| Current Path : /compat/linux/proc/self/root/usr/bin/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //compat/linux/proc/self/root/usr/bin/whatis |
#! /bin/sh
#
# Copyright (c) 2010 Gordon Tetlow
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# $FreeBSD: release/9.1.0/usr.bin/man/man.sh 222653 2011-06-03 14:34:38Z ru $
# Usage: add_to_manpath path
# Adds a variable to manpath while ensuring we don't have duplicates.
# Returns true if we were able to add something. False otherwise.
add_to_manpath() {
case "$manpath" in
*:$1) decho " Skipping duplicate manpath entry $1" 2 ;;
$1:*) decho " Skipping duplicate manpath entry $1" 2 ;;
*:$1:*) decho " Skipping duplicate manpath entry $1" 2 ;;
*) if [ -d "$1" ]; then
decho " Adding $1 to manpath"
manpath="$manpath:$1"
return 0
fi
;;
esac
return 1
}
# Usage: build_manlocales
# Builds a correct MANLOCALES variable.
build_manlocales() {
# If the user has set manlocales, who are we to argue.
if [ -n "$MANLOCALES" ]; then
return
fi
parse_configs
# Trim leading colon
MANLOCALES=${manlocales#:}
decho "Available manual locales: $MANLOCALES"
}
# Usage: build_manpath
# Builds a correct MANPATH variable.
build_manpath() {
local IFS
# If the user has set a manpath, who are we to argue.
if [ -n "$MANPATH" ]; then
return
fi
search_path
decho "Adding default manpath entries"
IFS=:
for path in $man_default_path; do
add_to_manpath "$path"
done
unset IFS
parse_configs
# Trim leading colon
MANPATH=${manpath#:}
decho "Using manual path: $MANPATH"
}
# Usage: check_cat catglob
# Checks to see if a cat glob is available.
check_cat() {
if exists "$1"; then
use_cat=yes
catpage=$found
setup_cattool $catpage
decho " Found catpage $catpage"
return 0
else
return 1
fi
}
# Usage: check_man manglob catglob
# Given 2 globs, figures out if the manglob is available, if so, check to
# see if the catglob is also available and up to date.
check_man() {
if exists "$1"; then
# We have a match, check for a cat page
manpage=$found
setup_cattool $manpage
decho " Found manpage $manpage"
if [ -n "${use_width}" ]; then
# non-standard width
unset use_cat
decho " Skipping catpage: non-standard page width"
elif exists "$2" && is_newer $found $manpage; then
# cat page found and is newer, use that
use_cat=yes
catpage=$found
setup_cattool $catpage
decho " Using catpage $catpage"
else
# no cat page or is older
unset use_cat
decho " Skipping catpage: not found or old"
fi
return 0
fi
return 1
}
# Usage: decho "string" [debuglevel]
# Echoes to stderr string prefaced with -- if high enough debuglevel.
decho() {
if [ $debug -ge ${2:-1} ]; then
echo "-- $1" >&2
fi
}
# Usage: exists glob
# Returns true if glob resolves to a real file.
exists() {
local IFS
# Don't accidentally inherit callers IFS (breaks perl manpages)
unset IFS
# Use some globbing tricks in the shell to determine if a file
# exists or not.
set +f
set -- "$1" $1
set -f
if [ "$1" != "$2" -a -r "$2" ]; then
found="$2"
return 0
fi
return 1
}
# Usage: find_file path section subdir pagename
# Returns: true if something is matched and found.
# Search the given path/section combo for a given page.
find_file() {
local manroot catroot mann man0 catn cat0
manroot="$1/man$2"
catroot="$1/cat$2"
if [ -n "$3" ]; then
manroot="$manroot/$3"
catroot="$catroot/$3"
fi
if [ ! -d "$manroot" ]; then
return 1
fi
decho " Searching directory $manroot" 2
mann="$manroot/$4.$2*"
man0="$manroot/$4.0*"
catn="$catroot/$4.$2*"
cat0="$catroot/$4.0*"
