Grep and Regular Expressions Flashcards
1
Q
What does grep do
A
Prints lines that match defined pattern
2
Q
How do you use grep to search case insensative
A
grep -i “search pattern”
3
Q
Shows lines not containing pattern
A
grep -v
4
Q
Search for pattern in filename
A
grep error /var/log/messages
5
Q
Search for lines starting with error
A
grep “^error” /var/log/messages
6
Q
Search for lines ending with error
A
grep “error$” /var/log/messages
7
Q
Search for all characters except (aeiou)
A
grep “[^aeiou]” /var/log/messages
8
Q
Search for the pattern error and Error
A
grep [eE]rror /var/log/messages
9
Q
Search for empty lines
A
grep “^$” /var/log/messages
10
Q
Search for only un-commented lines
A
grep -v ^# /etc/ssh/sshd_config
11
Q
What is egrep
A
same as grep but using extended regular expressions
12
Q
What is fgrep
A
interprets patterns as list of fixed strings
