From Newsgroup: alt.os.linux.ubuntu


The following ...

grep -e pattern1 -e pattern2 wget_output_file.txt

is NOT giving the result that I'm looking for, which is BOTH patterns
must be in the file.
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From Newsgroup: alt.os.linux.ubuntu

On Thu, 3/13/2025 2:17 PM, Adam wrote:

The following ...

grep -e pattern1 -e pattern2 wget_output_file.txt

is NOT giving the result that I'm looking for, which is BOTH patterns must be in the file.

"The egrep variant supports an extended regular expression syntax added by Alfred Aho
after Ken Thompson's original regular expression implementation.[12]

The "fgrep" variant searches for any of a list of fixed strings using
the Aho–Corasick string matching algorithm."

*******

sample.txt
----------
I am a cat
I am a dog
I am a cat or a dog
I am an elephant

(stdout)

$ egrep "cat|dog" sample.txt
I am a cat
I am a dog
I am a cat or a dog

"If at first you don't grep, try try again... with a egrep or a fgrep" :-)

It's a good thing these are documented.

Paul
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From Newsgroup: alt.os.linux.ubuntu

On 03/13/2025 12:16 PM, Paul wrote:

On Thu, 3/13/2025 2:17 PM, Adam wrote:

The following ...

grep -e pattern1 -e pattern2 wget_output_file.txt

is NOT giving the result that I'm looking for, which is BOTH patterns must be in the file.

"The egrep variant supports an extended regular expression syntax added by Alfred Aho
after Ken Thompson's original regular expression implementation.[12]

The "fgrep" variant searches for any of a list of fixed strings using
the Aho–Corasick string matching algorithm."

*******

sample.txt
----------
I am a cat
I am a dog
I am a cat or a dog
I am an elephant

(stdout)

$ egrep "cat|dog" sample.txt
I am a cat
I am a dog
I am a cat or a dog

"If at first you don't grep, try try again... with a egrep or a fgrep" :-)

It's a good thing these are documented.

Paul

I'm looking for AND (not OR) operator. So, both patterns must be in the
file (not line) or FALSE is returned.

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From Newsgroup: alt.os.linux.ubuntu

Il Thu, 13 Mar 2025 12:56:42 -0700, Adam ha scritto:

I'm looking for AND (not OR) operator. So, both patterns must be in the
file (not line) or FALSE is returned.

$ ( grep -l pattern1 file | xargs grep -l pattern2 ) || false

You can do it better. Read the manual of the involved commands, if you
like.
--
Bye, Lem
Talis erit dies qualem egeris
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From Newsgroup: alt.os.linux.ubuntu

On Thu, 3/13/2025 3:56 PM, Adam wrote:

On 03/13/2025 12:16 PM, Paul wrote:

On Thu, 3/13/2025 2:17 PM, Adam wrote:

The following ...

grep -e pattern1 -e pattern2 wget_output_file.txt

is NOT giving the result that I'm looking for, which is BOTH patterns must be in the file.

"The egrep variant supports an extended regular expression syntax added by Alfred Aho
  after Ken Thompson's original regular expression implementation.[12]

  The "fgrep" variant searches for any of a list of fixed strings using
  the Aho–Corasick string matching algorithm."

*******

sample.txt
----------
I am a cat
I am a dog
I am a cat or a dog
I am an elephant

(stdout)

$ egrep "cat|dog" sample.txt
I am a cat
I am a dog
I am a cat or a dog

"If at first you don't grep, try try again... with a egrep or a fgrep" :-) >>
It's a good thing these are documented.

     Paul

I'm looking for AND (not OR) operator. So, both patterns must be in the file (not line) or FALSE is returned.

sample.txt
----------

I am a cat
I am a dog
I am a cat and a dog
I am a dog and a cat
I am an elephant

I had to use CoPilot, as my crafting experiments all failed.

$ egrep 'cat.*dog|dog.*cat' sample.txt # cat followed by dog or dog followed by cat
I am a cat and a dog
I am a dog and a cat
$

Note that, this needs to be rigorously tested.
Just based on my failures before asking CoPilot,
you can't just assume this actually works...

I am a cat
I am a dog
I am a cat and a dog
I am a dog and a cat
I am a dog dog and a cat
I am a dog dog and a cat dog
I am a dog dog and a cat cat
I am a dog cat and a dog cat
I am a dog cat and a cat dog
I am an elephant

$ egrep 'cat.*dog|dog.*cat' sample.txt
I am a cat and a dog
I am a dog and a cat
I am a dog dog and a cat
I am a dog dog and a cat dog
I am a dog dog and a cat cat
I am a dog cat and a dog cat
I am a dog cat and a cat dog
$

I would imagine this technique rapidly runs out of legs.

