grep file

ust · 06-10-2009, 03:45 AM

I would like to ask if I want to grep somthing .

I know the command " ll |grep Jun" can grep file with Jun , if I want to grep file with May and Jun , what can i do ? thx

Nylex · 06-10-2009, 03:46 AM

Yes you can use grep to search through files. Read the man page..

Simple example: grep "foo" stuff - this searches for the string "foo" in the file "stuff".

jdkaye · 06-10-2009, 03:50 AM

Just use the "man" command to find out things like this.

Code:

man grep

gives this information:

Quote:

Alternation
Two regular expressions may be joined by the infix operator |; the
resulting regular expression matches any string matching either alternate
expression.

cheers,
jdk

pixellany · 06-10-2009, 04:43 AM

Quote:

Originally Posted by ust

I would like to ask if I want to grep somthing .

I know the command " ll |grep Jun" can grep file with Jun , if I want to grep file with May and Jun , what can i do ? thx

Do you mean "May and Jun", or possibly "May OR Jun".

OR:
egrep '(May|Jun)' filename

AND:
egrep 'May' filename | egrep 'Jun'

Note the two very different meanings of the "|" operator.