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- #!/bin/bash
- # System-wide crontab file and cron job directory. Change these for your system.
- CRONTAB='/etc/crontab'
- CRONDIR='/etc/cron.d'
- # Single tab character. Annoyingly necessary.
- tab=$(echo -en "\t")
- # Given a stream of crontab lines, exclude non-cron job lines, replace
- # whitespace characters with a single space, and remove any spaces from the
- # beginning of each line.
- function clean_cron_lines() {
- while read line ; do
- echo "${line}" |
- egrep --invert-match '^($|\s*#|\s*[[:alnum:]_]+=)' |
- sed --regexp-extended "s/\s+/ /g" |
- sed --regexp-extended "s/^ //"
- done;
- }
- # Given a stream of cleaned crontab lines, echo any that don't include the
- # run-parts command, and for those that do, show each job file in the run-parts
- # directory as if it were scheduled explicitly.
- function lookup_run_parts() {
- while read line ; do
- match=$(echo "${line}" | egrep -o 'run-parts (-{1,2}\S+ )*\S+')
- if [[ -z "${match}" ]] ; then
- echo "${line}"
- else
- cron_fields=$(echo "${line}" | cut -f1-6 -d' ')
- cron_job_dir=$(echo "${match}" | awk '{print $NF}')
- if [[ -d "${cron_job_dir}" ]] ; then
- for cron_job_file in "${cron_job_dir}"/* ; do # */
- [[ -f "${cron_job_file}" ]] && echo "${cron_fields} ${cron_job_file}"
- done
- fi
- fi
- done;
- }
- # Temporary file for crontab lines.
- temp=$(mktemp) || exit 1
- # Add all of the jobs from the system-wide crontab file.
- cat "${CRONTAB}" | clean_cron_lines | lookup_run_parts >"${temp}"
- # Add all of the jobs from the system-wide cron directory.
- cat "${CRONDIR}"/* | clean_cron_lines >>"${temp}" # */
- # Add each user's crontab (if it exists). Insert the user's name between the
- # five time fields and the command.
- while read user ; do
- crontab -l -u "${user}" 2>/dev/null |
- clean_cron_lines |
- sed --regexp-extended "s/^((\S+ +){5})(.+)$/\1${user} \3/" >>"${temp}"
- done < <(cut --fields=1 --delimiter=: /etc/passwd)
- # Output the collected crontab lines. Replace the single spaces between the
- # fields with tab characters, sort the lines by hour and minute, insert the
- # header line, and format the results as a table.
- cat "${temp}" |
- sed --regexp-extended "s/^(\S+) +(\S+) +(\S+) +(\S+) +(\S+) +(\S+) +(.*)$/\1\t\2\t\3\t\4\t\5\t\6\t\7/" |
- sort --numeric-sort --field-separator="${tab}" --key=2,1 |
- sed "1i\mi\th\td\tm\tw\tuser\tcommand" |
- column -s"${tab}" -t
- rm --force "${temp}"
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