YSH(1p) User Contributed Perl Documentation YSH(1p)
NAME
ysh - The YAML Test Shell
SYNOPSIS
ysh [options]
DESCRIPTION
This program is designed to let you play with the Perl YAML modules in
an interactive way. When you to type in Perl, you get back YAML. And
vice versa.
By default, every line you type is a one line Perl program, the return
value of which will be displayed as YAML.
To enter multi-line Perl code start the first line with ';' and use as
many lines as needed. Terminate with a line containing just ';'.
To enter YAML text, start with a valid YAML separator/header line which
is typically '---'. Use '===' to indicate that there is no YAML header.
Enter as many lines as needed. Terminate with a line containing just
'...'.
To read in and process an external YAML file, enter '< filename'. The
ysh will also work as a standalone filter. It will read anything on
STDIN as a YAML stream and write the Perl output to STDOUT. You can say
(on most Unix systems):
cat yaml.file | ysh | less
COMMAND LINE OPTIONS
-MYAML::Module
Set the YAML implementation module you wish.
-l Keep a log of all ysh activity in './ysh.log'. If the log file
already exists, new content will be concatenated to it.
-L Keep a log of all ysh activity in './ysh.log'. If the log file
already exists, it will be deleted first.
-r Test roundtripping. Every piece of Perl code entered will be
Dumped, Loaded, and Dumped again. If the two stores do not match,
an error message will be reported.
-R Same as above, except that a confirmation message will be printed
when the roundtrip succeeds.
-i<number>
Specify the number of characters to indent each level. This is the
same as setting $YAML::Indent.
-ub Shortcut for setting '$YAML::UseBlock = 1'. Force multiline scalars
to use 'block' style.
-uf Shortcut for setting '$YAML::UseFold = 1'. Force multiline scalars
to use 'folded' style.
-uc Shortcut for setting '$YAML::UseCode = 1'. Allows subroutine
references to be processed.
-nh Shortcut for setting '$YAML::UseHeader = 0'.
-nv Shortcut for setting '$YAML::UseVersion = 0'.
-v Print the versions of ysh and the YAML implementation module in
use.
-V In addition to the -v info, print the versions of YAML related
modules.
-h Print a help message.
YSH_OPT
If you don't want to enter your favorite options every time you enter
ysh, you can put the options into the "YSH_OPT" environment variable.
Do something like this:
export YSH_OPT='-i3 -uc -L'
SEE ALSO
YAML
AUTHOR
Ingy döt Net <ingy@cpan.org>
COPYRIGHT
Copyright 2001-2014. Ingy döt Net.
This program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
See <http://www.perl.com/perl/misc/Artistic.html>
perl v5.32.0 2021-01-03 YSH(1p)
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