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The cron Command
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An at job executes only once at a particular time. However, cron is much more flexible, because you can schedule system events to execute repetitively, at regular intervals, by using the crontab command. Each user on the system can have a crontab file, which allows them to schedule multiple events to occur at multiple times, on multiple dates. The jobs are specified by files in the /var/spool/cron/cronjobs directory, while configuration is managed by the files /etc/cron.d/cron.allow and /etc/cron.d/cron.deny. To check your own crontab, you can use the crontab l command:
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bash-2.05$ crontab -l root 10 3 * * 0,4 /etc/cron.d/logchecker 10 3 * * 0 /usr/lib/newsyslog 15 3 * * 0 /usr/lib/fs/nfs/nfsfind 1 2 * * * [ -x /usr/sbin/rtc ] && /usr/sbin/rtc -c > /dev/null 2>&1 30 3 * * * [ -x /usr/lib/gss/gsscred_clean ] && /usr/lib/gss/gsscred_clean
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This is the standard crontab generated by Solaris for root, and it performs tasks like checking if the cron logfile is approaching the system ulimit at 3:10 A.M. on Sundays and Thursdays, creating a new system log at 3:10 A.M. only on Sundays, and reconciling time differences at 2:01 A.M. every day of the year. The six fields in the crontab stand for the following: Minutes, in the range 0 59 Hours, in the range 0 23 Days of the month, in the range 1 31
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Shells, Scripts, and Scheduling
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Months of the year, in the range 1 12 Days of the week, in the range 0 6, starting with Sundays The command to execute If you want to add or delete an entry from your crontab, you can use the crontab e command. This starts up your default editor (vi on the command line, textedit in CDE), in which you can make changes interactively. After saving your job, you then need to run crontab by itself to make the changes.
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The following examples demonstrate how to use the shell.
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Setting Environment Variables
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Environment variables are used to store information in a form that is accessible to commands within the shell and other applications that are spawned from the shell. You can obtain a list of all environment variables that have been set in a shell by using the following command:
BASH=/bin/bash BASH_VERSINFO=([0]="2" [1]="05b" [2]="7" [3]="1" [4]="release" [5]="sparc-sun-solaris2.10") BASH_VERSION='2.05b.7(1)-release' COLUMNS=80 DIRSTACK=() EUID=1001 GROUPS=() HISTFILE=/export/home/pwatters/.bash_history HISTFILESIZE=500 HISTSIZE=500 HOME=/export/home/pwatters HOSTNAME=sakura HOSTTYPE=sparc HZ=100 IFS=$' \t\n' LC_COLLATE=en_US.ISO8859-1 LC_CTYPE=en_US.ISO8859-1 LC_MESSAGES=C LC_MONETARY=en_US.ISO8859-1 LC_NUMERIC=en_US.ISO8859-1 LC_TIME=en_US.ISO8859-1
Part II:
System Essentials
Although this seems to be a lot of shell variables, the most significant ones include the following:
BASH COLUMNS DISPLAY HOME HOSTNAME LD_LIBRARY_PATH LOGNAME MANPATH NNTPSERVER PATH PPID TERM UID WINDOWMANAGER
The path to the shell on the file system The columns width for the terminal The display variable that is used for X11 graphics The default home directory for the user The hostname of the current system The path to system and user libraries The username of the shell owner The path to the system manuals The hostname of the NNTP server The path that is searched to find applications where no absolute path is specified on the command line The parent process ID The terminal type (usually VT100) The user ID The name of the X11 window manager
The values of all shell variables can be set on the command line by using the export command. For example, if you want to set the terminal type to VT220, you use this command:
$ TERM=vt220; export TERM
Command Reference
The following commands are commonly used to get the most from the shell. Help for each of these commands is usually available through the man facility or the GNU info command.
Source (.)
The source command, represented as a single dot, reads in and executes the lines of a shell script. The format of this command is
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