# This is the behavior as seen by the original man utility.
# Let's not change that which doesn't seem broken.
if check_man "$mann" "$catn"; then
return 0
elif check_man "$man0" "$cat0"; then
return 0
elif check_cat "$catn"; then
return 0
elif check_cat "$cat0"; then
return 0
fi
return 1
}
# Usage: is_newer file1 file2
# Returns true if file1 is newer than file2 as calculated by mtime.
is_newer() {
if ! [ "$1" -ot "$2" ]; then
decho " mtime: $1 not older than $2" 3
return 0
else
decho " mtime: $1 older than $2" 3
return 1
fi
}
# Usage: manpath_parse_args "$@"
# Parses commandline options for manpath.
manpath_parse_args() {
local cmd_arg
while getopts 'Ldq' cmd_arg; do
case "${cmd_arg}" in
L) Lflag=Lflag ;;
d) debug=$(( $debug + 1 )) ;;
q) qflag=qflag ;;
*) manpath_usage ;;
esac
done >&2
}
# Usage: manpath_usage
# Display usage for the manpath(1) utility.
manpath_usage() {
echo 'usage: manpath [-Ldq]' >&2
exit 1
}
# Usage: manpath_warnings
# Display some warnings to stderr.
manpath_warnings() {
if [ -z "$Lflag" -a -n "$MANPATH" ]; then
echo "(Warning: MANPATH environment variable set)" >&2
fi
if [ -n "$Lflag" -a -n "$MANLOCALES" ]; then
echo "(Warning: MANLOCALES environment variable set)" >&2
fi
}
# Usage: man_check_for_so page path
# Returns: True if able to resolve the file, false if it ended in tears.
# Detects the presence of the .so directive and causes the file to be
# redirected to another source file.
man_check_for_so() {
local IFS line tstr
unset IFS
# We need to loop to accommodate multiple .so directives.
while true
do
line=$($cattool $manpage | head -1)
case "$line" in
.so*) trim "${line#.so}"
decho "$manpage includes $tstr"
# Glob and check for the file.
if ! check_man "$path/$tstr*" ""; then
decho " Unable to find $tstr"
return 1
fi
;;
*) break ;;
esac
done
return 0
}
# Usage: man_display_page
# Display either the manpage or catpage depending on the use_cat variable
man_display_page() {
local EQN NROFF PIC TBL TROFF REFER VGRIND
local IFS l nroff_dev pipeline preproc_arg tool
# We are called with IFS set to colon. This causes really weird
# things to happen for the variables that have spaces in them.
unset IFS
# If we are supposed to use a catpage and we aren't using troff(1)
# just zcat the catpage and we are done.
if [ -z "$tflag" -a -n "$use_cat" ]; then
if [ -n "$wflag" ]; then
echo "$catpage (source: $manpage)"
ret=0
else
if [ $debug -gt 0 ]; then
decho "Command: $cattool $catpage | $MANPAGER"
ret=0
else
eval "$cattool $catpage | $MANPAGER"
ret=$?
fi
fi
return
fi
# Okay, we are using the manpage, do we just need to output the
# name of the manpage?
if [ -n "$wflag" ]; then
echo "$manpage"
ret=0
return
fi
# So, we really do need to parse the manpage. First, figure out the
# device flag (-T) we have to pass to eqn(1) and groff(1). Then,
# setup the pipeline of commands based on the user's request.
# If the manpage is from a particular charset, we need to setup nroff
# to properly output for the correct device.
case "${manpage}" in
*.${man_charset}/*)
# I don't pretend to know this; I'm just copying from the
# previous version of man(1).
case "$man_charset" in
KOI8-R) nroff_dev="koi8-r" ;;
ISO8859-1) nroff_dev="latin1" ;;
ISO8859-15) nroff_dev="latin1" ;;
UTF-8) nroff_dev="utf8" ;;
*) nroff_dev="ascii" ;;
esac
NROFF="$NROFF -T$nroff_dev"
EQN="$EQN -T$nroff_dev"
