C-PLOT

Scientific Graphics and Data Analysis

Use awk to multiply the y values by 3:

fn shell.4 awk '{print $1, 3 * $2}'

Use sort to rearrange the data,

fn shell.4 sort -n

This usage sorts the data by x values. (Beware, sort doesn't recognize scientific notation.) Use cat to extract data from an ASCII file,

fn shell.4  cat data

This usage ignores the current data points.