CODEWITHSUNDEEP
linuxshellgrep
karkator
karkator

Reputation: 61

GREP to search for second column in a text file

I need to GREP second column (path name) from the text file. I have a text file which has a md5checksum filepath size . Such as: 

ce75d423203a62ed05fe53fe11f0ddcf kart/pan/mango.sh 451b
8e6777b67f1812a9d36c7095331b23e2 kart/hey/local 301376b
e0ddd11b23378510cad9b45e3af89d79 yo/cat/so 293188b
4e0bdbe9bbda41d76018219f3718cf6f asuo/hakl 25416b

the above is the text file, I used grep -Eo '[/]' file.txt but it prints only / , but i want the output like this:

kart/pan/mango.sh
kart/hey/local
yo/cat/so
asuo/hakl

Lastly I have to use GREP.

Upvotes: 0

Views: 6844

Answers (4)

Walter A
Walter A

Reputation: 19982

When you are allowed to combine grep with other tools and your input file only has slashes in the second field, you can use

tr " " "\n" < file.txt | grep '/'

Upvotes: 0

Sorin
Sorin

Reputation: 5395

If you can live with spaces before and after, you can use:

grep -o "\s[[:alnum:]/]*\s"

If you need the spaces removed, you will need some zero-width look-ahead/look-behind which is only available with -P (perl regexes), if you have that you can use:

grep -Po "(?<=\s)[[:alnum:]/]+(?=\s)"
  • (?<=\s) - look-behind to see if there is a space preceding the string, but not capture it
  • (?=\s) - look-ahead to see if there is a space after the match, but not capture it
  • [:alnum:] - match alpha numeric chars
  • [[:alnum:]/] - match alphanumeric chars and /
  • + - match one or more

However, grep is not the right tool for this, cut/sed/awk are way better

Upvotes: 3

Vineeth Elias
Vineeth Elias

Reputation: 99

Use awk instead.

awk '{print $2}' file.txt

Upvotes: 1

x3l51
x3l51

Reputation: 731

cut -d ' ' -f 2

-d ' ' means your delimiter is the space -f 2 meant you want to only print field number two

Upvotes: 1

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