# Iff the manpage is from the locale and not just the charset,
# then we need to define the locale string.
case "${manpage}" in
*/${man_lang}_${man_country}.${man_charset}/*)
NROFF="$NROFF -dlocale=$man_lang.$man_charset"
;;
*/${man_lang}.${man_charset}/*)
NROFF="$NROFF -dlocale=$man_lang.$man_charset"
;;
esac
# Allow language specific calls to override the default
# set of utilities.
l=$(echo $man_lang | tr [:lower:] [:upper:])
for tool in EQN NROFF PIC TBL TROFF REFER VGRIND; do
eval "$tool=\${${tool}_$l:-\$$tool}"
done
;;
*) NROFF="$NROFF -Tascii"
EQN="$EQN -Tascii"
;;
esac
if [ -z "$MANCOLOR" ]; then
NROFF="$NROFF -P-c"
fi
if [ -n "${use_width}" ]; then
NROFF="$NROFF -rLL=${use_width}n -rLT=${use_width}n"
fi
if [ -n "$MANROFFSEQ" ]; then
set -- -$MANROFFSEQ
while getopts 'egprtv' preproc_arg; do
case "${preproc_arg}" in
e) pipeline="$pipeline | $EQN" ;;
g) ;; # Ignore for compatability.
p) pipeline="$pipeline | $PIC" ;;
r) pipeline="$pipeline | $REFER" ;;
t) pipeline="$pipeline | $TBL" ;;
v) pipeline="$pipeline | $VGRIND" ;;
*) usage ;;
esac
done
# Strip the leading " | " from the resulting pipeline.
pipeline="${pipeline#" | "}"
else
pipeline="$TBL"
fi
if [ -n "$tflag" ]; then
pipeline="$pipeline | $TROFF"
else
pipeline="$pipeline | $NROFF | $MANPAGER"
fi
if [ $debug -gt 0 ]; then
decho "Command: $cattool $manpage | $pipeline"
ret=0
else
eval "$cattool $manpage | $pipeline"
ret=$?
fi
}
# Usage: man_find_and_display page
# Search through the manpaths looking for the given page.
man_find_and_display() {
local found_page locpath p path sect
# Check to see if it's a file. But only if it has a '/' in
# the filename.
case "$1" in
*/*) if [ -f "$1" -a -r "$1" ]; then
decho "Found a usable page, displaying that"
unset use_cat
manpage="$1"
setup_cattool $manpage
if man_check_for_so $manpage $(dirname $manpage); then
found_page=yes
man_display_page
fi
return
fi
;;
esac
IFS=:
for sect in $MANSECT; do
decho "Searching section $sect" 2
for path in $MANPATH; do
for locpath in $locpaths; do
p=$path/$locpath
p=${p%/.} # Rid ourselves of the trailing /.
