I want cron to be run in every 55 mins.I followed the link CronJob every 25 minutesand my crontab command is*/5 * * * * [ $(( $(date +%s) / 60 % 55 )) -eq 0 ] && wget http://localhost/sandbox/run-cron-jobbut I am getting error message in file /var/mail/rootFrom root@shashikanth-912  Wed May 20 10:55:01 2015Return-Path: <root@shashikanth-912>X-Original-To: rootDelivered-To: root@shashikanth-912Received: by shashikanth-912 (Postfix, from userid 0)        id DD3CE4006E; Wed, 20 May 2015 10:55:01 +0530 (IST)From: root@shashikanth-912 (Cron Daemon)To: root@shashikanth-912Subject: Cron <root@shashikanth-912> [ $(( $(date +Content-Type: text/plain; charset=ANSI_X3.4-1968X-Cron-Env: <SHELL=/bin/sh>X-Cron-Env: <HOME=/root>X-Cron-Env: <PATH=/usr/bin:/bin>X-Cron-Env: <LOGNAME=root>Message-Id: <20150520052501.DD3CE4006E@shashikanth-912>Date: Wed, 20 May 2015 10:55:01 +0530 (IST)/bin/sh: 1: Syntax error: end of file unexpected (expecting ))How to fix this problem.
Cron Job every 55 minutes
linux;cron
@Stphane Chazelas, Thanks for suggestion. I escaped the % with backslash. now its working.Working crontab command is */5 * * * * [ $(( $(date +\%s) / 60 \% 55 )) -eq 0 ] && wget http://localhost/sandbox/run-cron-job