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Editor to share with you how to use findstr in cmd to find strings in files. I believe most people don't know much about it, so share this article for your reference. I hope you will gain a lot after reading this article. Let's learn about it together.

Look for a string in the file.

The code is as follows:

FINDSTR [/ B] [/ E] [/ L] [/ R] [/ S] [/ I] [/ X] [/ V] [/ N] [/ M] [/ O] [/ P] [/ F:file]

[/ C:string] [/ G:file] [/ D:dir list] [/ A:color attributes] [/ OFF[LINE]]

Strings [[drive:] [path] filename [...]]

/ B begins the pairing mode on a line.

/ E pairing mode at the end of a line.

/ L uses the search string by word.

/ R uses the search string as a regular expression.

/ S searches the current directory and all subdirectories for matching files.

/ I specifies that searches are case-insensitive.

/ X prints lines that match exactly.

/ V prints only lines that do not contain matches.

/ N prints the number of lines before each line that matches.

/ M if the file contains a match, only its file name is printed.

/ O prints the character offset before each matching line.

/ P A file with slightly unprintable characters.

/ OFF [LINE] does not skip files with offline property sets.

/ A:attr specifies the color attribute with hexadecimal digits. Please see "color /?"

/ F:file reads the list of files from the specified file (/ on behalf of the console).

/ C:string uses the specified string as the text search string.

/ G:file gets the search string from the specified file. (/ represents the console).

/ D:dir finds a list of directories delimited by semicolons

The text that strings is looking for.

[drive:] [path] filename

Specify the file to find.

Unless the parameter has a / C prefix, use a space to separate the search string.

For example: 'FINDSTR "hello there" x.y' look for "hello" or "x.y" in the file x.y

"there". FINDSTR / C: "hello there" x.y' file x.y search

"hello there".

Quick reference to regular expressions:

. Wildcards: any character

* repetition: zero or more times of previous characters or classes

^ line position: the beginning of the line

Line position: the end of the line

[class] character class: any character in the character set

[^ class] complement class: any character that is not in the character set

[xmury] range: any character within a specified range

\ x Escape: text usage of metacharacter x

\ word position: the end of the word

For more information on common FINDSTR expressions, see the online Command reference.

In this help message, I replaced all "general expressions" with "regular expressions" (it's all the fault of machine translation).

Command summary:

Findstr, all English find string, meaning "find string"

/ b, all English begin, meaning "start"

/ e, all English end, meaning "end"

/ lgraine literally, which means "literally"; extends to "de-regular expression".

/ rmagnetic regular, which means "regular"; extends to "regular expression".

/ srecoery subdirectory, which means "subdirectory"

/ iWriting, which means "ignore", and extends to "ignore case"

/ x exactly, which means "exactly"; extends to "perfect match"; (at first it means not this word, but HAT is really smart-the abbreviation e is because there is an abbreviation for end, so the second letter x is the abbreviation).

/ vjingrat, which means "reverse, reverse" (thanks to the word "doupip")

/ n, all English number, meaning "number"; extended as "line number"

/ m recently merely, which means "just"

/ other offset, which means "offset"

/ pforce print, which means "print"

/ off [line], meaning "offline file"

/ a minute attribute, meaning "attribute"

/ fjore file, which means "file"

/ ccent case, which means "add up a few words"; extends to "match all words"

/ gget, which means "to get"

/ dforce directory, which means "directory"

Class, class.

Thank you HAT for providing the word.

Thank you, weichengxiehou.

The parameter details section 13-14 is copied from the weichengxiehou post (now that it is ready-made, don't worry about it), the original post address.

Detailed description of parameters:

Learning findstr requires a lot of practical experience, so you need to create some new txt text for testing.

The content of a.txt (the content of a.txt will be modified many times later, please note! ):

The code is as follows:

Hello World

Hello Boy

Hello, good man.

Goodbye!

1. The simplest application: find the specified string in the specified text

Code:

The code is as follows:

Findstr "hello" a.txt

Results:

The code is as follows:

C:\ Users\ helloworld\ Desktop > findstr "hello" a.txt

Hello, good man.

