Development notes: Debugging Perl data structures

Quick reference

Mac: \r

Unix: \n

Windows: \r\n

vi s/,/,\r/

$CRLF = "\015\012";

perl -le'$q = "\047"; print $q' # single quote

perl -MDevel::Cover=+ignore,.*,-select,^lib,-select,^t,-silent,on t/path/to/test.t

python -m SimpleHTTPServer 8080

python3 -m http.server 8080

warn "mojo response = ".$t->tx->res->to_string;

...->or(sub { diag("Result = ".$t->tx->res->to_string) });

use Data::Printer { class => { internals => 0, inherited => 'public' } };

my $r=\@_; $l->debug("entering ".( caller(0) )[3])." with ". sub { $l->dump(args => $r) }); # log calls to subroutines

patch -p0 < file.patch

DBIC_TRACE_PROFILE=console DBIC_TRACE=1

TEST_METHOD=foo

$Data::Dumper::Maxdepth = 1;

$DB::single = 1;

echo -ne "\033]0;"some title"\007" # set putty title

shopt -s checkwinsize; reset # fix terminal display issue

# bash strict mode

set -euo pipefail

IFS=$'\n\t'

# debug mode

set -vx

(s)printf:

printf '<%+d>', 12; # prints "<+12>"

printf '<%6s>', 12; # prints "< 12>"

printf '<%-6s>', 12; # prints "<12 >"

eval $(dircolors|sed 's/di=01;34/di=01;36/'); # light blue directories

if [ "$(id -u)" != "0" ]; then

echo "This script must be run as root"

exit 1

fi

| python -m json.tool # sorts keys

| json_pp # doesn't sort keys (perl JSON module)

Search and replace over two lines:

sed ':a;N;$!ba;s/\n second line: / second line: /g'

Bash quotes: '\'' & '"'"'

print "debug = ".Dumper({%{{$_->get_columns}}{qw/id shipment_id/}}) foreach $shipment_rs->items; # DBIC quick peek

print $result->{_column_data} # DBIC quicker peek

require Carp; Carp::cluck "got here";

telnet host port

openssl s_client -debug -connect host:port

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