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Top Forums Shell Programming and Scripting Running a shell script in cron...email not sending - help?? Post 302217577 by tjhorwood on Wednesday 23rd of July 2008 04:52:34 AM
Old 07-23-2008
Running a shell script in cron...email not sending - help??

I am pretty new to Unix shell scripting, but wondered if anyone could help (in layman's terms if possible!!) Smilie

I have a shell script which ultimately sends an alert to an email address if part of a batch of programs fails. Here's the script that sends the email:

Script: 6check.csh
#!/bin/csh
set alertperson = `cat /export/home/bdodym/alert.person`
if (-f critabend.tag ) then
cat callout6.msg | rmail $alertperson
rm critabend.tag
endif

This is where $alertperson will be forename.surname@address.com designation in the alert.person script

From the command line, all runs fine.

However, if I run through cron, it still seems to be executing the scripts (e.g files are created that I'm asking the script to do generally), but the email is not being sent as I would hope. In the below crontab, 6start.sh has a number of scripts to run through, the last of which is 6check2.csh (as per above)

crontab -l
#!/bin/csh
#############################################
# Minute Hour Month Day Month Weekday Command
# ___________________________________________________________
# 0 01 * * * Job_1
#
51 * * * * /export/home/bdodym/6start.sh

Does anyone know if there is anything additional I need to do add to either the script, or cron, to ensure the email sends? I think (from my VERY limited knowledge of this kind of thing!) that its something to do with the fact cron is running in the background rather than the terminal, as per the command line success. But, this is the final piece of the jigsaw and I just need to ensure I can get it to fit!! Smilie
 

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exit(1) 							   User Commands							   exit(1)

NAME
exit, return, goto - shell built-in functions to enable the execution of the shell to advance beyond its sequence of steps SYNOPSIS
sh exit [n] return [n] csh exit [ ( expr )] goto label ksh *exit [n] *return [n] DESCRIPTION
sh exit will cause the calling shell or shell script to exit with the exit status specified by n. If n is omitted the exit status is that of the last command executed (an EOF will also cause the shell to exit.) return causes a function to exit with the return value specified by n. If n is omitted, the return status is that of the last command exe- cuted. csh exit will cause the calling shell or shell script to exit, either with the value of the status variable or with the value specified by the expression expr. The goto built-in uses a specified label as a search string amongst commands. The shell rewinds its input as much as possible and searches for a line of the form label: possibly preceded by space or tab characters. Execution continues after the indicated line. It is an error to jump to a label that occurs between a while or for built-in command and its corresponding end. ksh exit will cause the calling shell or shell script to exit with the exit status specified by n. The value will be the least significant 8 bits of the specified status. If n is omitted then the exit status is that of the last command executed. When exit occurs when executing a trap, the last command refers to the command that executed before the trap was invoked. An end-of-file will also cause the shell to exit except for a shell which has the ignoreeof option (See set below) turned on. return causes a shell function or '.' script to return to the invoking script with the return status specified by n. The value will be the least significant 8 bits of the specified status. If n is omitted then the return status is that of the last command executed. If return is invoked while not in a function or a '.' script, then it is the same as an exit. On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways: 1. Variable assignment lists preceding the command remain in effect when the command completes. 2. I/O redirections are processed after variable assignments. 3. Errors cause a script that contains them to abort. 4. Words, following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a vari- able assignment. This means that tilde substitution is performed after the = sign and word splitting and file name generation are not performed. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
break(1), csh(1), ksh(1), sh(1), attributes(5) SunOS 5.10 15 Apr 1994 exit(1)
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