Code:

The code is as follows:

Findstr "Hello" a.txt

Results:

The code is as follows:

C:\ Users\ helloworld\ Desktop > findstr "Hello" a.txt

Hello World

Hello Boy

It can be seen here

Findstr is case-sensitive by default (like the find command)-finding hello will not result in Hello, and vice versa.

How to make it case-insensitive?

Use the / I parameter!

For example:

The code is as follows:

C:\ Users\ helloworld\ Desktop > findstr / I "Hello" a.txt

Hello World

Hello Boy

Hello, good man.

two。 Displays the specific line of the text for the character you are looking for

Code: C:\ Users\ helloworld\ Desktop > findstr / n / I "hello" a.txt

Effect:

The code is as follows:

1:Hello World

2:Hello Boy

3:hello, good man.

The colon (:) in the displayed result is in English format, so you should pay attention to it when you extract it with for!

Here you can compare the / n parameter of the find command:

Code:

The code is as follows:

C:\ Users\ helloworld\ Desktop > find / n "hello" a.txt

Effect:-A.TXT

[3] hello, good man.

Colons (:) and brackets ([]), this is the difference, be sure to pay attention to when writing code.

3. Find text that contains the specified character

Code:

The code is as follows:

C:\ Users\ helloworld\ Desktop > findstr / m / I "hello" * .txt

Effect:

The code is as follows:

1.txt

A.txt

The classes in 1.txt contain the following: unless the parameter has a / C prefix, use a space to separate the search string.

For example:

The code is as follows:

'FINDSTR "hello there" x.y 'look for "hello" or "x.y" in the file x.y

"there". FINDSTR / C: "hello there" x.y' file x.y search

"hello there".

[code]

Because the / m parameter is added, only the file names that contain the specified characters are listed.

4. Find a line of text that begins or ends with a specified character

The biggest difference between this function and the previous introduction is that it involves "metacharacters". If you don't understand what metacharacters are, you don't have to worry about learning this section well. It's like you don't understand what "water" is, and it won't affect drinking water.

A.txt content:

[code]

Good hello

Hello, hello world.

Hello World

Hello Boy

Hello, good man.

Goodbye!

How do I find lines that start with hello (ignore case)?

There are two ways:

①. / b parameter

Code:

The code is as follows:

C:\ Users\ helloworld\ Desktop > findstr / b / I "hello" a.txt

Effect:

The code is as follows:

Hello World

Hello Boy

Hello, good man.

Good hello and Hello hello world, both lines are not shown because hello is not at the beginning of the line.

②. ^ character

The ^ here is not an escape character, but "where the match line begins" in the regular expression.

Code:

The code is as follows:

C:\ Users\ helloworld\ Desktop > findstr / I "^ hello" a.txt

Effect:

The code is as follows:

Hello World

Hello Boy

Hello, good man.

After learning to find lines that start with a specified character, let's learn to find a line that ends with a specified character.

How do I find lines that end in hello (ignore case)?

There are also two ways:

①. / e parameter

Code:

The code is as follows:

C:\ Users\ helloworld\ Desktop > findstr / e / I "hello" a.txt

Results:

The code is as follows:

Good hello

Only "good hello" is displayed, because although the other lines have "hello", none of them ends with "hello".

②. $symbol

Code:

The code is as follows:

C:\ Users\ helloworld\ Desktop > findstr / I "hello$" a.txt

Results: good hello

So far, we have learned the metacharacters of two regular expressions: ^ and $(the / b and / e parameters corresponding to their functions, respectively).

5. Find a line that exactly matches the specified character

First, modify the contents of a.txt:

The code is as follows:

Hello

Hello hello

Good hello

Hello, hello world.

Hello World

Hello Boy

Hello, good man.

Goodbye!

Children's shoes who know how to follow examples may try the following code:

The code is as follows:

C:\ Users\ helloworld\ Desktop > findstr / n / I "^ hello$" a.txt

The result makes you happy: 1:hello

In fact, in addition to this method, the findstr command also provides a / x parameter to find exact matching rows.

