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What does grep -w do?

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In here grep is used with the option -w. I did man grep and grep --help to try to find what the aforementioned option does. Neither output says anything about a -w option.

What does that option do? Why does it not appear in manor --help? In case something similar happens again, where else can I check for an answer?

I am currently using Ubuntu, if that is relevant (is it?)

man options documentation

share|improve this question

asked 25 mins ago

RUBEN GONÇALO MOROUÇORUBEN GONÇALO MOROUÇO

143

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  My man page and --help (from Debian, probably older than yours) both list -w, --word-regexp force PATTERN to match only whole words. Which grep version are you using?
  
  – Michael Homer
  21 mins ago
  

  
  
  
  

add a comment | 

0

In here grep is used with the option -w. I did man grep and grep --help to try to find what the aforementioned option does. Neither output says anything about a -w option.

What does that option do? Why does it not appear in manor --help? In case something similar happens again, where else can I check for an answer?

I am currently using Ubuntu, if that is relevant (is it?)

man options documentation

share|improve this question

asked 25 mins ago

RUBEN GONÇALO MOROUÇORUBEN GONÇALO MOROUÇO

143

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  My man page and --help (from Debian, probably older than yours) both list -w, --word-regexp force PATTERN to match only whole words. Which grep version are you using?
  
  – Michael Homer
  21 mins ago
  

  
  
  
  

add a comment | 

In here grep is used with the option -w. I did man grep and grep --help to try to find what the aforementioned option does. Neither output says anything about a -w option.

What does that option do? Why does it not appear in manor --help? In case something similar happens again, where else can I check for an answer?

I am currently using Ubuntu, if that is relevant (is it?)

man options documentation

share|improve this question

asked 25 mins ago

RUBEN GONÇALO MOROUÇORUBEN GONÇALO MOROUÇO

143

share|improve this question

asked 25 mins ago

RUBEN GONÇALO MOROUÇORUBEN GONÇALO MOROUÇO

143

share|improve this question

asked 25 mins ago

RUBEN GONÇALO MOROUÇORUBEN GONÇALO MOROUÇO

143

asked 25 mins ago

RUBEN GONÇALO MOROUÇORUBEN GONÇALO MOROUÇO

143

asked 25 mins ago

RUBEN GONÇALO MOROUÇORUBEN GONÇALO MOROUÇO

143

2 Answers
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0

-w, --word-regexp
Select only those lines containing matches that form whole words. The test is that the matching substring must either be at the
beginning of the line, or preceded by a non-word constituent
character. Similarly, it must be either at the end of the line or
followed by a non-word constituent character. Word-constituent
characters are letters, digits, and the underscore.

Source: https://linux.die.net/man/1/grep

share|improve this answer

answered 21 mins ago

BenjaminBenjamin

766

add a comment | 

0

# grep --help | grep -e -w

  -w, --word-regexp         force PATTERN to match only whole words

  -H, --with-filename       print file name with output lines

  -L, --files-without-match  print only names of FILEs with no selected lines

  -l, --files-with-matches  print only names of FILEs with selected lines

# grep PRETTY /etc/os-release

PRETTY_NAME="Ubuntu 18.04 LTS"

# man grep | grep -e -w -A1

       -w, --word-regexp

              Select only those lines containing matches that form whole words.  The test is that the matching substring must either be at the beginning of the line, or preceded by a non-word constituent  character.   Similarly,  it

              must be either at the end of the line or followed by a non-word constituent character.  Word-constituent characters are letters, digits, and the underscore.

share

edited 2 mins ago

answered 8 mins ago

murumuru

39.6k595171

add a comment | 

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0

-w, --word-regexp
Select only those lines containing matches that form whole words. The test is that the matching substring must either be at the
beginning of the line, or preceded by a non-word constituent
character. Similarly, it must be either at the end of the line or
followed by a non-word constituent character. Word-constituent
characters are letters, digits, and the underscore.

Source: https://linux.die.net/man/1/grep

share|improve this answer

answered 21 mins ago

BenjaminBenjamin

766

add a comment | 

0

-w, --word-regexp
Select only those lines containing matches that form whole words. The test is that the matching substring must either be at the
beginning of the line, or preceded by a non-word constituent
character. Similarly, it must be either at the end of the line or
followed by a non-word constituent character. Word-constituent
characters are letters, digits, and the underscore.

