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The following awk program roughly simulates the history facility of certain shells. A line containing only = re-executes the last command executed. A line beginning with = cmd re-executes the last command whose invocation included the string cmd. Otherwise, the current line is executed.
$1 == "=" { if (NF == 1) system(x[NR] = x[NR-1]) else for (i = NR-1; i > 0; i--) if (x[i] ~ $2) { system(x[NR] = x[i]) break } next }/./ { system(x[NR] = $0) }