# Check if there is a MACHINE specific manpath.
if find_file $p $sect $MACHINE "$1"; then
if man_check_for_so $manpage $p; then
found_page=yes
man_display_page
if [ -n "$aflag" ]; then
continue 2
else
return
fi
fi
fi
# Check if there is a MACHINE_ARCH
# specific manpath.
if find_file $p $sect $MACHINE_ARCH "$1"; then
if man_check_for_so $manpage $p; then
found_page=yes
man_display_page
if [ -n "$aflag" ]; then
continue 2
else
return
fi
fi
fi
# Check plain old manpath.
if find_file $p $sect '' "$1"; then
if man_check_for_so $manpage $p; then
found_page=yes
man_display_page
if [ -n "$aflag" ]; then
continue 2
else
return
fi
fi
fi
done
done
done
unset IFS
# Nothing? Well, we are done then.
if [ -z "$found_page" ]; then
echo "No manual entry for $1" >&2
ret=1
return
fi
}
# Usage: man_parse_args "$@"
# Parses commandline options for man.
man_parse_args() {
local IFS cmd_arg
while getopts 'M:P:S:adfhkm:op:tw' cmd_arg; do
case "${cmd_arg}" in
M) MANPATH=$OPTARG ;;
P) MANPAGER=$OPTARG ;;
S) MANSECT=$OPTARG ;;
a) aflag=aflag ;;
d) debug=$(( $debug + 1 )) ;;
f) fflag=fflag ;;
h) man_usage 0 ;;
k) kflag=kflag ;;
m) mflag=$OPTARG ;;
o) oflag=oflag ;;
p) MANROFFSEQ=$OPTARG ;;
t) tflag=tflag ;;
w) wflag=wflag ;;
*) man_usage ;;
esac
done >&2
shift $(( $OPTIND - 1 ))
# Check the args for incompatible options.
case "${fflag}${kflag}${tflag}${wflag}" in
fflagkflag*) echo "Incompatible options: -f and -k"; man_usage ;;
fflag*tflag*) echo "Incompatible options: -f and -t"; man_usage ;;
fflag*wflag) echo "Incompatible options: -f and -w"; man_usage ;;
*kflagtflag*) echo "Incompatible options: -k and -t"; man_usage ;;
*kflag*wflag) echo "Incompatible options: -k and -w"; man_usage ;;
*tflagwflag) echo "Incompatible options: -t and -w"; man_usage ;;
esac
# Short circuit for whatis(1) and apropos(1)
if [ -n "$fflag" ]; then
do_whatis "$@"
exit
fi
if [ -n "$kflag" ]; then
do_apropos "$@"
exit
fi
IFS=:
for sect in $man_default_sections; do
if [ "$sect" = "$1" ]; then
decho "Detected manual section as first arg: $1"
MANSECT="$1"
shift
break
fi
done
unset IFS
pages="$*"
}
# Usage: man_setup
# Setup various trivial but essential variables.
man_setup() {
# Setup machine and architecture variables.
if [ -n "$mflag" ]; then
MACHINE_ARCH=${mflag%%:*}
MACHINE=${mflag##*:}
fi
if [ -z "$MACHINE_ARCH" ]; then
MACHINE_ARCH=$($SYSCTL -n hw.machine_arch)
fi
if [ -z "$MACHINE" ]; then
MACHINE=$($SYSCTL -n hw.machine)
fi
decho "Using architecture: $MACHINE_ARCH:$MACHINE"
setup_pager
# Setup manual sections to search.
if [ -z "$MANSECT" ]; then
MANSECT=$man_default_sections
fi
decho "Using manual sections: $MANSECT"
build_manpath
man_setup_locale
man_setup_width
}
# Usage: man_setup_width
# Set up page width.
man_setup_width() {
local sizes
unset use_width
case "$MANWIDTH" in
[0-9]*)
if [ "$MANWIDTH" -gt 0 2>/dev/null ]; then
use_width=$MANWIDTH
fi
;;
[Tt][Tt][Yy])
if { sizes=$($STTY size 0>&3 2>/dev/null); } 3>&1; then
set -- $sizes
if [ $2 -gt 80 ]; then
use_width=$(($2-2))
fi
fi
;;
esac
if [ -n "$use_width" ]; then
decho "Using non-standard page width: ${use_width}"
else
decho 'Using standard page width'
fi
}
# Usage: man_setup_locale
# Setup necessary locale variables.
man_setup_locale() {
local lang_cc
locpaths='.'
man_charset='US-ASCII'
# Setup locale information.
if [ -n "$oflag" ]; then
decho 'Using non-localized manpages'
else
# Use the locale tool to give us the proper LC_CTYPE
eval $( $LOCALE )
case "$LC_CTYPE" in
C) ;;
POSIX) ;;
[a-z][a-z]_[A-Z][A-Z]\.*)
lang_cc="${LC_CTYPE%.*}"
man_lang="${LC_CTYPE%_*}"
man_country="${lang_cc#*_}"
man_charset="${LC_CTYPE#*.}"
locpaths="$LC_CTYPE"
locpaths="$locpaths:$man_lang.$man_charset"
if [ "$man_lang" != "en" ]; then
locpaths="$locpaths:en.$man_charset"
fi
locpaths="$locpaths:."
