CODEWITHSUNDEEP
stringbashnumbersmatch
croussou
croussou

Reputation: 77

Get the entire line from a file which contains a number and string

I have a variable set to a specific number, i.e. num=56 and a file full of numbers and other strings. I would like to match both the number and some of the string and get the entire line which contains them.

For example,

I want to match this is my number: $num [mbits] in a file full of similar lines such as the below.

random text in front - this is my number: 56 [mbits]  
random text in front - this is my number: 21 [mbits]  
random text in front - this is my number: 15 [mbits]  
random text in front - this is my number: 38 [mbits]  
random text in front - this is my number: 49 [mbits]  
random text in front - this is my number: 10 [mbits]  
random text in front - this is my number: 89 [mbits]

I am using the below command, but it does not work when I include the entire string.

grep -n "this is my number: $num [mbits]" info.log >> info1.log

The file remains empty.

It works only as grep -n "this is my number:" info.log >> info1.log and I get all the lines as above. I just need the one with the specific number.

The desired output should be,

random text in front - this is my number: 56 [mbits]

Any help?

Thank you in advance.

Upvotes: 1

Views: 68

Answers (1)

anubhava
anubhava

Reputation: 784898

You need to use grep -F (fixed string match):

num=56
grep -F "this is my number: $num [mbits]" info.log

Or else:

grep "this is my number: $num \[mbits\]" info.log

As [ and ] are special regex characters than need to be escaped.

Output:

random text in front - this is my number: 56 [mbits]

Upvotes: 2

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