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Input for read command

 
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# 1  
Old 02-28-2014
Input for read command
Hello,

I want to use the read command in order to input a keyword from the keyboard.
I then want to use this keyword in a grep command.
How to I input a phrase as a keyword? For example if I use
Code:
read keyword
"today is"

and then use grep, I get "No such file or directory" error.
# 2  
Old 02-28-2014
What are you trying to grep?
# 3  
Old 02-28-2014
Quick and dirty guess since I don't know you're OS or shell:

Code:
read -p "Keyword: " keyword;echo $keyword | xargs -n1 -i grep '{}' file

# 4  
Old 02-28-2014
Quote:
Originally Posted by vbe
What are you trying to grep?
I want to use keyword to grep in another file.
But the keyword can also be a phrase eg I want to grep the whole phrase "today is" from the next file.
# 5  
Old 02-28-2014
Be sure to use double quotes around the variable reference, then it should work correctly. Also it is to best use the -r option so that backslashes are not interpreted by the read command, for example:
Code:
read -r regex
grep "$regex" file

# 6  
Old 02-28-2014
Quote:
Originally Posted by Scrutinizer
Be sure to use double quotes around the variable reference, then it should work correctly. Also it is to best use the -r option so that backslashes are not interpreted by the read command, for example:
Code:
read -r regex
grep "$regex" file

Thank you.
That seems to work in most cases, although not when -i is used in grep.
But this solved my problem, so thanks.
# 7  
Old 02-28-2014
If you want it to take it as a literal string and not a regex, grep -F "$string"
 
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