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#!/usr/bin/env bash
#
# stbl(1) - Strip a trailing blank line from the given files with ed(1).
#
# -h gives help, -v prints the names of the files on stderr as they're
# processed.
#
# Author: Tom Ryder <tom@sanctum.geek.nz>
# Copyright: 2016
# License: Public domain
#
self=stbl
# Print usage information
usage() {
printf '%s: usage: %s [-hv] [--] FILE1 [FILE2...]\n' \
"$self" "$self"
}
# Flag for whether to print diagnostics to stderr or not; defaults to off
declare -i verbose
verbose=0
# Process options
while getopts 'hv' opt ; do
case $opt in
# -h: Print help
h)
usage
exit 0
;;
# -v: Print diagnostics to stderr
v)
verbose=1
;;
# Unknown option
\?)
usage >&2
exit 2
;;
esac
done
shift "$((OPTIND-1))"
# Check we have arguments left
if ! (($#)) ; then
usage >&2
exit 2
fi
# Check we have ed(1)
hash ed || exit
# Iterate through the arguments
for fn ; do
# If verbose is set, print what we're doing
((verbose)) && printf '%s: %s\n' \
"$self" "$fn" >&2
# Run the ed script to strip the trailing blank lines
ed -s -- "$fn" <<'EOF'
$g/^ *$/d
w
EOF
done
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