printf - format and print data

Options you will use

%s %d %f %x

String, integer, float, hex.

%-10s %5.2f

Left-justify in 10 columns; 5 wide, 2 decimals.

Gotchas

• printf is portable and predictable where echo is not (echo -e differs between shells). It reuses the format until the arguments run out.

Taught in

• 0.2 Percentiles by hand, and why they do not average
• 4.19 du, df and finding the space
• 6.5 Exit status, subshells and case
• 6.8 Reading input: while read, IFS and mapfile
• 7.4 cut, sort, uniq, tr, column
• 7.6 sed
• 7.16 xargs
• 18.6 kubeadm init and join: what they actually do