Mdthbs

Is there any practical application for performing a double Fourier transform? ...or an inverse Fourier transform on a time-domain input?

How would you identify when an object in a Lissajous orbit needs station keeping?

How do I get a decreased-by-one x in a foreach loop?

Couple of slangs I've heard when watching anime

Is a player able to change alignment midway through an adventure?

Why in most German places is the church the tallest building?

Handling Disruptive Student on the Autistic Spectrum

What is the difference between Major and Minor Bug?

Did a flight controller ever answer Flight with a no-go?

Can a Rogue PC teach an NPC to perform Sneak Attack?

Examples of topos that are not ordinary spaces

Anatomically Correct Whomping Willow

How to find out the average duration of the peer-review process for a given journal?

An interview question: What's the number of String objects being created?

Is there any music source code for sound chips?

How do I get toddlers to stop asking for food every hour?

How should I face my manager if I make a mistake because a senior coworker explained something incorrectly to me?

Why would an IIS hosted site prompt for AD account credential if accessed through a hostname or IP, but not through servername?

Algorithms vs LP or MIP

How is the idea of "two people having a heated argument" idiomatically expressed in German?

Why did Khan ask Admiral James T. Kirk about Project Genesis?

Why did this happen to Thanos's ships at the end of "Avengers: Endgame"?

Is “I am getting married with my sister” ambiguous?

Is "The life is beautiful" incorrect or just very non-idiomatic?

Grep quotation mark inside quotation mark

grep on a variableHow to grep -v and also exclude the next line after the match?Show ratio for all available resolutionsGrep lines before after if value of a string is greater than zeroUnexpected grep behaviour when using command substituitonHow to search for all tabs between two quotation marks with grep / egrep

.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ margin-bottom:0;
}

-1

example.txt

alias znm="base64"

alias asu="sed 's/.{4}/&™/g'"

alias mmk="sed 's/(.{4})™/1/g'"

alias mmk="sed 's/(.{8})™/1/g'"

Desired output:

alias asu="sed 's/.{4}/&™/g'"

But it's get error when i tried this

grep -wo "alias asu="sed 's/.{4}/&™/g'"" example.txt

How to do it correctly?

bash shell text-processing

share|improve this question

edited yesterday

IISomeOneII

asked yesterday

IISomeOneIIIISomeOneII

13211 silver badge1313 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Why not just grep asu example.txt or awk 'NR==2' example.txt?
  
  – Nasir Riley
  yesterday
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  The first command with grep will give you that entire line which is your desired output. Have you tried using it?
  
  – Nasir Riley
  yesterday
  
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  No, you don't. The command that I just gave you returns the output that you want. You are complicating something that's very simple.
  
  – Nasir Riley
  yesterday
  
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @NasirRiley It would output whatever is on the second line, no matter what that was. I'm imagining that they want to test whether the particular alias is in the file (with an exact alias definition).
  
  – Kusalananda♦
  yesterday
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  @Kusalananda I understand that but the grep command gives the expected output as they confirmed. If they wanted that exact alias then that should have been specified in the question. With the way that it's written, that information is being obfuscated.
  
  – Nasir Riley
  yesterday
  
  
  

  
  
  
  

 | 
show 5 more comments

-1

example.txt

alias znm="base64"

alias asu="sed 's/.{4}/&™/g'"

alias mmk="sed 's/(.{4})™/1/g'"

alias mmk="sed 's/(.{8})™/1/g'"

Desired output:

alias asu="sed 's/.{4}/&™/g'"

But it's get error when i tried this

grep -wo "alias asu="sed 's/.{4}/&™/g'"" example.txt

How to do it correctly?

bash shell text-processing

share|improve this question

edited yesterday

IISomeOneII

asked yesterday

IISomeOneIIIISomeOneII

13211 silver badge1313 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Why not just grep asu example.txt or awk 'NR==2' example.txt?
  
  – Nasir Riley
  yesterday
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  The first command with grep will give you that entire line which is your desired output. Have you tried using it?
  
  – Nasir Riley
  yesterday
  
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  No, you don't. The command that I just gave you returns the output that you want. You are complicating something that's very simple.
  