Code:

The code is as follows:

C:\ Users\ helloworld\ Desktop > findstr / n / I / x "hello" a.txt

Results:

The code is as follows:

1:hello

6. What happens when regular expressions are turned off?

We can artificially divide findstr into two modes, "regular expression pattern" and "normal string pattern".

Findstr defaults to "regular expression pattern", plus the / r parameter is also "regular expression pattern" (in other words, the / r parameter is a bit redundant).

With the / l parameter added, findstr is converted to "normal string mode" (in fact, find is this mode, and only this mode).

Under "normal string mode", use the same code to see what the result is?

Code:

The code is as follows:

C:\ Users\ helloworld\ Desktop > findstr / li "^ hello" a.txt

It didn't show anything.

The lines that start with hello clearly have the following, why not show them?

The code is as follows:

Hello hello

Hello World

Hello Boy

Hello, good man.

Because, when you use the "normal string pattern", findstr will not treat ^ as a metacharacter of a regular expression, but just as an ordinary character ^, that is to say, it no longer has the function of "representing the beginning of a line". It has become the same ordinary people as characters such as h, with no "privileges" anymore.

Change the content of a.txt: ^ hello

The code is as follows:

Hello

Hello hello

Good hello

Hello, hello world.

Hello World

Hello Boy

Hello, good man.

Goodbye!

Run the code again:

The code is as follows:

C:\ Users\ helloworld\ Desktop > findstr / nli "^ hello" a.txt

Results:

The code is as follows:

1: ^ hello

7. Find a line that does not contain the specified character

If you compare the find and findstr commands, you will find that they both have the / v find and findstr commands, and they all have the same function, that is, the / v parameter.

Look for rows that do not contain hello.

Code:

The code is as follows:

C:\ Users\ helloworld\ Desktop > findstr / vni "hello" a.txt

Results:

The code is as follows:

9:goodbye!

8. How do I find a file name that contains a string in the current directory and subdirectories?

While writing this tutorial, I came across a batch of friends who asked this question, question address: http://bbs.bathome.net/viewthread.php?tid=14727

Code:

The code is as follows:

Findstr / ms "professional" * .txt

Effect:

Find out the text files that contain "professional" in the current directory and subdirectories, and display only their file names.

9. Use text to make the file to find And use text to make the string to find

Use the text to make the file you want to find

Create a new file.txt with the following content (this text specifies the path of the text that findstr is looking for):

The code is as follows:

C:\ Users\ helloworld\ Desktop\ 1.txt

C:\ Users\ helloworld\ Desktop\ a.txt

C:\ Users\ helloworld\ Desktop\ clip.txt

C:\ Users\ helloworld\ Desktop\ CrLf batch note.txt

C:\ Users\ helloworld\ Desktop\ file.txt

C:\ Users\ helloworld\ Desktop\ MyRarHelp.txt

C:\ Users\ helloworld\ Desktop\ test.txt

C:\ Users\ helloworld\ Desktop\ Red Mansion .txt

C:\ Users\ helloworld\ Desktop\ 520\ create a new text document. Txt

C:\ Users\ helloworld\ Desktop\ 520\ 12\ hello_ world.txt

C:\ Users\ helloworld\ Desktop\ programming\ help.txt

C:\ Users\ helloworld\ Desktop\ programming\ win7 help has more commands than xp help. Txt

C:\ Users\ helloworld\ Desktop\ programming\ wmic.txt

Code:

The code is as follows:

C:\ Users\ helloworld\ Desktop > findstr / f:file.txt / im "hello"

Effect:

The code is as follows:

C:\ Users\ helloworld\ Desktop\ 1.txt

C:\ Users\ helloworld\ Desktop\ a.txt

C:\ Users\ helloworld\ Desktop\ CrLf batch note.txt

C:\ Users\ helloworld\ Desktop\ file.txt

C:\ Users\ helloworld\ Desktop\ test.txt

Use text to make the string you want to find

Create a new string.txt with the following content (this text specifies the string that findstr is looking for):

The code is as follows:

^ hello

World

A.txt

The code is as follows:

^ hello

Hello

Hello hello

Good hello

Hello, hello.

