$ whatis awk
awk (1)              - pattern scanning and text processing language

$ apropos ^awk$
awk (1)              - pattern scanning and text processing language

$ whatis sed
sed (1)              - stream editor for filtering and transforming text

$ aptitude show sed
...
Description: The GNU sed stream editor
sed reads the specified files or the standard input if no files are specified, makes editing
changes according to a list of commands, and writes the results to the standard output.
Homepage: http://www.gnu.org/software/sed/

npm install -g tldr

$ tldr awk

  awk

  A versatile programming language for working on files.

  - Print the fifth column (a.k.a. field) in a space-separated file:
    awk '{print $5}' filename

  - Print the second column of the lines containing "something" in a space-separated file:
    awk '/something/ {print $2}' filename

  - Print the last column of each line in a file, using a comma (instead of space) as a field separator:
    awk -F ',' '{print $NF}' filename

  - Sum the values in the first column of a file and print the total:
    awk '{s+=$1} END {print s}' filename

  - Sum the values in the first column and pretty-print the values and then the total:
    awk '{s+=$1; print $1} END {print "--------"; print s}' filename

  - Print every third line starting from the first line:
    awk 'NR%3==1' filename

$ cheat awk
# sum integers from a file or stdin, one integer per line:
printf '1\n2\n3\n' | awk '{ sum += $1} END {print sum}'

# using specific character as separator to sum integers from a file or stdin
printf '1:2:3' | awk -F ":" '{print $1+$2+$3}'

# print a multiplication table
seq 9 | sed 'H;g' | awk -v RS='' '{for(i=1;i<=NF;i++)printf("%dx%d=%d%s", i, NR, i*NR, i==NR?"\n":"\t")}'

# Specify output separator character
printf '1 2 3' | awk 'BEGIN {OFS=":"}; {print $1,$2,$3}'