  – Nasir Riley
  yesterday
  
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @NasirRiley It would output whatever is on the second line, no matter what that was. I'm imagining that they want to test whether the particular alias is in the file (with an exact alias definition).
  
  – Kusalananda♦
  yesterday
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  @Kusalananda I understand that but the grep command gives the expected output as they confirmed. If they wanted that exact alias then that should have been specified in the question. With the way that it's written, that information is being obfuscated.
  
  – Nasir Riley
  yesterday
  
  
  

  
  
  
  

 | 
show 5 more comments

example.txt

alias znm="base64"

alias asu="sed 's/.{4}/&™/g'"

alias mmk="sed 's/(.{4})™/1/g'"

alias mmk="sed 's/(.{8})™/1/g'"

Desired output:

alias asu="sed 's/.{4}/&™/g'"

But it's get error when i tried this

grep -wo "alias asu="sed 's/.{4}/&™/g'"" example.txt

How to do it correctly?

bash shell text-processing

share|improve this question

edited yesterday

IISomeOneII

asked yesterday

IISomeOneIIIISomeOneII

13211 silver badge1313 bronze badges

alias znm="base64"

alias asu="sed 's/.{4}/&™/g'"

alias mmk="sed 's/(.{4})™/1/g'"

alias mmk="sed 's/(.{8})™/1/g'"

alias asu="sed 's/.{4}/&™/g'"

grep -wo "alias asu="sed 's/.{4}/&™/g'"" example.txt

share|improve this question

edited yesterday

IISomeOneII

asked yesterday

IISomeOneIIIISomeOneII

13211 silver badge1313 bronze badges

share|improve this question

edited yesterday

IISomeOneII

asked yesterday

IISomeOneIIIISomeOneII

13211 silver badge1313 bronze badges

asked yesterday

IISomeOneIIIISomeOneII

13211 silver badge1313 bronze badges

asked yesterday

IISomeOneIIIISomeOneII

13211 silver badge1313 bronze badges

1 Answer
1

active

oldest

votes

1

grep -Fx -f /dev/stdin example.txt <<'PATTERN'

alias asu="sed 's/.{4}/&™/g'"

PATTERN

This avoids the issues that you're having with the quotes and regular expression characters and passes the pattern as is into grep on standard input. The grep utility reads the pattern from standard input because we've asked it, with -f /dev/stdin, to do that (on Android, you may instead use -f /dev/fd/0).

The -F uses the pattern as a string instead of as a regular expression, and -x ensures that we only matches lines that matches the pattern completely (as if the pattern was anchored to both start and finish of the line).

Using this as a test for whether that particular alias is in the file:

if grep -q -Fx -f /dev/stdin example.txt; then

    echo the alias is there

else

    echo the alias is not there

fi <<'PATTERN'

alias asu="sed 's/.{4}/&™/g'"

PATTERN

---

Your command,

grep -wo "alias asu="sed 's/.{4}/&™/g'"" example.txt

is really calling grep with a pattern and two filenames:

• 
  "alias asu="sed is the pattern (really, a regular expression, as you don't use -F).


• 
  's/.{4}/&™/g'"" is the first filename since the shell will break the string on the unquoted space.


• 
  example.txt is the second filename.

You could obviously make sure to quote all special characters and quotes, but using a here-document is slightly easier as you don't have to modify the pattern at all.

share|improve this answer

edited yesterday

answered yesterday

Kusalananda♦Kusalananda

161k1818 gold badges318318 silver badges505505 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  grep: /dev/stdin: No such file or directory | It's not work, am i doing it wrong
  
  – IISomeOneII
  yesterday
  
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @IISomeOneII Oh, that's interesting! Are you on an AIX system? What does uname -a say?
  
  – Kusalananda♦
  yesterday
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Linux localhost 3.18.31-perf-g653a83a #1 SMP PREEMPT Mon Jan 28 10:05:53 WIB 2019 aarch64 Android
  
  – IISomeOneII
  yesterday
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @IISomeOneII Hmmm... Could you try with /proc/self/fd/0 in place of /dev/stdin? I'm not aware of how Linux works on Android devices. I'm testing this on Ubuntu Linux and OpenBSD, and both provides /dev/stdin. The other possibility is that you mistyped something.
  