Paul
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From Newsgroup: alt.os.linux.ubuntu

On 03/13/2025 01:44 PM, Lem Novantotto wrote:

Il Thu, 13 Mar 2025 12:56:42 -0700, Adam ha scritto:

I'm looking for AND (not OR) operator. So, both patterns must be in the
file (not line) or FALSE is returned.

$ ( grep -l pattern1 file | xargs grep -l pattern2 ) || false

You can do it better. Read the manual of the involved commands, if you
like.

Thanks, your post led me to...

How can I search a file to see if it contains multiple patterns anywhere
in the file? https://askubuntu.com/questions/1501703/how-can-i-search-a-file-to-see-if-it-contains-multiple-patterns-anywhere-in-the
======================================================================== waltinator's answer...

It can be done using multiple grep commands. Read man grep xargs, and do something like

grep -l 'pattern1' -f filelist | \
xargs grep -l 'pattern2` | \
xargs grep -l 'pattern3'

The first grep produces a list of files containing the first pattern.
The second (xargs grep) searches for the second pattern in the files containing the first pattern. ========================================================================


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From Newsgroup: alt.os.linux.ubuntu

On 2025-03-13, Adam wrote:

On 03/13/2025 12:16 PM, Paul wrote:

On Thu, 3/13/2025 2:17 PM, Adam wrote:

The following ...

grep -e pattern1 -e pattern2 wget_output_file.txt

is NOT giving the result that I'm looking for, which is BOTH
patterns must be in the file.

"The egrep variant supports an extended regular expression syntax
added by Alfred Aho after Ken Thompson's original regular expression
implementation.[12]

The "fgrep" variant searches for any of a list of fixed strings
using the Aho–Corasick string matching algorithm."

*******

sample.txt
----------
I am a cat
I am a dog
I am a cat or a dog
I am an elephant

(stdout)

$ egrep "cat|dog" sample.txt
I am a cat
I am a dog
I am a cat or a dog

"If at first you don't grep, try try again... with a egrep or a fgrep" :-) >>
It's a good thing these are documented.

Paul

I'm looking for AND (not OR) operator. So, both patterns must be in the
file (not line) or FALSE is returned.

So you'll need something like this, or a different language.

if grep -q PATTERN1 theFile; then
if grep -q PATTERN2 theFile; then
printf "Both patterns contained in file.\n"
else
printf "Pattern2 missing from file.\n"
fi
else
printf "Pattern1 missing from file.\n"
fi


could probably be cleaned up a bit, but it'll do what you want.
--
|_|O|_|
|_|_|O| Github: https://github.com/dpurgert
|O|O|O| PGP: DDAB 23FB 19FA 7D85 1CC1 E067 6D65 70E5 4CE7 2860
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From Newsgroup: alt.os.linux.ubuntu

On Thu, 13 Mar 2025 14:38:45 -0700, Adam wrote:

On 03/13/2025 01:44 PM, Lem Novantotto wrote:

Il Thu, 13 Mar 2025 12:56:42 -0700, Adam ha scritto:

I'm looking for AND (not OR) operator. So, both patterns must be in
the file (not line) or FALSE is returned.

$ ( grep -l pattern1 file | xargs grep -l pattern2 ) || false

You can do it better. Read the manual of the involved commands, if you
like.

Thanks, your post led me to...

How can I search a file to see if it contains multiple patterns anywhere
in the file? https://askubuntu.com/questions/1501703/how-can-i-search-a-file-to-see-

if-it-contains-multiple-patterns-anywhere-in-the

======================================================================== waltinator's answer...

It can be done using multiple grep commands. Read man grep xargs, and do something like

grep -l 'pattern1' -f filelist | \
xargs grep -l 'pattern2` | \
xargs grep -l 'pattern3'

The first grep produces a list of files containing the first pattern.
The second (xargs grep) searches for the second pattern in the files containing the first pattern. ========================================================================

As a variation on that theme:

find . -name "*.c" | xargs grep foobar

Not what you asked for but handy.

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From Newsgroup: alt.os.linux.ubuntu

Adam wrote:

On 03/13/2025 12:16 PM, Paul wrote:

On Thu, 3/13/2025 2:17 PM, Adam wrote:

The following ...

grep -e pattern1 -e pattern2 wget_output_file.txt

is NOT giving the result that I'm looking for, which is BOTH patterns
must be in the file.

"The egrep variant supports an extended regular expression syntax
added by Alfred Aho
  after Ken Thompson's original regular expression implementation.[12]

  The "fgrep" variant searches for any of a list of fixed strings using
  the Aho–Corasick string matching algorithm."

*******

sample.txt
----------
I am a cat
I am a dog
I am a cat or a dog
I am an elephant

(stdout)

$ egrep "cat|dog" sample.txt
I am a cat
I am a dog
I am a cat or a dog

"If at first you don't grep, try try again... with a egrep or a fgrep"
:-)

It's a good thing these are documented.

