[Perl]

   Check syntax : perl -cw script.pl
   
   recommended  : use strict;
                  use warnings;

[vi]

   :r !command

[Netscreen]

  # debug flow all
  # clear dbuf
  # get dbuf stream

[zsh]

#for ((index = 1; index < 5; index++)) 
for> do
for> echo $index
for> done

# echo "hello" > test.txt | cat