golib/cmd/sendsms/randomize.sh

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#!/bin/sh
set -e
set -u
g_csv="${1:-}"
fn_help() {
echo "USAGE"
echo " # sort -R ./list.csv > ./list.csv.bak"
echo " ./randomize.sh ./list.csv"
}
fn_tip() {
echo "IMPORTANT"
echo " Now go move the header back to the first row"
}
main() {
if test -z "${g_csv}" || ! test -s "${g_csv}"; then
>&2 fn_help
return 1
fi
if test -s "${g_csv}.randomized"; then
{
echo "${g_csv}.randomized already exists"
fn_tip
} >&2
return 1
fi
sort -R "${g_csv}" > "${g_csv}.randomized"
{
echo "wrote ${g_csv}.randomized"
fn_tip
} >&2
}
main