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Full Discussion: Grep multiple keywords from a file
Top Forums Shell Programming and Scripting Grep multiple keywords from a file Post 302997418 by drl on Friday 12th of May 2017 09:38:32 PM
Old 05-12-2017
Hi.

Here are a few alternatives; One is the use of shell expressions, the other is a relative of grep, agrep:
Code:
#!/usr/bin/env ksh
#!/usr/bin/env bash
#!/usr/bin/env zsh

# @(#) s1       Demonstrate match multiple strings AND and OR, agrep, shell.

# Utility functions: print-as-echo, print-line-with-visual-space.
LC_ALL=C ; LANG=C ; export LC_ALL LANG
pe() { for _i;do printf "%s" "$_i";done; printf "\n"; }
pl() { pe;pe "-----" ;pe "$*"; }
em() { pe "$*" >&2 ; }
db() { ( printf " db, ";for _i;do printf "%s" "$_i";done;printf "\n" ) >&2 ; }
db() { : ; }
C=$HOME/bin/context && [ -f $C ] && . $C dixf agrep

FILE=${1-data1}
pl " Data file $FILE:"
cat $FILE

pl " With agrep, \"and\":a b c :"
agrep "a;b;c" $FILE

pl " With agrep, \"or\":a b c :"
agrep "a,b,c" $FILE

# A pattern-list is a list of one or more patterns
# separated from each other with a & or |. A & signifies
# that all patterns must be matched whereas | requires
# that only one pattern be matched. 

# shopt -s extglob
# shopt extglob

pl " With shell expressions, \"and\", a b c ksh (bash, zsh fail):"
while read line
do
  if [[ $line == @(*a*&*b*&*c*) ]]
  then
    pe "Matched line: $line"
  fi
done < $FILE

pl " With shell expressions, \"or\", a b c ksh (zsh fail):"
while read line
do
  if [[ $line == @(*a*|*b*|*c*) ]]
  then
    pe "Matched line: $line"
  fi
done < $FILE

pl " Some detail about agrep:"
dixf agrep

exit $?

producing:
Code:
$ ./s1

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version")
OS, ker|rel, machine: Linux, 3.16.0-4-amd64, x86_64
Distribution        : Debian 8.7 (jessie) 
ksh 93u+
dixf (local) 1.42
agrep - ( /usr/bin/agrep, 2012-04-12 )

-----
 Data file data1:
also
abracadabra
chock full of beans
hello, world.
silent

-----
 With agrep, "and":a b c :
abracadabra
chock full of beans

-----
 With agrep, "or":a b c :
also
abracadabra
chock full of beans

-----
 With shell expressions, "and", a b c ksh (bash, zsh fail):
Matched line: abracadabra
Matched line: chock full of beans

-----
 With shell expressions, "or", a b c ksh (zsh fail):
Matched line: also
Matched line: abracadabra
Matched line: chock full of beans

-----
 Some detail about agrep:
agrep   search a file for a string or regular expression, with... (man)
Path    : /usr/bin/agrep
Version : - ( /usr/bin/agrep, 2012-04-12 )
Type    : ELF 64-bit LSB shared object, x86-64, version 1 (S ...)
Help    : probably available with -h
Repo    : Debian 8.7 (jessie)

The agrep will be much faster for files of more than trivial size.

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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