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+There is no repository for useful rc code snippets as yet, so I'm including
+a (short) file in the distribution with some helpful/intriguing pieces of
+rc code.
+
+A sample .rcrc
+--------------
+Here is the .rcrc I use on archone:
+
+umask 022
+path=(/bin /usr/bin /usr/ucb)
+ht=`/usr/arch/bin/hosttype
+h=$home
+history=$h/.history
+bin=$h/bin/$ht
+lib=$h/lib/$ht
+sh=$h/bin/sh
+include=$h/lib/include
+
+switch ($ht) {
+case sun*
+ OBERON='. '$h/other/oberon
+ p=/usr/ucb
+ compiler='gcc -Wall -O -g'
+ MANPATH=$h/man:/usr/arch/man:/usr/man
+ if (! ~ $TERM ()) {
+ stty dec
+ /usr/arch/bin/msgs -q
+ }
+case next
+ p=(/usr/ucb /usr/bin /NextApps)
+ compiler='cc -Wall -O -g -DNODIRENT'
+ MANPATH=$h/man:/usr/arch/man:/usr/man
+ if (! ~ $TERM ())
+ stty dec
+case sgi
+ p=(/usr/ucb /usr/sbin /usr/bin)
+ compiler='gcc -Wall -O -g -DNOSIGCLD'
+ MANPATH=$h/man:/usr/arch/man:/usr/catman
+ if (!{~ $TERM () || ~ $TERM *iris*})
+ stty line 1 intr '' erase '' kill ''
+case *
+ echo .rcrc not configured for this machine
+}
+
+path=(. $sh $bin /usr/arch/bin $p /bin /usr/bin/X11 /etc /usr/etc)
+cdpath=(. .. $h $h/src $h/misc $h/other $h/adm)
+RNINIT=-d$h' -t -M -2400-h -2400+hfrom'; DOTDIR=$h/misc/news
+PRINTER=lw
+
+fn s {
+ echo $status
+}
+fn cd {
+ builtin cd $1 && \
+ switch ($1) {
+ case ()
+ dir=$home
+ case *
+ dir=()
+ }
+}
+fn pwd {
+ if (~ $dir ())
+ dir=`/bin/pwd
+ echo $dir
+}
+fn x {
+ if (~ `tty /dev/console)
+ clear_colormap
+ clear
+ exit
+}
+fn p {
+ if (~ $history ()) {
+ echo '$history not set' >[1=2]
+ return 1
+ }
+
+ if (! ~ $#* 0 1 2) {
+ echo usage: $0 '[egrep pattern] [sed command]' >[1=2]
+ return 1
+ }
+
+ command=`{
+ egrep -v '^[ ]*p([ ]+|$)' $history | switch ($#*) {
+ case 0
+ cat
+ case 1
+ egrep $1
+ case 2
+ egrep $1 | sed $2
+ } | tail -1
+ }
+
+ echo $command
+ eval $command
+}
+
+if (~ $TERM dialup network) {
+ TERM=vt100
+ biff y
+}
+
+A front-end to NeXT's "openfile"
+--------------------------------
+
+Named after the sam "B" command for opening a file, this script was written
+by Paul Haahr. (Assumes the "pick" command from Kernighan and Pike is also
+in your path.)
+
+#!/bin/rc
+if (~ $#* 0)
+ exec openfile
+create = ()
+files = ()
+for (i in $*)
+ if (test -f $i) {
+ files = ($files $i)
+ } else {
+ create = ($create $i)
+ }
+create = `{ pick $create }
+files = ($files $create)
+for (i in $create)
+ > $i
+if (! ~ $#files 0)
+ openfile $files
+
+A read function
+---------------
+
+Unlike sh, rc doesn't have a read. This clever alternative returns an
+exit status as well as fetch a variable. Use as
+
+ read foo
+
+to set $foo to a single line from the terminal.
