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Shell Programming and Scripting
[BASH] redirect standard error and use it inside
Post 302171763 by Pescator on Friday 29th of February 2008 11:54:26 AM
02-29-2008
[BASH] redirect standard error and use it inside
Hi all,
Maybe my question is too simple but till now i couldn't figure about a solution
I have a bash script scheduled in cron:
<cron time parameters> my_script.sh > result.log 2>&1
By this way i can have standard output and standard error in my result.log file
Now i want my script to alert me when some critical errors occurs.
For example, if i want to do a check like that:
ls $dir
if [ $? -ne 0 ]
then
echo "ALERT ALERT ALERT" >>fileAlert.log
fi
But as i redirected the stderror i can't catch it enymore with $?, isn't it?
When i launch the script, by commmand line:
my_script.sh > results.log 2>&1
i get the error:
"Ambiguous output redirect"
I can do something about that? Or maybe i miss something else?
For sure i can use AWK and similiar to parse output of each test in the script, but i would like to use the exit status of each command.
Is it possible??
thanks in advance!
Maybe my question is too simple but till now i couldn't figure about a solution
I have a bash script scheduled in cron:
<cron time parameters> my_script.sh > result.log 2>&1
By this way i can have standard output and standard error in my result.log file
Now i want my script to alert me when some critical errors occurs.
For example, if i want to do a check like that:
ls $dir
if [ $? -ne 0 ]
then
echo "ALERT ALERT ALERT" >>fileAlert.log
fi
But as i redirected the stderror i can't catch it enymore with $?, isn't it?
When i launch the script, by commmand line:
my_script.sh > results.log 2>&1
i get the error:
"Ambiguous output redirect"
I can do something about that? Or maybe i miss something else?
For sure i can use AWK and similiar to parse output of each test in the script, but i would like to use the exit status of each command.
Is it possible??
thanks in advance!
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LEARN ABOUT DEBIAN
libbash
LIBBASH(7) libbash Manual LIBBASH(7) NAME
libbash -- A bash shared libraries package. DESCRIPTION
libbash is a package that enables bash dynamic-like shared libraries. Actually its a tool for managing bash scripts whose functions you may want to load and use in scripts of your own. It contains a 'dynamic loader' for the shared libraries ( ldbash(1)), a configuration tool (ldbashconfig(8)), and some libraries. Using ldbash(1) you are able to load loadable bash libraries, such as getopts(1) and hashstash(1). A bash shared library that can be loaded using ldbash(1) must answer 4 requirments: 1. It must be installed in $LIBBASH_PREFIX/lib/bash (default is /usr/lib/bash). 2. It must contain a line that begins with '#EXPORT='. That line will contain (after the '=') a list of functions that the library exports. I.e. all the function that will be usable after loading that library will be listed in that line. 3. It must contain a line that begins with '#REQUIRE='. That line will contain (after the '=') a list of bash libraries that are required for our library. I.e. every bash library that is in use in our bash library must be listed there. 4. The library must be listed (For more information, see ldbashconfig(8)). Basic guidelines for writing library of your own: 1. Be aware, that your library will be actually sourced. So, basically, it should contain (i.e define) only functions. 2. Try to declare all variables intended for internal use as local. 3. Global variables and functions that are intended for internal use (i.e are not defined in '#EXPORT=') should begin with: __<library_name>_ For example, internal function myfoosort of hashstash library should be named as __hashstash_myfoosort This helps to avoid conflicts in global name space when using libraries that come from different vendors. 4. See html manual for full version of this guide. AUTHORS
Hai Zaar <haizaar@haizaar.com> Gil Ran <ril@ran4.net> SEE ALSO
ldbash(1), ldbashconfig(8), getopts(1), hashstash(1) colors(1) messages(1) urlcoding(1) locks(1) Linux Epoch Linux