Source: https://linux.die.net/man/1/grep

share|improve this answer

answered 21 mins ago

BenjaminBenjamin

766

add a comment | 

-w, --word-regexp
Select only those lines containing matches that form whole words. The test is that the matching substring must either be at the
beginning of the line, or preceded by a non-word constituent
character. Similarly, it must be either at the end of the line or
followed by a non-word constituent character. Word-constituent
characters are letters, digits, and the underscore.

Source: https://linux.die.net/man/1/grep

share|improve this answer

answered 21 mins ago

BenjaminBenjamin

766

share|improve this answer

answered 21 mins ago

BenjaminBenjamin

766

answered 21 mins ago

BenjaminBenjamin

766

answered 21 mins ago

BenjaminBenjamin

766

0

# grep --help | grep -e -w

  -w, --word-regexp         force PATTERN to match only whole words

  -H, --with-filename       print file name with output lines

  -L, --files-without-match  print only names of FILEs with no selected lines

  -l, --files-with-matches  print only names of FILEs with selected lines

# grep PRETTY /etc/os-release

PRETTY_NAME="Ubuntu 18.04 LTS"

# man grep | grep -e -w -A1

       -w, --word-regexp

              Select only those lines containing matches that form whole words.  The test is that the matching substring must either be at the beginning of the line, or preceded by a non-word constituent  character.   Similarly,  it

              must be either at the end of the line or followed by a non-word constituent character.  Word-constituent characters are letters, digits, and the underscore.

share

edited 2 mins ago

answered 8 mins ago

murumuru

39.6k595171

add a comment | 

0

# grep --help | grep -e -w

  -w, --word-regexp         force PATTERN to match only whole words

  -H, --with-filename       print file name with output lines

  -L, --files-without-match  print only names of FILEs with no selected lines

  -l, --files-with-matches  print only names of FILEs with selected lines

# grep PRETTY /etc/os-release

PRETTY_NAME="Ubuntu 18.04 LTS"

# man grep | grep -e -w -A1

       -w, --word-regexp

              Select only those lines containing matches that form whole words.  The test is that the matching substring must either be at the beginning of the line, or preceded by a non-word constituent  character.   Similarly,  it

              must be either at the end of the line or followed by a non-word constituent character.  Word-constituent characters are letters, digits, and the underscore.

share

edited 2 mins ago

answered 8 mins ago

murumuru

39.6k595171

add a comment | 

# grep --help | grep -e -w

  -w, --word-regexp         force PATTERN to match only whole words

  -H, --with-filename       print file name with output lines

  -L, --files-without-match  print only names of FILEs with no selected lines

  -l, --files-with-matches  print only names of FILEs with selected lines

# grep PRETTY /etc/os-release

PRETTY_NAME="Ubuntu 18.04 LTS"

# man grep | grep -e -w -A1

       -w, --word-regexp

              Select only those lines containing matches that form whole words.  The test is that the matching substring must either be at the beginning of the line, or preceded by a non-word constituent  character.   Similarly,  it

              must be either at the end of the line or followed by a non-word constituent character.  Word-constituent characters are letters, digits, and the underscore.

share

edited 2 mins ago

answered 8 mins ago

murumuru

39.6k595171

# grep --help | grep -e -w

  -w, --word-regexp         force PATTERN to match only whole words

  -H, --with-filename       print file name with output lines

  -L, --files-without-match  print only names of FILEs with no selected lines

  -l, --files-with-matches  print only names of FILEs with selected lines

# grep PRETTY /etc/os-release

PRETTY_NAME="Ubuntu 18.04 LTS"

# man grep | grep -e -w -A1

       -w, --word-regexp

              Select only those lines containing matches that form whole words.  The test is that the matching substring must either be at the beginning of the line, or preceded by a non-word constituent  character.   Similarly,  it

              must be either at the end of the line or followed by a non-word constituent character.  Word-constituent characters are letters, digits, and the underscore.

share

edited 2 mins ago

answered 8 mins ago

murumuru

39.6k595171

answered 8 mins ago

murumuru

39.6k595171

answered 8 mins ago

murumuru

39.6k595171