+
+(due to John Mackin <john@syd.dit.csiro.au>)
+
+fn read {
+ x=() {
+ x = `` ($nl) { awk '{print; print 0; exit}' ^ $nl ^ \
+ 'END {print 1; print 1}' }
+ $1 = $x(1)
+ return $x(2)
+ }
+}
+
+From cs.wisc.edu!dws Fri Aug 2 18:16:14 1991
+
+#-------
+# ls front end
+#-------
+fn ls \
+{
+ test -t 1 && * = (-FCb $*)
+ builtin ls $*
+}
+#-------
+# nl - holds a newline, useful in certain command substitutions
+#-------
+nl='
+'
+#-------
+# show - tell me about a name
+#
+# Runs possibly dangerous things through cat -v in order to protect
+# me from the effects of control characters I might have in the
+# environment.
+#-------
+fn show \
+{
+ * = `` $nl {whatis -- $*}
+ for(itis)
+ {
+ switch($^itis)
+ {
+ case 'fn '* ; echo $itis | cat -v -t
+ case builtin* ; echo $itis
+ case /* ; file $itis; ls -ld $itis
+ case *'='* ; echo $itis | cat -v -t
+ case * ; echo $itis: UNKNOWN: update show
+ }
+ }
+ itis = ()
+}
+#-------
+# Tell me automatically when a command has a nonzero status.
+#-------
+fn prompt \
+{
+ Status = $status
+ ~ $Status 0 || echo '[status '$Status']'
+}
+
+#-------
+# chop - echo the given list, less its final member
+#
+# e.g. chop (a b c) -> (a b)
+#-------
+fn chop {
+ ~ $#* 0 1 && return 0
+ ans = '' { # local variable
+ ans = ()
+ while(! ~ $#* 1)
+ {
+ ans = ($ans $1)
+ shift
+ }
+ echo $ans
+ }
+}
+
+From arnold@audiofax.com Thu May 30 08:49:51 1991
+
+# cd.rc --- souped up version of cd
+
+# this is designed to emulate the fancy version of cd in ksh,
+# so if you're a purist, feel free to gag
+
+_cwd=$home
+_oldcwd=$home
+
+fn cd {
+ if (~ $#* 0) {
+ if (~ $_cwd $home) { # do nothing
+ } else {
+ builtin cd && { _oldcwd=$_cwd ; _cwd=$home }
+ }
+ } else if (~ $#* 1) {
+ if (~ $1 -) {
+ _t=$_cwd
+ builtin cd $_oldcwd && {
+ _cwd=$_oldcwd
+ _oldcwd=$_t
+ echo $_cwd
+ }
+ _t=()
+ } else {
+ # if a cd happens through the cdpath, rc echos
+ # the directory on its own. all we have to do
+ # is track where we end up
+ _dopwd = 1
+ { ~ $1 /* } && _dopwd = 0 # absolute path
+ builtin cd $1 && {
+ _oldcwd=$_cwd
+ _cwd=$1
+ { ~ $_dopwd 1 } && _cwd=`/bin/pwd
+ }
+ _dopwd=()
+ }
+ } else if (~ $#* 2) {
+ _t=`{ echo $_cwd | sed 's<'$1'<'$2'<' }
+ builtin cd $_t && {
+ _oldcwd=$_cwd
+ _cwd=$_t
+ echo $_cwd
+ }
+ _t=()
+ } else {
+ echo cd: takes 0, 1, or 2 arguments >[1=2]
+ builtin cd $1 && { _oldcwd=$_cwd ; _cwd=`/bin/pwd ; echo $_cwd }
+ }
+}
+
+fn pwd { echo $_cwd }
+
+From vlsi.cs.caltech.edu!drazen Tue Jan 21 16:03:14 1992
+
+# A kill builtin.
