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Full Discussion: m4 as script interpreter
Top Forums UNIX for Dummies Questions & Answers m4 as script interpreter Post 302321332 by drl on Sunday 31st of May 2009 07:47:35 PM
Old 05-31-2009
Hi.

Quote:
Comments in `m4' are normally delimited by the characters `#' and
newline. All characters between the comment delimiters are ignored,
but the entire comment (including the delimiters) is passed through to
the output--comments are _not_ discarded by `m4'.

-- excerpt from info m4
So a code like:
Code:
#!/usr/bin/m4
# This is *another* comment.
define(`A',`Turbo')dnl
A

would produce:
Code:
% ./s1
#!/usr/bin/m4
# This is *another* comment.
Turbo

You could avoid this with:
Code:
#!/usr/bin/env bash

m4 <<EOF
define('A','Turbo')dnl
A
EOF

which produces:
Code:
% ./s2
A

NOTE: see correction for quoting in post below.

Best wishes ... cheers, drl

Last edited by drl; 06-03-2009 at 12:07 AM.. Reason: Add note for correction in later post.
 

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getusershell(3C)					   Standard C Library Functions 					  getusershell(3C)

NAME
getusershell, setusershell, endusershell - get legal user shells SYNOPSIS
#include <unistd.h> char *getusershell(void); void setusershell(void); void endusershell(void); DESCRIPTION
The getusershell() function returns a pointer to a legal user shell as defined by the system manager in the file /etc/shells. If /etc/shells does not exist, the following locations of the standard system shells are used in its place: /bin/bash /bin/csh /bin/jsh /bin/ksh /bin/ksh93 /bin/pfcsh /bin/pfksh /bin/pfsh /bin/sh /bin/tcsh /bin/zsh /sbin/jsh /sbin/pfsh /sbin/sh /usr/bin/bash /usr/bin/csh /usr/bin/jsh /usr/bin/ksh /usr/bin/ksh93 /usr/bin/pfcsh /usr/bin/pfksh /usr/bin/pfsh /usr/bin/sh /usr/bin/tcsh /usr/bin/zsh /usr/sfw/bin/zsh /usr/xpg4/bin/sh The getusershell() function opens the file /etc/shells, if it exists, and returns the next entry in the list of shells. The setusershell() function rewinds the file or the list. The endusershell() function closes the file, frees any memory used by getusershell() and setusershell(), and rewinds the file /etc/shells. RETURN VALUES
The getusershell() function returns a null pointer on EOF. BUGS
All information is contained in memory that may be freed with a call to endusershell(), so it must be copied if it is to be saved. NOTES
Restricted shells should not be listed in /etc/shells. SunOS 5.11 1 Nov 2007 getusershell(3C)
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