Hello World

Hello Boy

Hello, good man.

Goodbye!

Code:

The code is as follows:

C:\ Users\ helloworld\ Desktop > findstr / ig:string.txt a.txt

Effect:

The code is as follows:

Hello

Hello hello

Hello World

Hello Boy

Hello, good man.

Ignored lines

The code is as follows:

^ hello

Good hello

Hello, hello.

Goodbye!

As can be seen from the ignored "^ hello", if the search string specified with / g contains "metacharacters" without the / l parameter, it is used as a regular expression, not as a normal expression.

10. Search for a sentence that matches exactly

In fact, there is a good example of the help that findstr comes with:

For example: 'FINDSTR "hello there" x.y' look for "hello" or "x.y" in the file x.y

"there". FINDSTR / C: "hello there" x.y' file x.y search

"hello there".

You can use this example to do a test.

The code is as follows:

A.txthello there

Hellothere

Hello

There

Code:

The code is as follows:

C:\ Users\ helloworld\ Desktop > findstr / ic: "hello there" a.txt

Results:

The code is as follows:

Hello there

This is the exact match of the sentence.

11. Search for an exact match.

Two metacharacters are also involved here:\.

Let's try an example first.

A.txt

The code is as follows:

Far there

Farthere

There

Far

Farm

Farmer

Code:

The code is as follows:

C:\ Users\ helloworld\ Desktop > findstr "far" a.txt

Results:

The code is as follows:

Far there

Farthere

Far

Farm

Farmer

My intention was to look for lines with the word "far", but farthere, farm, and farmer showed up, which was not what I wanted.

What if only lines containing the word "far" are required to be displayed?

Code:

The code is as follows:

C:\ Users\ helloworld\ Desktop > findstr "\" a.txt

Results:

The code is as follows:

Far there

Far

twelve。 Specify the directory to find

I have always classified the / d parameters into the same category as / f and / g, but they are actually quite different. / f and / g use text files to determine the files and strings to be found, while / d writes the directory name directly into the command.

Code:

The code is as follows:

C:\ Users\ helloworld\ Desktop > findstr / imd:520; programming; ". *" * .txt "

Results:

The code is as follows:

520:

Hello.txt

Programming:

Help.txt

The code is as follows:

Win7 help has more commands than xp help. Txt

Wmic.txt

Find all txt files that contain arbitrary characters in the programming directory.

13. Statistical number of characters

/ o: print the character offset before each line, and print the position between the beginning of the line and the beginning of the file before each line is found, that is, how many characters, such as the following in test.txt:

The code is as follows:

Aaaaaaaaaa

Aaaaaaaaaa

Aaaaaaaaaa

Aaaaaaaaaa

Aaaaaaaaaa

Aaaaaaaaaa

Execute the command: findstr / o. * test.txt

::. * in the previous line is the content of the regular expression, indicating any line, including blank lines

The results are as follows:

The code is as follows:

0:aaaaaaaaaa

12:aaaaaaaaaa

24:aaaaaaaaaa

36:aaaaaaaaaa

48:aaaaaaaaaa

Note that the carriage return feed character at the end of each line counts as two characters.

14. Displays the file name in the specified color

/ a: when the searched file name contains the wildcard character * or? Specify a color attribute for the file name section of the search results. For specific color values, see color help:

0 = black 8 = gray

1 = blue 9 = light blue

2 = green A = light green

3 = light green B = light green

4 = red C = light red

5 = purple D = lavender

6 = yellow E = light yellow

7 = White F = bright white

Often used for color display, to give a simple example, want to color display "batch house" how to do, if the current color is set to 27 (background green, font white), with blue display "batch house" how to do? :: the backspace character of the next line can be obtained by pressing ctrl+p in cmd edit mode and then pressing the backspace key > "batch home" set / p = "batch home" set / p =

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