+
+#ifdef B_KILL
+#include <ctype.h>
+static void b_kill(char **av)
+{
+ int signal = SIGTERM;
+ int n = 1;
+ pid_t pid;
+ boolean res;
+
+ if (!av[1]) {
+ set(TRUE);
+ return;
+ }
+#undef STRCMP
+#define STRCMP strcmp
+ if ( '-' == av[1][0]) {
+ char *p = 1+av[1];
+ if (0 == strcmp(av[1], "-l")){
+ int r; const int nsig = NUMOFSIGNALS;
+ const int C = 4, R = 1 + (int)((nsig-2)/C);
+ for (r=1; r<=R; r++){
+ int j;
+ for (j=r; j<nsig; j+=R){
+ fprint(1, "%s%d. %s\t", j<10?" ":"", j, signals[j][0]);
+ }
+ fprint(1,"\n");
+ }
+ set(TRUE);
+ return;
+ }
+ n++;
+ if ( (signal=a2u(p)) < 0){
+ int i;
+ for (i = 1; i < NUMOFSIGNALS; i++){
+ char UPPER[31], *u=UPPER, *q;
+ for (q=signals[i][0]; *q; q++, u++) *u = toupper(*q);
+ *u = '\0';
+
+ if (*signals[i][0] &&
+ (!STRCMP(signals[i][0], p) || !STRCMP(3+signals[i][0],p)
+ || !STRCMP(UPPER, p) || !STRCMP(3+UPPER, p) ) )
+ {
+ signal = i;
+ break;
+ }
+ }
+ if (signal < 0){
+ fprint(2,"kill: bad signal %s\n", av[1]);
+ set(FALSE);
+ return;
+ }
+ }
+ }
+#undef STRCMP
+
+ for (res=TRUE; av[n]; n++){
+ if( (pid = (pid_t) a2u(av[n])) < 0){
+ fprint(2, "kill: bad process number %s\n", av[n]);
+ res = FALSE;
+ continue;
+ }
+ if (kill(pid,signal)){
+ uerror("kill");
+ res = FALSE;
+ continue;
+ }
+ }
+ set(res);
+}
+#endif
+From acc.stolaf.edu!quanstro Thu Apr 2 02:51:10 1992
+Received: from thor.acc.stolaf.edu ([130.71.192.1]) by archone.tamu.edu with SMTP id <45339>; Thu, 2 Apr 1992 02:50:56 -0600
+Received: by thor.acc.stolaf.edu; Thu, 2 Apr 92 02:49:31 -0600
+Date: Thu, 2 Apr 1992 02:49:31 -0600
+From: quanstro@acc.stolaf.edu
+Message-Id: <9204020849.AA26566@thor.acc.stolaf.edu>
+To: byron@archone.tamu.edu
+Subject: EXAMPLES in 1.4beta
+Status: RO
+
+
+I have a little bit of code which might be a little more general than
+the souped-up version that is already there. Here it is, if you are
+interested.
+
+# directory functions ###################################################
+fn pwd { echo $PWD; }
+
+fn pushd {
+ dirs = ($PWD $dirs);
+ builtin cd $*;
+ PWD = `{builtin pwd};
+}
+
+fn popd {
+ switch ($#*)
+ {
+ case 0
+ ;
+ case 1
+ echo 'popd: argument '^$1^' ignored.' >[1=2];
+ case *
+ echo 'popd: usage: popd [n].';
+ }
+
+ if (! ~ $dirs ())
+ {
+ builtin cd $dirs(1);
+ PWD = $dirs(1);
+ echo $PWD;
+ * = $dirs;
+ shift
+ dirs = $*;
+ }
+}
+
+fn cd {
+ ~ $* () && * = $home;
+ !~ $#* 1 && echo 'cd: too many arguments' >[1=2] && return 1;
+
+ if (test -r $* ) {
+ pushd $*;
+ } else {
+ echo cd: $* does not exist. >[1=2]
+ return 1;
+ }
+}
+
+fn back { popd $*; }
+
+fn Back {
+ cd $home;
+ PWD = $home;
+ dirs = ();
+}
+
+fn dirs {
+ echo $dirs;
+}
+
+PWD = `{builtin pwd} ; dirs = $PWD # kickstart
+
+
+
+
+
+From acc.stolaf.edu!quanstro Thu Apr 2 02:53:40 1992
+Received: from thor.acc.stolaf.edu ([130.71.192.1]) by archone.tamu.edu with SMTP id <45339>; Thu, 2 Apr 1992 02:53:38 -0600
+Received: by thor.acc.stolaf.edu; Thu, 2 Apr 92 02:51:46 -0600
+Date: Thu, 2 Apr 1992 02:51:46 -0600
+From: quanstro@acc.stolaf.edu
