Search the git commit history for a string, with optional duration limit

git-search.sh

#!/bin/bash

if [ "$#" -lt 1 ]; then
    echo "Usage: $0 <search-string> [last X days]"
    exit 1
fi

if [ "$#" -eq 1 ]; then
    git --no-pager log --grep="$1"
else
    START_DATE=$(date --date="$2 days ago" '+%Y-%m-%d')
    git --no-pager log --since="$START_DATE" --grep="$1"
fi