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Full Discussion: awk - treating remaining columns as one
Top Forums Shell Programming and Scripting awk - treating remaining columns as one Post 302731197 by ctsgnb on Wednesday 14th of November 2012 12:07:34 PM
Old 11-14-2012
Quote:
Originally Posted by only4satish
could you please explain how does the below code works ?

sub(FS,RS); sub(FS,RS)
sub(FS,RS) substitue the Field Separator (whose default value is a space " ") with a Record Separator (whose default value is a newline "\n")

It does this substitution only once , so the first FS met is changed into a RS.
That is the reason why it is important to make sure that the first FS encountered is one between the fist field $1 and second field $2.
 

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LEARN ABOUT NETBSD

vgs

VGS(8)							      System Manager's Manual							    VGS(8)

NAME

       vgs - report information about volume groups

SYNOPSIS

       vgs   [--aligned]   [-d|--debug]   [-h|-?|--help]   [--ignorelockingfailure]  [--nameprefixes]  [--noheadings]  [--nosuffix]  [-o|--options
       [+]Field[,Field]]  [-O|--sort  [+|-]Key1[,[+|-]Key2[,...]]]   [-P|--partial]  [--rows]  [--separator  Separator]  [--unbuffered]   [--units
       hsbkmgtHKMGT] [--unquoted] [-v|--verbose] [--version] [VolumeGroupName [VolumeGroupName...]]

DESCRIPTION

       vgs produces formatted output about volume groups.

OPTIONS

       See lvm for common options.

       --aligned
	      Use with --separator to align the output columns.

       --nameprefixes
	      Add  an  "LVM2_" prefix plus the field name to the output.  Useful with --noheadings to produce a list of field=value pairs that can
	      be used to set environment variables (for example, in udev (7) rules).

       --noheadings
	      Suppress the headings line that is normally the first line of output.  Useful if grepping the output.

       --nosuffix
	      Suppress the suffix on output sizes.  Use with --units (except h and H) if processing the output.

       -o, --options
	      Comma-separated ordered list of columns.	Precede the list with '+' to append to the default selection  of  columns.   Column  names
	      are:  vg_fmt, vg_uuid, vg_name, vg_attr, vg_size, vg_free, vg_sysid, vg_extent_size, vg_extent_count, vg_free_count, max_lv, max_pv,
	      pv_count, lv_count, snap_count, vg_seqno, vg_tags, vg_mda_count, vg_mda_free, and vg_mda_size.  Any  "vg_"  prefixes  are  optional.
	      Columns  mentioned  in either pvs (8) or lvs (8) can also be chosen, but columns cannot be taken from both at the same time.  Use -o
	      help to view the full list of fields available.

	      The vg_attr bits are:

	      1  Permissions: (w)riteable, (r)ead-only

	      2  Resi(z)eable

	      3  E(x)ported

	      4  (p)artial

	      5  Allocation policy: (c)ontiguous, c(l)ing, (n)ormal, (a)nywhere, (i)nherited

	      6  (c)lustered

       -O, --sort
	      Comma-separated ordered list of columns to sort by.  Replaces the default selection. Precede any column with - for a reverse sort on
	      that column.

       --rows Output columns as rows.

       --separator Separator
	      String to use to separate each column.  Useful if grepping the output.

       --unbuffered
	      Produce output immediately without sorting or aligning the columns properly.

       --units hsbkmgtHKMGT
	      All sizes are output in these units: (h)uman-readable, (s)ectors, (b)ytes, (k)ilobytes, (m)egabytes, (g)igabytes, (t)erabytes.  Cap-
	      italise to use multiples of 1000 (S.I.) instead of 1024.	Can also specify custom (u)nits e.g.  --units 3M

       --unquoted
	      When used with --nameprefixes, output values in the field=value pairs are not quoted.

SEE ALSO

       lvm(8), vgdisplay(8), pvs(8), lvs(8)

Sistina Software UK					 LVM TOOLS 2.02.44-cvs (02-17-09)						    VGS(8)
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