Awk Command

# menampilkan kolom 3 dan 4
awk '{print $3 "\t" $4}' marks.txt

# prints all the lines that match pattern.
awk '/a/ print:$0}' test.txt
awk '/a/' tag.txt

# prints the third and fourth field when a pattern match succeeds.
awk '/a/ {print $3 "\t" $4}' test.txt

# prints the fourth column followed by the third column.
awk '/a/ {print $4 "\t" $3}' test.txt

# print the number of lines for which a pattern match succeeded.
awk '/a/{++cnt} END {print "Count = ", cnt}' test.txt

# print only those lines that contain more than 18 characters.
awk 'length($0) > 18' test.txt

# replace ' (single quote)
awk '{gsub( "[:'\'']","" ); print}'