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Full Discussion: advanced awk
Top Forums Shell Programming and Scripting advanced awk Post 302409266 by radoulov on Wednesday 31st of March 2010 01:47:42 PM
Old 03-31-2010
This one should work:
Code:
awk -v uname="user1" 'END {
  while (++j <= i) print netgroups[j]
  }
NF == 2 { currgrp = $1 }
$0 ~ uname { netgroups[++i] = currgrp }
' group_file

Use gawk, nawk or /usr/xpg4/bin/awk on Solaris.

---------- Post updated at 07:47 PM ---------- Previous update was at 07:39 PM ----------

Quote:
Originally Posted by scottn
It was a bit complicated, I think for the task?
[...]
Sure, no END block is needed Smilie


Code:
awk  'NF == 2 { g = $1 }
$NF ~ u && $0 = g x
' u="user1" group_file

One of the previous solutions will fail if the username is 0 Smilie

... and my code assumes unique group names.

Last edited by radoulov; 03-31-2010 at 02:52 PM..
 

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UNAME(1)						      General Commands Manual							  UNAME(1)

NAME
uname - display information about the system SYNOPSIS
uname [-amnrsv] DESCRIPTION
The uname command writes the name of the operating system implementation to standard output. When options are specified, strings repre- senting one or more system characteristics are written to standard output. The options are as follows: -a Behave as though the options -m, -n, -r , -s, and -v were specified. -m Write the type of the current hardware platform to standard output. -n Write the name of the system to standard output. -r Write the current release level of the operating system to standard output. -s Write the name of the operating system implementation to standard output. -v Write the version level of this release of the operating system to standard output. If the -a flag is specified, or multiple flags are specified, all output is written on a single line, separated by spaces. The uname utility exits 0 on success, and >0 if an error occurs. SEE ALSO
sysctl(8), sysctl(3), uname(3) HISTORY
The uname command appeared in 4.4BSD. STANDARDS
The command is expected to conform to the IEEE Std1003.2 (``POSIX'') specification. 4th Berkeley Distribution February 4, 1995 UNAME(1)
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