still no tab for $0
$ echo "xx;yy;zz" | awk -F';' 'BEGIN { OFS="\t" } { print $0; print $1,$2; print $0; $1=$1; }'
xx;yy;zz                # tested to "touch" $1 at the end, no success
xx      yy
xx;yy;zz
$ echo "xx;yy;zz" | awk -F';' 'BEGIN { OFS="\t" } { print $0; print $1,$2; print $0; $1=$1; print $0}'
xx;yy;zz
xx      yy
xx;yy;zz
xx      yy      zz      # ta-dam! here is OFS used, AFTER the "touch"
# and here is a "funny" result, in the first line OFS is used, but not for $0:
$ echo "xx;yy;zz" | awk -F';' 'BEGIN { OFS="\t" } { print "",$0; $1=$1; print "",$0 }'
        xx;yy;zz
        xx      yy      zz

I have googled but haven't find any information. Am I missing something? Or I have to do this:
Code:
echo "xx;yy;zz" | awk -F';' 'BEGIN { OFS="\t" } { $1=$1; print }'

Shell: bash, system: FreeBSD (is that correct info?)
 

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LEARN ABOUT OPENSOLARIS

touch

touch(1B)					     SunOS/BSD Compatibility Package Commands						 touch(1B)

NAME

       touch - change file access and modification times

SYNOPSIS

       /usr/ucb/touch [-acfm] file...

DESCRIPTION

       touch sets the access and modification times of each file to the current time. file is created if it does not already exist.

OPTIONS

       -a    Change the access time of file. Do not change the modification time unless -m is also specified.

       -c    Do not create file if it does not exist.

       -f    Attempt to force the touch in spite of read and write permissions on file.

       -m    Change the modification time of file. Do not change the access time unless -a is also specified.

USAGE

       See largefile(5) for the description of the behavior of touch when encountering files greater than or equal to 2 Gbyte ( 2^31 bytes).

EXIT STATUS

       The following exit values are returned:

       0     touch executed successfully and all requested changes were made.

       >0    An error occurred. touch returns the number of files for which the times could not be successfully modified.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWscpu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       touch(1), attributes(5), largefile(5)

SunOS 5.11							    26 Oct 1995 							 touch(1B)
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