gawk: lintold.awk:7: warning: `delete' is not supported in old awk

gawk: lintold.awk:8: warning: old awk does not support the keyword `in' except after `for'

gawk: lintold.awk:9: warning: old awk does not support operator `**='

gawk: lintold.awk:10: warning: old awk does not support the keyword `in' except after `for'

gawk: lintold.awk:10: warning: old awk does not support multidimensional arrays

gawk: lintold.awk:11: warning: operator `^=' is not supported in old awk

gawk: lintold.awk:11: warning: old awk does not support operator `**'

gawk: lintold.awk:11: warning: operator `^' is not supported in old awk

gawk: lintold.awk:13: warning: old awk does not support multiple `BEGIN' or `END' rules

gawk: lintold.awk:15: warning: old awk does not support the `\b' escape sequence

gawk: lintold.awk:15: warning: old awk does not support the `\f' escape sequence

gawk: lintold.awk:15: warning: old awk does not support the `\r' escape sequence

gawk: lintold.awk:19: warning: old awk does not support multiple `BEGIN' or `END' rules

1

gawk: lintold.awk:14: warning: old awk does not support regexps as value of `FS'

done