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Top Forums Shell Programming and Scripting How to print error and exit if command fails? Post 302309913 by lavascript on Thursday 23rd of April 2009 08:22:20 AM
Old 04-23-2009
How to print error and exit if command fails?

Guys any tips on printing a certain error message to stderr and exiting should a command fail within a ksh script? I'm trying to null some output files.

Touch isn't suitable as i need to null them.
print "" > file isn't suitable as i need to check elsehere for if they are 0bytes or not.

I've tried these below examples and none work correctly. I don't want to have to put a check after each command as :-

Code:
if [[ $? -ne 0 ]];then
   print "error blah blah" >&2
   exit 2
fi

Below tests don't work correctly. I'm guessing its spawning something.

Code:
OUTFILE=/tmp/out

# Null outfiles. Security already checked

> ${OUTFILE} || print "ERROR: blah blah \n" >&2 ; exit 2   #doesnt work

> ${OUTFILE} || (print "ERROR: blah blah \n" >&2 ; exit 2 )  #doesn't work

> ${OUTFILE} || (print "ERROR: blah blah \n" >&2 && exit 2) #doesnt work

if [[ -n "$(> ${OUTFILE} 2>&1)" ]];then
     print "ERROR: blah blah \n" >&2
     exit 2
fi    # doesnt work

Any ideas or alternatives?
 

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rbacdbchk(1M)															     rbacdbchk(1M)

NAME
rbacdbchk - Verifies the syntax of the Role-Based Access Control (RBAC) database files SYNOPSIS
DESCRIPTION
verifies that there are no conflicting or inconsistent entries in and amongst the RBAC database files. also checks the syntax of the data- base files and prints messages indicating which lines contain errors. returns zero output if no errors are present in the database files. All the RBAC database files and are verified. See rbac(5) for more information on these RBAC database files. Options supports the following options: Checks the database. Checks the database. Checks the database. Checks the database. Checks the database. Cross reference checks all databases. EXTERNAL INFLUENCES
Environment Variables determines the language in which messages are displayed. International Code Set Support Single-byte character code set is supported. RETURN VALUE
0. Success 1. Incorrect syntax EXAMPLES
The following example finds an error that user is an invalid user # rbacdbchk [/etc/rbac/user_role] John: Administrator invalid user The value 'John' for the Username field is bad. The following example finds a syntax error, an extra colon at the end of a line: # rbacdbchk [/etc/rbac/user_role] root: Administrator: invalid name: Not alphanumeric The value 'Administrator:' for the Rolename field is bad. [Role in role_auth DB with no assigned user in user_role DB] Administrator:(hpux.*, *) The following example finds a field missing: # rbacdbchk [/etc/rbac/roles] : my comment invalid name: <empty> The value '' for the Rolename field is bad. The following example finds a bad role: # rbacdbchk [Role in role_auth DB with no assigned user in user_role DB] blah:(hpux.*, *) [Invalid Role in role_auth DB. Role 'blah' does not exist in the roles DB] blah:(hpux.*, *) The following example finds a bad group name: # rbacdbchk [/etc/rbac/user_role] &blah: Administrator invalid group The value 'blah' for the Group name field is bad. FILES
Database containing valid definitions of all roles. Database containing definitions of all valid authorizations. Database specifying the roles for each specified user. Database that defines the authorizations for each role. Database containing the authorization to execute specified commands, and the privileges to alter uid and gid for command execution. Database that defines the role-to-authorization to audit SEE ALSO
authadm(1M), cmdprivadm(1M), privrun(1M), rbac(5). rbacdbchk(1M)
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