使用T：R mod需要一个perl system（）命令的进度指示符

Question

我想要一个perl 的输出的进度指示器

   system('make')

.

以及从make命令输出到stdout的每个行，我想将点作为进度指示器输出。不幸的是，我正在使用这个词:: readline :: gnu perl mod。

如何将stdout重定向以捕获并计算Make命令运行时的行？

Answer 1

#!/usr/bin/perl

my $command = "make";

open (my $cmd, "$command |");
while(<$cmd>){
  print ".";
}
print "\n";

Answer 2

make >& >(while read f; do echo -n .; done; echo)

Obviously this is a shell solution, but a dot as a progress indicator is a dot.

You could of course stick a tee in there to save a copy of the make to file in case of problems.

Since you didn't seem to like (neither upvoted or accepted) the shell solution for some unexplained reason, here is a pure perl one:

if (open(X,"make|")) { local($|)=1; while(<X>) { print "."; } close(X); print "\n";}