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Full Discussion: AIX equivalent to GNU grep's -B and -A [print lines after or before matching lines]
Top Forums Shell Programming and Scripting AIX equivalent to GNU grep's -B and -A [print lines after or before matching lines] Post 302416670 by drl on Tuesday 27th of April 2010 10:48:27 AM
Old 04-27-2010
Hi.

You can use a perl work-alike, for example, wgrep, a windowing-grep. It is not a "call-alike" because the options are somewhat different. Here's a sample run on AIX 5.1:
Code:
#!/usr/bin/env bash

# @(#) s2       Demonstrate grep-like perl code "wgrep".
# See: http://sysunconfig.net/unixtips/wgrep.txt
# See also "ack": http://betterthangrep.com/

# Infrastructure details, environment, commands for forum posts. 
# Uncomment the export 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 "%s\n"; }
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 $4}' )
version >/dev/null 2>&1 && s=$(_eat $0 $1) || s=""
[ "$c" = "$s" ] && p="$s" || p="$c"
version >/dev/null 2>&1 && version "=o" $p perl ./wgrep
set -o nounset
pe

FILE=${1-data1}

# Display data file:"
cat $FILE

pe
pe " Expected results:"
cat expected-output.txt

pe
pe " Results:"
# ./ack -B 2 -A 1 corge $FILE | 
./wgrep -w2:1 -m corge $FILE |
tee t1

# Check results.

pe
pe " Comparison with desired results:"
if cmp expected-output.txt t1
then
  pe " Passed -- files are same."
else
  pe " Failed -- files differ -- details:"
  diff expected-output.txt t1
fi

exit 0

producing:
Code:
$ ./s2

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version")
OS, ker|rel, machine: AIX, 1, 000641284C00
GNU bash 3.00.16
perl 5.6.0
./wgrep wgrep 1.1

foo
bar
baz
qux
quux
corge
grault
garble
warg
fred
plugh
xyzzy
thud

 Expected results:
qux
quux
corge
grault

 Results:
qux
quux
corge
grault

 Comparison with desired results:
 Passed -- files are same.

So you could place wgrep in a directory in your PATH, say ~/bin, and use it directly.

There is a even better work-alike, "ack", that has many of the same options as GNU grep. That is also in perl, and it ran correctly in Linux, hp-ux, and Solaris. Regrettably, it did not run on the AIX 5.1 that I use -- but perhaps it would run on yours.

The URLs in the script comments point to the sites where you can get the code.

If you do not have or know how to create a ~/bin and place it into your PATH, please do some research -- that is a far more general question, but not difficult once one understands the principles involved.

Best wishes ... cheers, drl
 

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LEARN ABOUT OPENSOLARIS

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 5.11							    2 Jan 2002								    env(1)
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