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#!/usr/bin/env bash
# Prepend arguments from a file to a command call
self=apf
# Require at least two arguments, give usage otherwise
if (($# < 2)) ; then
printf >&2 '%s: Need an arguments file and a command\n' "$self"
exit 2
fi
# First argument is the file containing the null-delimited arguments
argfile=$1
shift
# Check the arguments file makes sense
if [[ ! -e $argfile ]] ; then
printf '%s: %s: No such file or directory\n' \
"$self" "$argfile"
exit 1
elif [[ -d $argfile ]] ; then
printf '%s: %s: Is a directory\n' \
"$self" "$argfile"
exit 1
elif [[ ! -r $argfile ]] ; then
printf '%s: %s: Permission denied\n' \
"$self" "$argfile"
exit 1
fi
# Read all the null-delimited arguments from the file
declare -a args
while IFS= read -rd '' arg ; do
args[${#args[@]}]=$arg
done < "$argfile"
# Next argument is the command to run
cmd=$1
shift
# Run the command with the retrieved arguments first, then the rest of the
# command line as passed to the function
command "$cmd" "${args[@]}" "$@"
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