+Message-Id: <9204020851.AA26573@thor.acc.stolaf.edu>
+To: byron@archone.tamu.edu
+Subject: EXAMPLES
+Status: RO
+
+
+Little yp hack which act's like ~ w/o syntatic sugar (for those who do
+not have the luxury of seting up symbolic links to all user's homes
+
+# user function #########################################################
+fn u user {
+ info = ()
+ info = `` (':') {ypmatch $1 passwd >[2] /dev/null }
+
+ if (~ $info ()) {
+ echo user $1 unknown >[1=2];
+ return 1;
+ } else {
+ echo $info(6)
+ if (~ $0 user)
+ cd $info(6)
+ }
+}
+
+
+From stolaf.edu!quanstro Sun Apr 5 04:53:34 1992
+Date: Sun, 5 Apr 1992 04:53:08 -0500
+From: quanstro@stolaf.edu (Erik Quanstrom)
+To: byron@archone.tamu.edu
+Subject: man written in rc
+Status: RO
+
+I whipped this up because the NeXTs here insist on using MANPAGER
+instead of PAGER and otherwise being obnoxious . . .
+
+Anyway ... I hope you approve
+
+#!/bin/rc
+#########################################################################
+# file: man #
+# #
+# object: display man pages #
+# #
+# bugs: * slow #
+# * does not know about fmt files #
+# #
+# Erik Quanstrom #
+# 11. Februar 1992 #
+#########################################################################
+PATH=/bin:/usr/bin:/usr/ucb:/usr/local/bin:$PATH ;
+TROFF = (nroff -hq -Tcrt);
+macros=an;
+sections=(cat1 cat2 cat3 cat4 cat5 cat6 cat7 cat8 catl man1 man2 man3 man4 \
+ man5 man6 man7 man8 manl)
+$nl='
+'
+fn sigint sighup sigquit sigalrm sigterm { rm -f $Bat; exit 2;}
+
+fn usage {
+ echo usage: $0 [-] [-t] [-M path] [-T macros] [[section] title] ...>[1=2];
+ exit 1;
+}
+
+n=();
+fn shiftn {
+ n=($n 1)
+}
+
+~ $PAGER () && test -t 1 && PAGER=more; #default pager
+
+while (~ $1 -*)
+ {
+ switch ($1)
+ {
+ case -
+ if (~ $PAGER troff)
+ echo bad combination of flags >[1=2] && usage;
+ PAGER=cat;
+ case -t
+ ~ TROFF () && TROFF = (troff -t);
+ ~ TCAT () && PAGER=(lpr -t);
+ case -M
+ shift;
+ ~ $1 () && usage;
+
+ MANPATH=$1;
+ case -T
+ shift;
+ ~ $1 () && usage;
+ macros=$1;
+ case -k
+ fflag=(); kflag=1;
+ shift;
+ break;
+ case -f
+ # locate related too filenames
+ kflag=(); fflag=1;
+ shift;
+ break;
+ case -*
+ echo bad flag '`'^$1^'''' >[1=2];
+ usage;
+ }
+ shift;
+ }
+
+if (!~ $#* 1) {
+ ~ $1 [l1-8] && { sname=$1 ; sections=(cat man)^$1 ; shift }
+ #hack for sun-style man pages
+ ~ $1 [l1-8]? && { sname=$1 ; sections=(cat man)^`{echo $1| cut -c1} ; shift }
+}
+
+if (~ 1 $fflag $kflag) {
+ dirlist=();
+ for (d in ``(:$nl) {echo $MANPATH})
+ test -s $d^/whatis && dirlist=($dirlist $d^/whatis);
+
+ ~ $1 () && usage;
+
+ if (~ $fflag 1) {
+ while (!~ $1 ()) {
+ cmd=`{echo $1 | sed 's/^.*\///g'}
+ egrep -h '^'^$cmd' ' $dirlist;
+ shift;
+ }
+ } else {
+ while (!~ $1 ()) {
+ grep -h $1 $dirlist;
+ shift;
+ }
+ }
+ exit 0;
+}
+
+s=0;
+while (!~ $1 ()) {
+ for (dir in ``(:$nl) {echo $MANPATH}) {
+ filelist=($filelist `{echo $dir/^$sections^/$1^.* |\
+ tr ' ' '\12' | grep -v '*'})
+
+ # coment this out if you don't care about speed, but
+ # would rather find all the pages.
