Crontab notes
From MIPAV
Current crontab on build machine
[mccreedy@cake]~% crontab -l # crontab for mccreedy on cake.cit.nih.gov # mail output to me: MAILTO=mccreedy@mail.nih.gov # use zsh no matter what SHELL=/bin/zsh #JAVA_HOME=/home/mccreedy/lib/j2sdk1.4.2_08 #JAVACMD=/home/mccreedy/lib/j2sdk1.4.2_08/bin/java #JAVA_HOME=/home/mccreedy/lib/jdk1.5.0_06 JAVA_HOME=/home/mccreedy/lib/jdk1.6.0_02 #JAVACMD=/home/mccreedy/lib/jdk1.6.0_02/bin/java ANT_HOME=/home/mccreedy/bin/apache-ant-1.7.0 #PATH=$JAVA_HOME/bin:$ANT_HOME/bin:$PATH # script directory vars SCRIPTDIR=/home/mccreedy/bin/scripts PROJECTDIR=/home/mccreedy/projects 00 23 * * * $SCRIPTDIR/build/complete-build.zsh -nightly 01 00 * * * $SCRIPTDIR/build/java_1.5_build.zsh
Crontab notes
- $MAILTO indicates the address that job output should be emailed to.
- $SHELL ensures a consistent (zsh) environment for jobs.
- $JAVA_HOME specifies the default java jdk to use when doing the nightly build (can be overridden by called scripts).
- $ANT_HOME forces a version of ant which is compatible with java 1.6 (default on bern isn't compatible).
- $SCRIPTDIR and $PROJECTDIR are machine and user specific.
- Use 'crontab -l' to print your current crontab. Use 'crontab -e' to make changes using your $EDITOR.
Explanation of crontab job lines
* * * * * <job_command_line> | | | | | | | | | +- day of the week (1-7, where 1 => monday) | | | | | | | +--- month (1-12) | | | | | +----- day of month (1-31) | | | +------- hour (0-23) | +--------- minute (0-59)
- An asterisk (*) is used to match any time value for a given scheduling field.
- Sends email to $MAILTO if the command prints to stdout or stderr.
- To avoid an email for a command and disregard any output append the following to the command line (zsh/bash):
> /dev/null 2>&1
