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.\" ========================================================================
.\"
.IX Title "PERLSH 1p"
.TH PERLSH 1p "2020-12-30" "perl v5.32.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
perlsh \- one\-line perl evaluator with line editing function and
	 variable name completion function
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&  perlsh
.Ve
.SH "DESCRIPTION"
.IX Header "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.
.PP
This is a sample program Term::ReadLine::Gnu module.  When you input a
line, the line editing function of \s-1GNU\s0 Readline Library is available.
Perl symbol name completion function is also available.
.PP
Before invoking, this program reads \fI~/.perlshrc\fR and evaluates the
content of the file.
.PP
When this program is terminated, the content of the history buffer is
saved in a file \fI~/.perlsh_history\fR, and it is read at next
invoking.
.SH "VARIABLES"
.IX Header "VARIABLES"
You can customize the behavior of \f(CW\*(C`perlsh\*(C'\fR by setting following
variables in \fI~/.perlshrc\fR;
.ie n .IP "$PerlSh::PS1" 4
.el .IP "\f(CW$PerlSh::PS1\fR" 4
.IX Item "$PerlSh::PS1"
The primary prompt string.  The following backslash-escaped special
characters can be used.
.Sp
.Vb 4
\&        \eh: host name
\&        \eu: user name
\&        \ew: package name
\&        \e!: history number
.Ve
.Sp
The default value is `\f(CW\*(C`\ew[\e!]$ \*(C'\fR'.
.ie n .IP "$PerlSh::PS2" 4
.el .IP "\f(CW$PerlSh::PS2\fR" 4
.IX Item "$PerlSh::PS2"
The secondary prompt string.  The default value is `\f(CW\*(C`> \*(C'\fR'.
.ie n .IP "$PerlSh::HISTFILE" 4
.el .IP "\f(CW$PerlSh::HISTFILE\fR" 4
.IX Item "$PerlSh::HISTFILE"
The name of the file to which the command history is saved.  The
default value is \f(CW\*(C`~/.perlsh_history\*(C'\fR.
.ie n .IP "$PerlSh::HISTSIZE" 4
.el .IP "\f(CW$PerlSh::HISTSIZE\fR" 4
.IX Item "$PerlSh::HISTSIZE"
If not \f(CW\*(C`undef\*(C'\fR, this is the maximum number of commands to remember in
the history.  The default value is 256.
.ie n .IP "$PerlSh::STRICT" 4
.el .IP "\f(CW$PerlSh::STRICT\fR" 4
.IX Item "$PerlSh::STRICT"
If true, restrict unsafe constructs.  See \f(CW\*(C`use strict\*(C'\fR in perl man
page.  The default value is 0;
.SH "FILES"
.IX Header "FILES"
.IP "\fI~/.perlshrc\fR" 4
.IX Item "~/.perlshrc"
This file is eval-ed at initialization.  If a subroutine \f(CW\*(C`afterinit\*(C'\fR
is defined in this file, it will be eval-ed after initialization.
Here is a sample.
.Sp
.Vb 3
\&        # \-*\- mode: perl \-*\-
\&        # decimal to hexa
\&        sub h { map { sprintf("0x%x", $_ ) } @_;}
\&
\&        sub tk {
\&            $t\->tkRunning(1);
\&            use Tk;
\&            $mw = MainWindow\->new();
\&        }
\&
\&        # for debugging Term::ReadLine::Gnu
\&        sub afterinit {
\&            *t = \e$PerlSh::term;
\&            *a = \e$PerlSh::attribs;
\&        }
.Ve
.IP "\fI~/.perlsh_history\fR" 4
.IX Item "~/.perlsh_history"
.PD 0
.IP "\fI~/.inputrc\fR" 4
.IX Item "~/.inputrc"
.PD
A initialization file for the \s-1GNU\s0 Readline Library.  Refer its manual
for details.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
Term::ReadLine::Gnu <http://search.cpan.org/dist/Term-ReadLine-Gnu/>
.PP
\&\s-1GNU\s0 Readline Library <https://tiswww.cwru.edu/php/chet/readline/rltop.html>
.SH "AUTHOR"
.IX Header "AUTHOR"
Hiroo Hayashi <hiroo.hayashi@computer.org>