perlsh man page

perlsh — one-line perl evaluator with line editing function and variable name completion function

Description

This program reads input a line, and evaluates it by perl interpreter, and prints the result. If the result is a list value then each value of the list is printed line by line. This program can be used as a very strong calculator which has whole perl functions.

This is a sample program Term::ReadLine::Gnu module. When you input a line, the line editing function of GNU Readline Library is available. Perl symbol name completion function is also available.

Before invoking, this program reads ~/.perlshrc and evaluates the content of the file.

When this program is terminated, the content of the history buffer is saved in a file ~/.perlsh_history, and it is read at next invoking.

Variables

You can customize the behavior of "perlsh" by setting following variables in ~/.perlshrc;

$PerlSh::PS1

The primary prompt string. The following backslash-escaped special characters can be used.

\h: host name
\u: user name
\w: package name
\!: history number

The default value is `"\w[\!]$ "'.

$PerlSh::PS2
The secondary prompt string. The default value is `"> "'.
$PerlSh::HISTFILE
The name of the file to which the command history is saved. The default value is "~/.perlsh_history".
$PerlSh::HISTSIZE
If not "undef", this is the maximum number of commands to remember in the history. The default value is 256.
$PerlSh::STRICT
If true, restrict unsafe constructs. See "use strict" in perl man page. The default value is 0;

Files

~/.perlshrc

This file is eval-ed at initialization. If a subroutine "afterinit" is defined in this file, it will be eval-ed after initialization. Here is a sample.

# -*- mode: perl -*-
# decimal to hexa
sub h { map { sprintf("0x%x", $_ ) } @_;}
sub tk {
    $t->tkRunning(1);
    use Tk;
    $mw = MainWindow->new();
}
# for debugging Term::ReadLine::Gnu
sub afterinit {
    *t = \$PerlSh::term;
    *a = \$PerlSh::attribs;
}
~/.perlsh_history
~/.inputrc
A initialization file for the GNU Readline Library. Refer its manual for details.

See Also

Term::ReadLine::Gnu <http://search.cpan.org/dist/Term-ReadLi…>

GNU Readline Library <http://cnswww.cns.cwru.edu/php/chet/rea…>

Author

Hiroo Hayashi <hiroo.hayashi@computer.org>

Info

2016-11-06 perl v5.24.0 User Contributed Perl Documentation