99 lines
1.9 KiB
Bash
99 lines
1.9 KiB
Bash
#!/bin/sh
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#
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# apropos -- search the whatis database for keywords.
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#
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# Copyright (c) February 1996 Wolfram Schneider <wosch@FreeBSD.org>. Berlin.
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# Copyright (c) 1990, 1991, John W. Eaton.
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#
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# You may distribute under the terms of the GNU General Public
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# License as specified in the README file that comes with the man
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# distribution.
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#
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# John W. Eaton
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# jwe@che.utexas.edu
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# Department of Chemical Engineering
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# The University of Texas at Austin
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# Austin, Texas 78712
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#
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# $Id: apropos.sh,v 1.6 1996/09/14 23:20:33 wosch Exp $
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PATH=/bin:/usr/bin:$PATH
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db=whatis # name of whatis data base
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grepopt=''
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# man -k complain if exit_nomatch=1 and no keyword matched
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: ${exit_nomatch=0}
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exit_error=2
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# argument test
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case $# in 0)
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echo "usage: `basename $0` keyword ..." >&2
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exit $exit_error
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;;
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esac
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case "$0" in
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*whatis) grepopt='-w';; # run as whatis(1)
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*) grepopt='';; # otherwise run as apropos(1)
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esac
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# test manpath
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manpath=`%bindir%/manpath -q | tr : '\040'`
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case X"$manpath" in X)
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echo "`basename $0`: manpath is null, use \"/usr/share/man\"" >&2
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manpath=/usr/share/man
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;;
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esac
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# reset $PAGER if $PAGER is empty
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case X"$PAGER" in X)
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PAGER="%pager%"
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;;
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esac
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# search for existing */whatis databases
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mandir=''
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for d in $manpath
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do
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if [ -f "$d/$db" -a -r "$d/$db" ]
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then
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mandir="$mandir $d/$db"
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fi
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done
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case X"$mandir" in X)
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echo "`basename $0`: no whatis databases in $manpath" >&2
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exit $exit_error
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esac
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for manpage
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do
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if grep -hi $grepopt -- "$manpage" $mandir; then :
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else
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echo "$manpage: nothing appropriate"
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fi
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done |
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( # start $PAGER only if we find a manual page
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while read line
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do
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case $line in
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# collect error(s)
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*": nothing appropriate") line2="$line2$line\n";;
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# matched line or EOF
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*) break;;
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esac
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done
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# nothing found, exit
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if test -z "$line" -a ! -z "$line2"; then
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printf -- "$line2"
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exit $exit_nomatch
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else
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( printf -- "$line2"; echo $line; cat ) | $PAGER
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fi
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)
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