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Full Discussion: Change order
Top Forums Shell Programming and Scripting Change order Post 302434929 by drl on Monday 5th of July 2010 08:21:53 PM
Old 07-05-2010
Hi.

Similar to that of Scrutinizer, but more explicit, and slightly less efficient (more division operations involving NR), but still a single pass over the data:
Code:
#!/usr/bin/env bash

# @(#) s1	Demonstrate reversal of lines 2 and 3 of trios.

# Infrastructure details, environment, commands for forum posts. 
# Uncomment export command to run script as external user.
# export PATH="/usr/local/bin:/usr/bin:/bin"
set +o nounset
pe() { for i;do printf "%s" "$i";done; printf "\n"; }
pl() { pe;pe "-----" ;pe "$*"; }
LC_ALL=C ; LANG=C ; export LC_ALL LANG
pe ; pe "Environment: LC_ALL = $LC_ALL, LANG = $LANG"
pe "(Versions displayed with local utility \"version\")"
c=$( ps | grep $$ | awk '{print $NF}' )
version >/dev/null 2>&1 && s=$(_eat $0 $1) || s=""
[ "$c" = "$s" ] && p="$s" || p="$c"
version >/dev/null 2>&1 && version "=o" $p printf awk
set -o nounset
pe

FILE=${1-data1}

# Display sample of data file, with head & tail as a last resort.
pe " || start [ first:middle:last ]"
specimen $FILE \
|| { pe "(head/tail)"; head -n 5 $FILE; pe " ||"; tail -n 5 $FILE; }
pe " || end"

pl " Results:"
awk '
(NR % 3) == 1 { print ; next }
(NR % 3) == 2 { hold = $0; next }
              { print ; print hold }
' $FILE |
tee t1

# Check results.

pl " Comparison with desired results:"
if [ ! -f expected-output.txt -o ! -s expected-output.txt ]
then
  pe " Comparison file \"expected-output.txt\" zero-length or missing."
  exit
fi
if cmp expected-output.txt t1
then
  pe " Passed -- files have same content."
else
  pe " Failed -- files not identical -- detailed comparison follows."
  if diff -b expected-output.txt t1
  then
    pe " Passed by ignoring whitespace differences."
  fi
fi

exit 0

producing:
Code:
% ./s1

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version")
OS, ker|rel, machine: Linux, 2.6.26-2-amd64, x86_64
Distribution        : Debian GNU/Linux 5.0 
GNU bash 3.2.39
printf - is a shell builtin [bash]
GNU Awk 3.1.5

 || start [ first:middle:last ]
Whole: 5:0:5 of 6 lines in file "data1"
aaaaaaaaaa
bbbbbbbbb
cccccccc
aaaaaaaaaa
bbbbbbbbb
cccccccc
 || end

-----
 Results:
aaaaaaaaaa
cccccccc
bbbbbbbbb
aaaaaaaaaa
cccccccc
bbbbbbbbb

-----
 Comparison with desired results:
 Passed -- files have same content.

cheers, drl
This User Gave Thanks to drl For This Post:
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LEARN ABOUT SUNOS

env

env(1)								   User Commands							    env(1)

NAME

       env - set environment for command invocation

SYNOPSIS

       /usr/bin/env [-i | -]  [name=value...] [ utility [ arg... ]]

       /usr/xpg4/bin/env [-i | -]  [name=value...] [ utility [ arg... ]]

DESCRIPTION

       The  env utility obtains the current environment, modifies it according to its arguments, then invokes the utility named by the utility op-
       erand with the modified environment.

       Optional arguments are passed to utility. If no utility operand is specified, the resulting environment is written to the standard  output,
       with one name=value pair per line.

   /usr/bin
       If env executes commands with arguments, it uses the default shell /usr/bin/sh (see sh(1)).

   /usr/xpg4/bin
       If env executes commands with arguments, it uses /usr/xpg4/bin/sh (see ksh(1)).

OPTIONS

       The following options are supported:

       -i | -	       Ignores the environment that would otherwise be inherited from the current shell.  Restricts the environment for utility to
		       that specified by the arguments.

OPERANDS

       The following operands are supported:

       name=value      Arguments of the form name=value modify the execution environment, and are placed into  the  inherited  environment  before
		       utility is invoked.

       utility	       The name of the utility to be invoked.  If utility names any of the special shell built-in utilities, the results are unde-
		       fined.

       arg	       A string to pass as an argument for the invoked utility.

EXAMPLES

       Example 1: Invoking utilities with new PATH values

       The following utility:

       example% env -i PATH=/mybin mygrep xyz myfile

       invokes the utility mygrep with a new PATH value as the only entry in its environment. In this case, PATH is used to locate  mygrep,  which
       then must reside in /mybin.

ENVIRONMENT VARIABLES

       See  environ(5)	for  descriptions of the following environment variables that affect the execution of env: LANG, LC_ALL, LC_CTYPE, LC_MES-
       SAGES, and NLSPATH.

       PATH	Determine the location of the utility. If PATH is specified as a name=value operand to env, the value given shall be used  in  the
		search for utility.

EXIT STATUS

       If  utility  is invoked, the exit status of env is the exit status of utility. Otherwise, the env utility returns one of the following exit
       values:

       0	Successful completion.

       1-125	An error occurred.

       126	utility was found but could not be invoked.

       127	utility could not be found.

ATTRIBUTES

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

   /usr/bin
       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+
       |CSI			     |enabled			   |
       +-----------------------------+-----------------------------+

   /usr/xpg4/bin
       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWxcu4			   |
       +-----------------------------+-----------------------------+
       |CSI			     |enabled			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       ksh(1), sh(1), exec(2), profile(4), attributes(5), environ(5), standards(5)

SunOS 5.10							    2 Jan 2002								    env(1)
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