+ ~ $filelist () || break;
+ }
+
+ if (~ $filelist ()) {
+ if (~ $#sections 2) {
+ echo no entry for $1 in section '`'$sname'''' of the manual >[1=2];
+ } else {
+ echo no entry for '`'$1'''' found. >[1=2];
+ }
+ s=1;
+ } else {
+
+ echo $filelist '(' $#filelist ')' >[1=2];
+
+ for (file in $filelist) {
+ if (~ $file */cat[1-8l]/*) {
+ Cat = ($Cat $file);
+ } else {
+ # search for dups
+ dont=()
+ for (x in $Cat) {
+ if (~ `{echo $x | sed 's/\/[mc]a[nt][1-8l]//'} \
+ `{echo $file | sed 's/\/[mc]a[nt][1-8l]//'}) {
+ dont=1;
+ break;
+ }
+ }
+
+ if (~ $dont ()) {
+ cd `{echo $file | sed 's/man[1-8].*//'}
+ echo -n Formatting ...
+ $TROFF -m^$macros $file > /tmp/man^$pid^$#n && \
+ Bat = ($Bat /tmp/man^$pid^$#n)
+
+ shiftn;
+ echo ' 'done.
+ }
+ }
+ }
+ }
+ shift;
+}
+
+{ !~ () $Cat || !~ () $Bat } && $PAGER $Cat $Bat;
+
+rm -f $Bat;
+~ $s () || exit $s;
+
+exit 0;
+
+
+
+From osf.org!rsalz Thu Apr 23 16:22:32 1992
+Date: Thu, 23 Apr 1992 16:22:07 -0500
+From: rsalz@osf.org
+To: byron@archone.tamu.edu
+Subject: One for your EXAMPLES file
+Status: RO
+
+Use
+ trimhist [-#lines]
+trims your history file back; useful for folks with dis quota's :-)
+fn trimhist { p1=-100 {
+ cp $history $history^'~'
+ ~ $#* 1 && p1=$1
+ tail $p1 <$history^'~' >$history
+ rm $history^'~'
+} }
+
+From Pa.dec.com!uucp Mon Apr 27 12:25:02 1992
+Date: Mon, 27 Apr 1992 12:15:18 -0500
+From: haahr@adobe.com
+To: Byron Rakitzis <byron@archone.tamu.edu>
+Subject: a neat little rc script
+
+what you have to know to understand this:
+ $md for me is usually obj.$machine
+ my mkfiles build *.o, *.a, and the a.outs in $md
+ this is my acc script, which i use for compiling adobe routines
+---
+#! /user/haahr/bin/next/rc
+
+cc = cc
+proto = '-DPROTOTYPES=1'
+
+switch ($md) {
+case noproto.$machine; proto = '-DPROTOTYPES=0'
+case gprof.$machine; cc = ($cc -pg)
+case prof.$machine; cc = ($cc -p)
+case lcomp.$machine; cc = lcomp
+}
+exec $cc $proto '-DPACKAGE_SPECS="package.h"' '-DISP=isp_mc68020' '-DOS=os_mach' $*
+
+From rc-owner Tue May 12 14:54:10 1992
+Received: from postman.osf.org ([130.105.1.152]) by archone.tamu.edu with SMTP id <45337>; Tue, 12 May 1992 14:38:16 -0500
+Received: from earth.osf.org by postman.osf.org (5.64+/OSF 1.0)
+ id AA14480; Tue, 12 May 92 13:25:03 -0400
+Received: by earth.osf.org (5.64/4.7) id AA03499; Tue, 12 May 92 13:25:02 -0400
+Date: Tue, 12 May 1992 12:25:02 -0500
+From: rsalz@osf.org
+Message-Id: <9205121725.AA03499@earth.osf.org>
+To: rc@archone.tamu.edu
+Subject: Useful function
+Status: R
+
+It looks like line noise, but it turns things like
+ /home/rsalz/foo/bar
+into
+ ~/foo/bar
+
+Useful for when you put your current directory up in your icon title.
