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--- linux_wiki:cron [2017/09/03 17:47]
billdozor [Cron - Relative Days]
+++ linux_wiki:cron [2019/05/25 23:50] (current)
@@ Line 143: / Line 143: @@
 In this example, we want a script to execute on the 1st, 2nd, and 3rd Tuesday of every month, with different arguments depending upon which Tuesday it is.
-  - Cron entry: Execute a date checker script every Tuesday
+  * Cron entry: Execute a date checker script every Tuesday
-    - Create the system wide cron entry (/etc/cron.d/automated_job)<code bash># .---------------- minute (0 - 59)
+    * Create the system wide cron entry (/etc/cron.d/automated_jobs)<code bash cron-automated-jobs># .---------------- minute (0 - 59)
 # |  .------------- hour (0 - 23)
 # |  |  .---------- day of month (1 - 31)
@@ Line 156: / Line 156: @@
 08 * * tue  root  /automation/automated-job-check.sh
 </code>
-  - Date checker script: Determine if the actual automated program should run and what arguments to send it.
-    - Create the date checker script (/automation/automated-job-check.sh)<code bash>#!/bin/bash
+  * Date checker script: Determine if the actual automated program should run and what arguments to send it.
+    * Create the date checker script (/automation/automated-job-check.sh)<code bash automated-job-check.sh>#!/bin/bash
 # Title: automated-job-check.sh
 # Description: Determine if an automated job should be run
@@ Line 171: / Line 172: @@
 # If today is Tuesday AND today is >=1 and <=21(1st,2nd,3rd Tue)
 if [[ "$(date '+%a')" == "Tue" ]] && [[ $(date +%-d) -ge 1 ]]; then
   # First Tue: Development Environment
   if [[ $(date +%-d) -le 7 ]]; then
@@ Line 195: / Line 197: @@
 echo -e "==== Log Ended: $(date) ====\n" >> ${log_file}
 </code>
-    - The above date checker script
+==== Other Date Check Examples ====
+A few other examples of date checker scripts with relative days before/after.
+\\
+**7 Days before the first Tuesday of the month**<code bash>#!/bin/bash
+# Title: automated-job-check.sh
+# Description: Determine if an automated job should be run
+# Script to execute:
+script="/automation/scripts/automated-job.py"
+# Log file
+log_file="/var/log/automation/automated-job-check_$(date +%Y%m).log"
+echo "==== Log Started: $(date) ====" >> ${log_file}
+# If today is Tuesday AND 7 days from now is >=1 and <=7(first Tue)
+if [[ "$(date '+%a')" == "Tue" ]] && [[ $(date +%-d -d "+7 days") -ge 1 ]]; then
+  if [[ $(date +%-d -d "+7 days") -le 7 ]]; then
+    echo ">> OK: Seven days from now is the first Tue of the Month; execute script(${script})." >> ${log_file}
+    ${script} 2>&1 >> ${log_file}
+  else
+    echo ">> NO-EXEC: Seven days from now is NOT the first Tue of the Month. Will NOT execute script(${script})." >> ${log_file}
+  fi
+else
+  echo ">> NO-EXEC: Seven days from now is NOT the first Tue of the Month. Will NOT execute script(${script})." >> ${log_file}
+fi
+echo -e "==== Log Ended: $(date) ====\n" >> ${log_file}
+</code>
+\\
+**2 Days after the third Tuesday of the month**<code bash>#!/bin/bash
+# Title: automated-job-check.sh
+# Description: Determine if an automated job should be run
+# Script to execute
+script="/automation/scripts/automated-job.py"
+# Log file
+log_file="/var/log/automation/automated-job-check_$(date +%Y%m).log"
+echo "==== Log Started: $(date) ====" >> ${log_file}
+# If today is Thursday AND two days ago was >=15 and <=21(third Tue)
+if [[ "$(date '+%a')" == "Thu" ]] && [[ $(date +%-d -d "-2 days") -ge 15 ]]; then
+  if [[ $(date +%-d -d "-2 days") -le 21 ]]; then
+    echo ">> OK: Two days ago was the third Tue of the Month; execute script(${script})." >> ${log_file}
+    ${script} 2>&1 >> ${log_file}
+  else
+    echo ">> NO-EXEC: Two days ago was NOT the third Tue of the Month. Will NOT execute script(${script})." >> ${log_file}
+  fi
+else
+  echo ">> NO-EXEC: Two days ago was NOT the third Tue of the Month. Will NOT execute script(${script})." >> ${log_file}
+fi
+echo -e "==== Log Ended: $(date) ====\n" >> ${log_file}
+</code>
 ----