  – Kusalananda♦
  yesterday
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @IISomeOneII Yes, /dev/fd/0 or /proc/self/fd/0 should work on Android.
  
  – Kusalananda♦
  yesterday
  

  
  
  
  

 | 
show 1 more comment

Your Answer

StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "106"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);

StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});

function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});


}
});

draft saved

draft discarded

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Sign up using Google

Sign up using Facebook

Sign up using Email and Password

Post as a guest

Name

Email

Required, but never shown

StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f536781%2fgrep-quotation-mark-inside-quotation-mark%23new-answer', 'question_page');
}
);

Post as a guest

Name

Email

Required, but never shown

1

grep -Fx -f /dev/stdin example.txt <<'PATTERN'

alias asu="sed 's/.{4}/&™/g'"

PATTERN

This avoids the issues that you're having with the quotes and regular expression characters and passes the pattern as is into grep on standard input. The grep utility reads the pattern from standard input because we've asked it, with -f /dev/stdin, to do that (on Android, you may instead use -f /dev/fd/0).

The -F uses the pattern as a string instead of as a regular expression, and -x ensures that we only matches lines that matches the pattern completely (as if the pattern was anchored to both start and finish of the line).

Using this as a test for whether that particular alias is in the file:

if grep -q -Fx -f /dev/stdin example.txt; then

    echo the alias is there

else

    echo the alias is not there

fi <<'PATTERN'

alias asu="sed 's/.{4}/&™/g'"

PATTERN

---

Your command,

grep -wo "alias asu="sed 's/.{4}/&™/g'"" example.txt

is really calling grep with a pattern and two filenames:

• 
  "alias asu="sed is the pattern (really, a regular expression, as you don't use -F).


• 
  's/.{4}/&™/g'"" is the first filename since the shell will break the string on the unquoted space.


• 
  example.txt is the second filename.

You could obviously make sure to quote all special characters and quotes, but using a here-document is slightly easier as you don't have to modify the pattern at all.

share|improve this answer

edited yesterday

answered yesterday

Kusalananda♦Kusalananda

161k1818 gold badges318318 silver badges505505 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  grep: /dev/stdin: No such file or directory | It's not work, am i doing it wrong
  
  – IISomeOneII
  yesterday
  
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @IISomeOneII Oh, that's interesting! Are you on an AIX system? What does uname -a say?
  
  – Kusalananda♦
  yesterday
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Linux localhost 3.18.31-perf-g653a83a #1 SMP PREEMPT Mon Jan 28 10:05:53 WIB 2019 aarch64 Android
  
  – IISomeOneII
  yesterday
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @IISomeOneII Hmmm... Could you try with /proc/self/fd/0 in place of /dev/stdin? I'm not aware of how Linux works on Android devices. I'm testing this on Ubuntu Linux and OpenBSD, and both provides /dev/stdin. The other possibility is that you mistyped something.
  
  – Kusalananda♦
  yesterday
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @IISomeOneII Yes, /dev/fd/0 or /proc/self/fd/0 should work on Android.
  
  – Kusalananda♦
  yesterday
  

  
  
  
  

 | 
show 1 more comment

1

grep -Fx -f /dev/stdin example.txt <<'PATTERN'

alias asu="sed 's/.{4}/&™/g'"

PATTERN

This avoids the issues that you're having with the quotes and regular expression characters and passes the pattern as is into grep on standard input. The grep utility reads the pattern from standard input because we've asked it, with -f /dev/stdin, to do that (on Android, you may instead use -f /dev/fd/0).

The -F uses the pattern as a string instead of as a regular expression, and -x ensures that we only matches lines that matches the pattern completely (as if the pattern was anchored to both start and finish of the line).

