Simple grep and egrep
 Simple egrep commands
This will search for patterns of support help and windows in the file myfile.txt.
egrep "support|help|windows" myfile.txt
This will search for patterns of support within all files in the current directory.
egrep "support" *
Grep uncommented lines in a file
grep -v ^# filename |uniq > comm.txt
 Slightly More Advanced
grep command searches the given file for lines containing a match to the given strings or words. By default, grep prints the matching lines. Use grep to search for lines of text that match one or many regular expressions, and outputs only the matching lines.
The name, “grep”, derives from the command used to perform a similar operation, using the Unix/Linux text editor ed: g/re/p Use grep to search file
Search /etc/passwd for boo user:
grep boo /etc/passwd
You can force grep to ignore word case i.e match boo, Boo, BOO and all other combination with -i option:
grep -i "boo" /etc/passwd
Use grep recursively
You can search recursively i.e. read all files under each directory for a string “192.168.1.5″ cd /etc
grep -R "192.168.1.5" *
Use grep to search words only
When you search for boo, grep will match fooboo, boo123, etc. You can force grep to select only those lines containing matches that form whole words i.e. match only boo word:
grep -w "boo" /path/to/file
Use grep to search 2 different words
use egrep as follows:
egrep -w 'word1|word2' /path/to/file
Count line when words has been matched
grep can report the number of times that the pattern has been matched for each file using -c (count) option:
grep -c 'word' /path/to/file
Also note that you can use -n option, which causes grep to precede each line of output with the number of the line in the text file from which it was obtained:
grep -n 'word' /path/to/file
Grep invert match
You can use -v option to print inverts the match; that is, it matches only those lines that do not contain the given word. For example print all line that do not contain the word bar:
grep -v bar /path/to/file
UNIX / Linux pipes and grep command
grep command often used with pipes. For example print name of hard disk devices:
dmesg | egrep '(s|h)d[a-z]'
Display cpu model name:
cat /proc/cpuinfo | grep -i 'Model'