+By duplicating the $home section you can make things like
+ /project/dce/build/dce1.0.1/src/rpc
+become
+ $MYBT/src/rpc
+
+## If a pathname starts with $home, turn $home into ~. Uses all built-ins.
+fn tildepath { p1=() i=() {
+ p1=$1
+ switch ($p1) {
+ case $home $home/*
+ # Split arg into components
+ *=`` (/) { echo -n $p1 }
+ # Shift down by number of components in $home
+ for (i in `` (/) { echo -n $home } ) shift
+ # Glue back together
+ p1='~'
+ for (i) p1=$p1 ^ '/' ^ $i
+ echo $p1
+ case *
+ echo $p1
+ }
+ return 0
+} }
+
+From osf.org!rsalz Tue May 12 15:47:12 1992
+Received: from postman.osf.org ([130.105.1.152]) by archone.tamu.edu with SMTP id <45316>; Tue, 12 May 1992 15:47:06 -0500
+Received: from earth.osf.org by postman.osf.org (5.64+/OSF 1.0)
+ id AA21070; Tue, 12 May 92 16:46:58 -0400
+Received: by earth.osf.org (5.64/4.7) id AA09396; Tue, 12 May 92 16:46:56 -0400
+Date: Tue, 12 May 1992 15:46:56 -0500
+From: rsalz@osf.org
+Message-Id: <9205122046.AA09396@earth.osf.org>
+To: byron@archone.tamu.edu
+Subject: Re: Useful function
+Status: R
+
+>wow. thanks, i'll add it to EXAMPLES.
+Glad you like. Getting something added to EXAMPLES has been a goal of mine...
+
+I've been thinking, a bit, about a more general way of doing it. I want
+a "prefix-sub" function, like this
+ prefix $some_path var1 var2 var3 var4 var5
+That would take some_path and replace any leading $var1 (etc) values
+with the variable name. Return on the first match.
+
+Hmm -- come to think of it, that's very easy to do:
+
+# Use pathprefix filename var1 var2 var3
+# returns filename, with leading prefixes (in $var1...) turned into the
+# string $var1...
+fn pathprefix { p1=() i=() j=() {
+ p1=$1 ; shift
+ for (i) {
+ ~ $p1 $$i $$i^/* && {
+ *=`` (/) { echo -n $p1 }
+ for (j in `` (/) { echo -n $$i } ) shift
+ p1='$'^$i
+ for (j) p1=$p1 ^ '/' ^ $j
+ echo $p1
+ return 0
+ }
+ }
+ echo $p1
+ return 0
+} }
+
+home=/user/users/rsalz
+z=/usr/users
+pathprefix /usr/users/rsalz home usr # --> $home
+pathprefix /usr/users/rsalz z # --> $z/rsalz
+pathprefix /usr/users/rsalz/foo z home # --> $z/rsalz/foo
+pathprefix /usr/users/rsalz/foo home # --> $home/foo
+
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