Get Jira issues for file from commit history

findIssueKeys.sh

#!/bin/bash
JIRA_BASE_URL="https:\/\/your.jira.com\/browse\/"

# --follow lists all commits for the particular file, even through renames
# %B is short for commit subject line + body
COMMIT_MESSAGES=$(git log --pretty=format:%B --follow -- $1)

# matches Jira issue keys, e.g. JIRA-123
PATTERN='([[:upper:]]+-[[:digit:]]+)'

# -e is pattern to match against; -E means to interpret regex as extended pattern; -o only prints the matched words
grep -E -e ${PATTERN} -o <<< ${COMMIT_MESSAGES} | sed -e "s/^/${JIRA_BASE_URL}/"