     Paul

I'm looking for AND (not OR) operator. So, both patterns must be in the
file (not line) or FALSE is returned.

In this instance I just use cat:

(stdout)
$ cat sample.txt | grep cat | grep dog
I am a cat or a dog

BTW note on egrep deprecation:

<https://www.phoronix.com/news/GNU-Grep-3.8-Stop-egrep-fgrep>
--
Take care,

Jonathan
-------------------
LITTLE WORKS STUDIO
http://www.LittleWorksStudio.com
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From Newsgroup: alt.os.linux.ubuntu

On 14 Mar 2025 02:58:58 GMT, rbowman wrote:

On Thu, 13 Mar 2025 14:38:45 -0700, Adam wrote:

On 03/13/2025 01:44 PM, Lem Novantotto wrote:

Il Thu, 13 Mar 2025 12:56:42 -0700, Adam ha scritto:

I'm looking for AND (not OR) operator. So, both patterns must be in
the file (not line) or FALSE is returned.

$ ( grep -l pattern1 file | xargs grep -l pattern2 ) || false

You can do it better. Read the manual of the involved commands, if you
like.

Thanks, your post led me to...

How can I search a file to see if it contains multiple patterns anywhere
in the file?
https://askubuntu.com/questions/1501703/how-can-i-search-a-file-to-see-

if-it-contains-multiple-patterns-anywhere-in-the

========================================================================
waltinator's answer...

It can be done using multiple grep commands. Read man grep xargs, and do
something like

grep -l 'pattern1' -f filelist | \
xargs grep -l 'pattern2` | \
xargs grep -l 'pattern3'

The first grep produces a list of files containing the first pattern.
The second (xargs grep) searches for the second pattern in the files
containing the first pattern.
========================================================================

As a variation on that theme:

find . -name "*.c" | xargs grep foobar

Not what you asked for but handy.

_IF_ your 2 text strings occur in a specific sequence

$ grep "STRING1.*STRING2" FILE.NM

Jonesy
--
Marvin L Jones | Marvin | W3DHJ | linux
Pueblo, Colorado | @ | Jonesy | FreeBSD __
38.238N 104.547W | jonz.net | DM78rf | SK
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From Newsgroup: alt.os.linux.ubuntu

Adam wrote:

On 03/13/2025 01:44 PM, Lem Novantotto wrote:

Il Thu, 13 Mar 2025 12:56:42 -0700, Adam ha scritto:

I'm looking for AND (not OR) operator. So, both patterns must be in the
file (not line) or FALSE is returned.

$ ( grep -l pattern1 file | xargs grep -l pattern2 ) || false

You can do it better. Read the manual of the involved commands, if you
like.

Thanks, your post led me to...

How can I search a file to see if it contains multiple patterns anywhere
in the file? https://askubuntu.com/questions/1501703/how-can-i-search-a-file-to-see-if-it-contains-multiple-patterns-anywhere-in-the

======================================================================== waltinator's answer...

It can be done using multiple grep commands. Read man grep xargs, and do something like

grep -l 'pattern1' -f filelist | \
    xargs grep -l 'pattern2` | \
    xargs grep -l 'pattern3'

The first grep produces a list of files containing the first pattern.
The second (xargs grep) searches for the second pattern in the files containing the first pattern. ========================================================================

If there's a possibility that filenames might contain spaces (or other whitespace characters), it's safer to tell grep to separate each file in
its output with null characters (instead of the default line break) and
xargs to expect null as a separator in its input (instead of the default whitespace):

grep -l 'pattern1' -f filelist -Z | \
xargs -0 grep -l 'pattern2' -Z | \
xargs -0 grep -l 'pattern3'

I've left the "-Z" off the last grep, so that it outputs to the terminal
one file per line. That might be confusing if filenames contain line
break characters, which is allowed, but that would be unusual and if it
does happen a human reader can probably work it out.
--
Mark.
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From Newsgroup: alt.os.linux.ubuntu

On Fri, 14 Mar 2025 09:30:15 -0400, Jonathan N. Little wrote:

BTW note on egrep deprecation:

grep -E for egrep, grep -F for fgrep, it’s all grep now.
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From Newsgroup: alt.os.linux.ubuntu

On 3/13/2025 7:58 PM, rbowman wrote:
[redacted]

As a variation on that theme:

find . -name "*.c" | xargs grep foobar

Not what you asked for but handy.

For your specific example

grep -r --include='*.c' foobar

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From Newsgroup: alt.os.linux.ubuntu

On 3/17/2025 8:51 PM, red floyd wrote:

On 3/13/2025 7:58 PM, rbowman wrote:
[redacted]

As a variation on that theme:

find . -name "*.c" | xargs grep foobar

Not what you asked for but handy.

For your specific example

grep -r --include='*.c' foobar

CURSES...

grep -r --include='*.c' foobar .

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