;;
*) echo 'Unknown locale, assuming C' >&2
;;
esac
fi
decho "Using locale paths: $locpaths"
}
# Usage: man_usage [exitcode]
# Display usage for the man utility.
man_usage() {
echo 'Usage:'
echo ' man [-adho] [-t | -w] [-M manpath] [-P pager] [-S mansect]'
echo ' [-m arch[:machine]] [-p [eprtv]] [mansect] page [...]'
echo ' man -f page [...] -- Emulates whatis(1)'
echo ' man -k page [...] -- Emulates apropos(1)'
# When exit'ing with -h, it's not an error.
exit ${1:-1}
}
# Usage: parse_configs
# Reads the end-user adjustable config files.
parse_configs() {
local IFS file files
if [ -n "$parsed_configs" ]; then
return
fi
unset IFS
# Read the global config first in case the user wants
# to override config_local.
if [ -r "$config_global" ]; then
parse_file "$config_global"
fi
# Glob the list of files to parse.
set +f
files=$(echo $config_local)
set -f
for file in $files; do
if [ -r "$file" ]; then
parse_file "$file"
fi
done
parsed_configs='yes'
}
# Usage: parse_file file
# Reads the specified config files.
parse_file() {
local file line tstr var
file="$1"
decho "Parsing config file: $file"
while read line; do
decho " $line" 2
case "$line" in
\#*) decho " Comment" 3
;;
MANPATH*) decho " MANPATH" 3
trim "${line#MANPATH}"
add_to_manpath "$tstr"
;;
MANLOCALE*) decho " MANLOCALE" 3
trim "${line#MANLOCALE}"
manlocales="$manlocales:$tstr"
;;
MANCONFIG*) decho " MANCONFIG" 3
trim "${line#MANCONFIG}"
config_local="$tstr"
;;
# Set variables in the form of FOO_BAR
*_*[\ \ ]*) var="${line%%[\ \ ]*}"
trim "${line#$var}"
eval "$var=\"$tstr\""
decho " Parsed $var" 3
;;
esac
done < "$file"
}
# Usage: search_path
# Traverse $PATH looking for manpaths.
search_path() {
local IFS p path
decho "Searching PATH for man directories"
IFS=:
for path in $PATH; do
# Do a little special casing since the base manpages
# are in /usr/share/man instead of /usr/man or /man.
case "$path" in
/bin|/usr/bin) add_to_manpath "/usr/share/man" ;;
*) if add_to_manpath "$path/man"; then
:
elif add_to_manpath "$path/MAN"; then
:
else
case "$path" in
*/bin) p="${path%/bin}/man"
add_to_manpath "$p"
;;
*) ;;
esac
fi
;;
esac
done
unset IFS
if [ -z "$manpath" ]; then
decho ' Unable to find any manpaths, using default'
manpath=$man_default_path
fi
}
# Usage: search_whatis cmd [arglist]
# Do the heavy lifting for apropos/whatis
search_whatis() {
local IFS bad cmd f good key keywords loc opt out path rval wlist
cmd="$1"
shift
whatis_parse_args "$@"
build_manpath
build_manlocales
setup_pager
if [ "$cmd" = "whatis" ]; then
opt="-w"
fi
f='whatis'
IFS=:
for path in $MANPATH; do
if [ \! -d "$path" ]; then
decho "Skipping non-existent path: $path" 2
continue
fi
if [ -f "$path/$f" -a -r "$path/$f" ]; then
decho "Found whatis: $path/$f"
wlist="$wlist $path/$f"
fi
for loc in $MANLOCALES; do
if [ -f "$path/$loc/$f" -a -r "$path/$loc/$f" ]; then
decho "Found whatis: $path/$loc/$f"
wlist="$wlist $path/$loc/$f"
fi
done
done
unset IFS
if [ -z "$wlist" ]; then
echo "$cmd: no whatis databases in $MANPATH" >&2
exit 1
fi
rval=0
for key in $keywords; do
out=$(grep -Ehi $opt -- "$key" $wlist)
if [ -n "$out" ]; then
good="$good\\n$out"
else
bad="$bad\\n$key: nothing appropriate"