Using this as a test for whether that particular alias is in the file:

if grep -q -Fx -f /dev/stdin example.txt; then

    echo the alias is there

else

    echo the alias is not there

fi <<'PATTERN'

alias asu="sed 's/.{4}/&™/g'"

PATTERN

---

Your command,

grep -wo "alias asu="sed 's/.{4}/&™/g'"" example.txt

is really calling grep with a pattern and two filenames:

• 
  "alias asu="sed is the pattern (really, a regular expression, as you don't use -F).


• 
  's/.{4}/&™/g'"" is the first filename since the shell will break the string on the unquoted space.


• 
  example.txt is the second filename.

You could obviously make sure to quote all special characters and quotes, but using a here-document is slightly easier as you don't have to modify the pattern at all.

share|improve this answer

edited yesterday

answered yesterday

Kusalananda♦Kusalananda

161k1818 gold badges318318 silver badges505505 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  grep: /dev/stdin: No such file or directory | It's not work, am i doing it wrong
  
  – IISomeOneII
  yesterday
  
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @IISomeOneII Oh, that's interesting! Are you on an AIX system? What does uname -a say?
  
  – Kusalananda♦
  yesterday
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Linux localhost 3.18.31-perf-g653a83a #1 SMP PREEMPT Mon Jan 28 10:05:53 WIB 2019 aarch64 Android
  
  – IISomeOneII
  yesterday
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @IISomeOneII Hmmm... Could you try with /proc/self/fd/0 in place of /dev/stdin? I'm not aware of how Linux works on Android devices. I'm testing this on Ubuntu Linux and OpenBSD, and both provides /dev/stdin. The other possibility is that you mistyped something.
  
  – Kusalananda♦
  yesterday
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @IISomeOneII Yes, /dev/fd/0 or /proc/self/fd/0 should work on Android.
  
  – Kusalananda♦
  yesterday
  

  
  
  
  

 | 
show 1 more comment

grep -Fx -f /dev/stdin example.txt <<'PATTERN'

alias asu="sed 's/.{4}/&™/g'"

PATTERN

This avoids the issues that you're having with the quotes and regular expression characters and passes the pattern as is into grep on standard input. The grep utility reads the pattern from standard input because we've asked it, with -f /dev/stdin, to do that (on Android, you may instead use -f /dev/fd/0).

The -F uses the pattern as a string instead of as a regular expression, and -x ensures that we only matches lines that matches the pattern completely (as if the pattern was anchored to both start and finish of the line).

Using this as a test for whether that particular alias is in the file:

if grep -q -Fx -f /dev/stdin example.txt; then

    echo the alias is there

else

    echo the alias is not there

fi <<'PATTERN'

alias asu="sed 's/.{4}/&™/g'"

PATTERN

---

Your command,

grep -wo "alias asu="sed 's/.{4}/&™/g'"" example.txt

is really calling grep with a pattern and two filenames:

• 
  "alias asu="sed is the pattern (really, a regular expression, as you don't use -F).


• 
  's/.{4}/&™/g'"" is the first filename since the shell will break the string on the unquoted space.


• 
  example.txt is the second filename.

You could obviously make sure to quote all special characters and quotes, but using a here-document is slightly easier as you don't have to modify the pattern at all.

share|improve this answer

edited yesterday

answered yesterday

Kusalananda♦Kusalananda

161k1818 gold badges318318 silver badges505505 bronze badges

grep -Fx -f /dev/stdin example.txt <<'PATTERN'

alias asu="sed 's/.{4}/&™/g'"

PATTERN

if grep -q -Fx -f /dev/stdin example.txt; then

    echo the alias is there

else

    echo the alias is not there

fi <<'PATTERN'

alias asu="sed 's/.{4}/&™/g'"

PATTERN

grep -wo "alias asu="sed 's/.{4}/&™/g'"" example.txt

share|improve this answer

edited yesterday

answered yesterday

Kusalananda♦Kusalananda

161k1818 gold badges318318 silver badges505505 bronze badges

answered yesterday

Kusalananda♦Kusalananda

161k1818 gold badges318318 silver badges505505 bronze badges

answered yesterday

Kusalananda♦Kusalananda

161k1818 gold badges318318 silver badges505505 bronze badges