Gel4y Mini Shell

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File name : clevis
Content :
#!/bin/bash -e
# vim: set tabstop=8 shiftwidth=4 softtabstop=4 expandtab smarttab colorcolumn=80:
#
# Copyright (c) 2017 Red Hat, Inc.
# Author: Nathaniel McCallum <npmccallum@redhat.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#

function findexe() {
    [ $# -eq 1 ] || return 1
    while read -r -d: path; do
        [ -f "$path/$1" ] && [ -x "$path/$1" ] && echo "$path/$1" && return 0
    done <<< "$PATH:"
    return 1
}

cmd=clevis
input_commands="$cmd $@"
while [ $# -gt 0 ]; do
    [[ "$1" =~ ^- ]] && break
    cmd="$cmd-$1"
    shift

    exe="$(findexe "$cmd")" && exec "$exe" "$@"
done

exec >&2
if [ "$cmd" != "clevis" ];
then
    echo
    echo "Command '$input_commands' is invalid"
fi
echo
echo "Usage: clevis COMMAND [OPTIONS]"
echo

max=0
for f in "$0"-*; do
    [ -f "$f" ] && [ -x "$f" ] || continue
    f="${f##*/}"
    [ ${#f} -gt $max ] && max=${#f}
done

for f in "$0"-*; do
    [ -f "$f" ] && [ -x "$f" ] || continue
    summ="$("$f" --summary 2>/dev/null)" || continue
    f="${f##*/}"
    printf "  %-*s %s\n" "$max" "${f//-/ }" "$summ"
done

echo

exit 2