|
|
@@ -0,0 +1,21 @@ |
|
|
|
grep a matches.txt # find lines containing 'a' |
|
|
|
grep ab matches.txt # find lines containing 'abc' |
|
|
|
grep '^ab$' matches.txt # find lines starting with 'abc' |
|
|
|
grep "[hat]" matches.txt # find lines containing h, a or t |
|
|
|
grep -E "[abc]{3,4}" matches.txt # find strings with 3 or 4 successive combination of a, b or c |
|
|
|
grep -E -n -o "[abc]{3,4}" matches.txt # show line numbers and matches only |
|
|
|
ip addr | egrep "([0-9]{1,3}\.){3}[0-9]{1,3}" # find IP addresses |
|
|
|
ip addr | egrep "([[:xdigit:]]{2}:){5}[[:xdigit:]]{2}" # find MAC Addresses |
|
|
|
grep "[[:punct:]]" matches.txt # find punctuation |
|
|
|
grep "[linux]{3,5}" regex.examples # find l,i,n,u, or x in a pattern between 3 to 5 characters |
|
|
|
egrep "[linux]{3,5}" regex.examples # did it work now? |
|
|
|
grep '[[:alpha:]]' regex.examples # find lettes |
|
|
|
fgrep '[[:alpha:]]' regex.examples # find the single quote enclosed string explicitly |
|
|
|
grep "[[:blank:]]" matches.txt # find space or tab |
|
|
|
grep "[[:space:]]" matches.txt # find all whitespace |
|
|
|
grep "[[:blank:]]$" matches.txt # find space or tab at the line’s end |
|
|
|
grep "[[:space:]]$" matches.txt # find whitespace at the line’s end |
|
|
|
grep -i uuid /etc/fstab # find the 'uuid' string |
|
|
|
sed -e 's/UUID/uuid' /etc/fstab | grep uuid # case sensitive |
|
|
|
sed 's/UUID/UUID UUID/' /etc/fstab | sed 's/UUID/uuid/' # replace only the first match of UUID |
|
|
|
sed 's/UUID/UUID UUID/' /etc/fstab | sed 's/UUID/uuid/g' # replace all matches of UUID |