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# Evaluate an Awk expression given on the command line with an optional format
# Count arguments
case $# in
# If one argument, we assume format is %s
1) form=%s expr=$1 ;;
# If two arguments, first is format, second expression
2) form=$1 expr=$2 ;;
# Any other number of arguments is wrong
*)
printf >&2 'ax: Need an expression\n'
exit 2
;;
esac
# Important note: there's little stopping the user from putting a fully-fledged
# Awk program into the expression; don't use this anywhere that code injection
# could wreck your life. See manual page ax(1df).
awk -v form="$form" 'BEGIN{printf form,('"$expr"');exit}'
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