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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(3)						     Library Functions Manual							  UNAME(3)

NAME
uname - get system identification SYNOPSIS
#include <sys/utsname.h> int uname(name) struct utsname *name DESCRIPTION
The uname function stores nul-terminated strings of information identifying the current system into the structure referenced by name. The utsname structure is defined in the <sys/utsname.h> header file, and contains the following members: sysname Name of the operating system implementation. nodename Network name of this machine. release Release level of the operating system. version Version level of the operating system. machine Machine hardware platform. RETURN VALUES
If uname is successful, 0 is returned, otherwise, -1 is returned and errno is set appropriately. ERRORS
The uname function may fail and set errno for any of the errors specified for the library functions sysctl(3). SEE ALSO
uname(1), sysctl(3) STANDARDS
The uname function conforms to IEEE Std1003.1-88 (``POSIX''). HISTORY
The uname function first appeared in 4.4BSD. 4th Berkeley Distribution February 4, 1995 UNAME(3)
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