fgrep -f : want to use 2 files at the same time

[Sangal-Arun]

Hi All,

Can someone pls tell whether we can use 2 files for -f parameter in grep or fgrep command simultaneously?

I want to search keywords (any keyword stored in 2 different files) from the output that i'm getting some stdout.
i.e. echo "somevalue"|fgrep -f file1,file2
or echo "somevalue"|fgrep -f file1 file2

Any helps! (And while p[12] is not working with fgrep command though it is working fine with ls command). Thanks-

Example below:

[/E*Fare/Users/qabuild/aksutil/dir] $ cat p1
arun
ARUN

[/E*Fare/Users/qabuild/aksutil/dir] $ cat p2
sangal
SANGAl
SANGAL

[/E*Fare/Users/qabuild/aksutil/dir] $ echo "arun"|grep -f p1
arun

[/E*Fare/Users/qabuild/aksutil/dir] $ echo "arun"|grep -f p2

[/E*Fare/Users/qabuild/aksutil/dir] $ echo "sangal"|grep -f p1

[/E*Fare/Users/qabuild/aksutil/dir] $ echo "sangal"|grep -f p2
sangal

[/E*Fare/Users/qabuild/aksutil/dir] $ ls -ltr p[12]
-rw-rw-r--  1 qabuild DENCCEFS 10 Apr 15 18:35 p1
-rw-rw-r--  1 qabuild DENCCEFS 21 Apr 15 18:35 p2

[/E*Fare/Users/qabuild/aksutil/dir] $ echo "sangal"|grep -f p[12]

[/E*Fare/Users/qabuild/aksutil/dir] $ echo "sangal"|grep -f p[21]

[/E*Fare/Users/qabuild/aksutil/dir] $

[anomie]

You could assign the search expression to a variable, e.g.:

$ EXPR='sangal'
$ grep "$EXPR" p1 p2

[Sangal-Arun]

You could assign the search expression to a variable, e.g.:

$ EXPR='sangal'
$ grep "$EXPR" p1 p2

That's right Anomie. But, this can be achieved simply by
grep "keyword" p[12]
grep "keyword" p* etc way, because we are mentioning the value of the keyword to be searched by ourself means..hardcoded at command prompt.

Now, what if you want to check sangal, Anomie, Pumba,...1000 keywords in in files starting with p (let's take we have only 2 files p1 and p2). But the pattern that we want to search should come from another file or stdout and not from us (i.e. we don't want to mention those 1000...n keywords at command prompt).

Thanks for your cover. still digging....
arun

[shorye]

I am late

[Sangal-Arun]

I am late

No, you are welcome to solve it. Any help!

[anomie]

we are mentioning the value of the keyword to be searched by ourself means..hardcoded at command prompt.

So don't hardcode it. Assign the value(s) of your operation to the variable. You can use egrep to search for more than one expression.

[Sangal-Arun]

So don't hardcode it. Assign the value(s) of your operation to the variable. You can use egrep to search for more than one expression.

yeah! egrep will help us out....but i thought we could achieve that with fgrep.

looks like fgrep doesn't support 2 files for having patterns....in one go.
well, thanks a lot.

[drl]

Hi.

... looks like fgrep doesn't support 2 files for having patterns....in one go.

If I understand your question, you have more than one pattern file that you would like to have considered in one call to grep.

Apologies for the long post, but this seems to work for me:

#!/usr/bin/env sh

# @(#) s1       Demonstrate selection of multiple pattern files, grep.

#  ____
# /
# |   Infrastructure BEGIN

echo
set -o nounset

debug=":"
debug="echo"

## The shebang using "env" line is designed for portability. For
#  higher security, use:
#
#  #!/bin/sh -

## Use local command version for the commands in this demonstration.

set +o nounset
echo "(Versions displayed with local utility \"version\")"
version >/dev/null 2>&1 && version =o $(_eat $0 $1) grep
set -o nounset

echo

FILE=${1-data1}
echo " Input file $FILE:"
cat $FILE

PAT1=a
echo
echo " Pattern file $PAT1:"
cat $PAT1

PAT2=b
echo
echo " Pattern file $PAT2:"
cat $PAT2

# |   Infrastructure END
# \
#  ---

echo
echo " Results from processing:"
grep -f $PAT1 -f $PAT2 $FILE

exit 0

Producing:

% ./s1

(Versions displayed with local utility "version")
Linux 2.6.11-x1
GNU bash, version 2.05b.0(1)-release (i386-pc-linux-gnu)
grep (GNU grep) 2.5.1

 Input file data1:
Now is the time
for all good men
to come to the aid
of their country.

In Xanadu did Kubla Khan
A stately pleasure-dome decree:
Where Alph, the sacred river, ran
Through caverns measureless to man
Down to a sunless sea.

 Pattern file a:
all
decree

 Pattern file b:
country
cavern

 Results from processing:
for all good men
of their country.
A stately pleasure-dome decree:
Through caverns measureless to man

If your version of grep does not allow multiple selections, then you could consider creating a temporary file with the contents of all the pattern files, and then using that single file as the pattern source ... cheers, drl

[Sangal-Arun]

Hi.

If I understand your question, you have more than one pattern file that you would like to have considered in one call to grep.

Apologies for the long post, but this seems to work for me:

#!/usr/bin/env sh

# @(#) s1       Demonstrate selection of multiple pattern files, grep.

#  ____
# /
# |   Infrastructure BEGIN

echo
set -o nounset

debug=":"
debug="echo"

## The shebang using "env" line is designed for portability. For
#  higher security, use:
#
#  #!/bin/sh -

## Use local command version for the commands in this demonstration.

set +o nounset
echo "(Versions displayed with local utility \"version\")"
version >/dev/null 2>&1 && version =o $(_eat $0 $1) grep
set -o nounset

echo

FILE=${1-data1}
echo " Input file $FILE:"
cat $FILE

PAT1=a
echo
echo " Pattern file $PAT1:"
cat $PAT1

PAT2=b
echo
echo " Pattern file $PAT2:"
cat $PAT2

# |   Infrastructure END
# \
#  ---

echo
echo " Results from processing:"
grep -f $PAT1 -f $PAT2 $FILE

exit 0

Producing:

% ./s1

(Versions displayed with local utility "version")
Linux 2.6.11-x1
GNU bash, version 2.05b.0(1)-release (i386-pc-linux-gnu)
grep (GNU grep) 2.5.1

 Input file data1:
Now is the time
for all good men
to come to the aid
of their country.

In Xanadu did Kubla Khan
A stately pleasure-dome decree:
Where Alph, the sacred river, ran
Through caverns measureless to man
Down to a sunless sea.

 Pattern file a:
all
decree

 Pattern file b:
country
cavern

 Results from processing:
for all good men
of their country.
A stately pleasure-dome decree:
Through caverns measureless to man

If your version of grep does not allow multiple selections, then you could consider creating a temporary file with the contents of all the pattern files, and then using that single file as the pattern source ... cheers, drl

Here comes DRL...thanks a lot. Found last night that we have to use -f n no. of times ...for n pattern files.