rval=1
fi
done
# Strip leading carriage return.
good=${good#\\n}
bad=${bad#\\n}
if [ -n "$good" ]; then
echo -e "$good" | $MANPAGER
fi
if [ -n "$bad" ]; then
echo -e "$bad" >&2
fi
exit $rval
}
# Usage: setup_cattool page
# Finds an appropriate decompressor based on extension
setup_cattool() {
case "$1" in
*.bz) cattool='/usr/bin/bzcat' ;;
*.bz2) cattool='/usr/bin/bzcat' ;;
*.gz) cattool='/usr/bin/zcat' ;;
*.lzma) cattool='/usr/bin/lzcat' ;;
*.xz) cattool='/usr/bin/xzcat' ;;
*) cattool='/usr/bin/zcat -f' ;;
esac
}
# Usage: setup_pager
# Correctly sets $MANPAGER
setup_pager() {
# Setup pager.
if [ -z "$MANPAGER" ]; then
if [ -n "$MANCOLOR" ]; then
MANPAGER="less -sR"
else
if [ -n "$PAGER" ]; then
MANPAGER="$PAGER"
else
MANPAGER="more -s"
fi
fi
fi
decho "Using pager: $MANPAGER"
}
# Usage: trim string
# Trims whitespace from beginning and end of a variable
trim() {
tstr=$1
while true; do
case "$tstr" in
[\ \ ]*) tstr="${tstr##[\ \ ]}" ;;
*[\ \ ]) tstr="${tstr%%[\ \ ]}" ;;
*) break ;;
esac
done
}
# Usage: whatis_parse_args "$@"
# Parse commandline args for whatis and apropos.
whatis_parse_args() {
local cmd_arg
while getopts 'd' cmd_arg; do
case "${cmd_arg}" in
d) debug=$(( $debug + 1 )) ;;
*) whatis_usage ;;
esac
done >&2
shift $(( $OPTIND - 1 ))
keywords="$*"
}
# Usage: whatis_usage
# Display usage for the whatis/apropos utility.
whatis_usage() {
echo "usage: $cmd [-d] keyword [...]"
exit 1
}
# Supported commands
do_apropos() {
search_whatis apropos "$@"
}
do_man() {
man_parse_args "$@"
if [ -z "$pages" ]; then
echo 'What manual page do you want?' >&2
exit 1
fi
man_setup
for page in $pages; do
decho "Searching for $page"
man_find_and_display "$page"
done
exit ${ret:-0}
}
do_manpath() {
manpath_parse_args "$@"
if [ -z "$qflag" ]; then
manpath_warnings
fi
if [ -n "$Lflag" ]; then
build_manlocales
echo $MANLOCALES
else
build_manpath
echo $MANPATH
fi
exit 0
}
do_whatis() {
search_whatis whatis "$@"
}
# User's PATH setting decides on the groff-suite to pick up.
EQN=eqn
NROFF='groff -S -P-h -Wall -mtty-char -man'
PIC=pic
REFER=refer
TBL=tbl
TROFF='groff -S -man'
VGRIND=vgrind
LOCALE=/usr/bin/locale
STTY=/bin/stty
SYSCTL=/sbin/sysctl
debug=0
man_default_sections='1:1aout:8:2:3:n:4:5:6:7:9:l'
man_default_path='/usr/share/man:/usr/share/openssl/man:/usr/local/man'
cattool='/usr/bin/zcat -f'
config_global='/etc/man.conf'
# This can be overridden via a setting in /etc/man.conf.
config_local='/usr/local/etc/man.d/*.conf'
# Set noglobbing for now. I don't want spurious globbing.
set -f
case "$0" in
*apropos) do_apropos "$@" ;;
*manpath) do_manpath "$@" ;;
*whatis) do_whatis "$@" ;;
*) do_man "$@" ;;
esac