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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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fgrep(1)							   User Commands							  fgrep(1)

NAME
fgrep - search a file for a fixed-character string SYNOPSIS
/usr/bin/fgrep [-bchilnsvx] [-e pattern_list] [-f pattern-file] [pattern] [file...] /usr/xpg4/bin/fgrep [-bchilnsvx] [-e pattern_list] [-f pattern-file] [pattern] [file...] DESCRIPTION
The fgrep (fast grep) utility searches files for a character string and prints all lines that contain that string. fgrep is different from grep(1) and from egrep(1) because it searches for a string, instead of searching for a pattern that matches an expression. fgrep uses a fast and compact algorithm. The characters $, *, [, ^, |, (, ), and are interpreted literally by fgrep, that is, fgrep does not recognize full regular expressions as does egrep. These characters have special meaning to the shell. Therefore, to be safe, enclose the entire string within single quotes ('). If no files are specified, fgrep assumes standard input. Normally, each line that is found is copied to the standard output. The file name is printed before each line that is found if there is more than one input file. OPTIONS
The following options are supported: -b Precedes each line by the block number on which the line was found. This can be useful in locating block numbers by con- text. The first block is 0. -c Prints only a count of the lines that contain the pattern. -e pattern_list Searches for a string in pattern-list. This is useful when the string begins with a -. -f pattern-file Takes the list of patterns from pattern-file. -h Suppresses printing of files when searching multiple files. -i Ignores upper/lower case distinction during comparisons. -l Prints the names of files with matching lines once, separated by new-lines. Does not repeat the names of files when the pattern is found more than once. -n Precedes each line by its line number in the file. The first line is 1. -s Works silently, that is, displays nothing except error messages. This is useful for checking the error status. -v Prints all lines except those that contain the pattern. -x Prints only lines that are matched entirely. OPERANDS
The following operands are supported: file Specifies a path name of a file to be searched for the patterns. If no file operands are specified, the standard input will be used. /usr/bin/fgrep pattern Specifies a pattern to be used during the search for input. /usr/xpg4/bin/fgrep pattern Specifies one or more patterns to be used during the search for input. This operand is treated as if it were specified as -e pattern_list. USAGE
See largefile(5) for the description of the behavior of fgrep when encountering files greater than or equal to 2 Gbyte ( 2**31 bytes). ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables that affect the execution of fgrep: LC_COLLATE, LC_CTYPE, LC_MES- SAGES, and NLSPATH. EXIT STATUS
The following exit values are returned: 0 If any matches are found 1 If no matches are found 2 For syntax errors or inaccessible files, even if matches were found. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: /usr/bin/fgrep +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ /usr/xpg4/bin/fgrep +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWxcu4 | +-----------------------------+-----------------------------+ |CSI |Enabled | +-----------------------------+-----------------------------+ SEE ALSO
ed(1), egrep(1), grep(1), sed(1), sh(1), attributes(5), environ(5), largefile(5), XPG4(5) NOTES
Ideally, there should be only one grep command, but there is not a single algorithm that spans a wide enough range of space-time tradeoffs. Lines are limited only by the size of the available virtual memory. /usr/xpg4/bin/fgrep The /usr/xpg4/bin/fgrep utility is identical to /usr/xpg4/bin/grep -F (see grep(1)). Portable applications should use /usr/xpg4/bin/grep -F. SunOS 5.10 4 Oct 2002 fgrep(1)
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