4.4BSD/usr/src/contrib/rc-1.4/EXAMPLES
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
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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
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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
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id AA14480; Tue, 12 May 92 13:25:03 -0400
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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
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id AA21070; Tue, 12 May 92 16:46:58 -0400
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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