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$! 'f$verify(0)'
$! --- protect against nonstandard definitions ---
$ perl_define = "define/nolog"
$ perl_on = "on error then exit $STATUS"
$ perl_exit = "exit"
$ perl_del = "delete"
$ pif = "if"
$! --- define i/o redirection (sys$output set by lib$spawn)
$ pif perl_popen_in .nes. "" then perl_define/user/name_attributes=confine sys$input 'perl_popen_in'
$ pif perl_popen_err .nes. "" then perl_define/user/name_attributes=confine sys$error 'perl_popen_err'
$ pif perl_popen_out .nes. "" then perl_define sys$output 'perl_popen_out'
$! --- build command line to get max possible length
$c=perl_popen_cmd0
$c=c+perl_popen_cmd1
$c=c+perl_popen_cmd2
$x=perl_popen_cmd3
$c=c+x
$ perl_on
$ 'c'
$ perl_exit '$STATUS'
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