The awk action is inside braces {}
ps | awk '{print $1}''
Default separator is spaces
Change it to , for csv
awk -F ","
Change to : for passwd file
awk -F ":"
awk -F ":" '{print $1}' /etc/passwd
Print out multiple columns
awk -F ":" '{print $1 $6 $7}' /etc/passwd
Add some tabs between outputs to make it more readable
awk -F ":" '{print $1"\t"$6"\t"$7}' /etc/passwd
Change the field separator
Work on data that has : as field separator
But output the data with - as the field separator
awk 'BEGIN{FS=":" OFS="-"} {print $1,$6,$7}' /etc/password
Print the last column
awk -F "/" '/^\//' {print $NF} /etc/shells | uniq | sort
the /'s need to be escaped \/dev
df | awk '/\/dev\/loop/' {print $1"\t"$2}
Find all the /bin/fish running
ps -ef | awk '{if ($NF == "/bin/fish") print $0}'
For loop
awk 'BEGIN {for 1=1; i<=10; i++) print "The square root of", i, "is", i*i';}'
Matching a pattern
awk '$1 ~ /^[b,c]/ {print $0}' .bashrc
awk 'match ($0, /mystring/' {print $0}'' numbered.txt
Print a section (NR number of records, line numbers)
between lines 7 and 11
df | awk 'NR==7, NR==11 {print NR, $0}'
Getting a line count
awk 'END {print NR}' /etc/shells
