03-19-2019
Despite nezabudka's and MadeInGermany's comments being correct they don't explain the error message. It comes from the shell interpreting the < as the redirection operator for stdin, and it doesn't find the file named the $error_limit's value. Escaping it would have helped circumvent that error, but had immediately stumbled over the next one: <= is not an accepted operator (in bashat least - you didn't mention the shell you use), use ! ... \> in lieu. Be aware that either of these compare values lexicographically using the current locale, so 145 would be considered less than 87, for instance. That's where nezabudka's proposals to use integer / numerical operators (like -le) come into play.
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LEARN ABOUT SUSE
alter_operator_class
ALTER OPERATOR
CLASS(7) SQL Commands ALTER OPERATOR CLASS(7)
NAME
ALTER OPERATOR CLASS - change the definition of an operator class
SYNOPSIS
ALTER OPERATOR CLASS name USING index_method RENAME TO newname
ALTER OPERATOR CLASS name USING index_method OWNER TO newowner
DESCRIPTION
ALTER OPERATOR CLASS changes the definition of an operator class.
You must own the operator class to use ALTER OPERATOR CLASS. To alter the owner, you must also be a direct or indirect member of the new
owning role, and that role must have CREATE privilege on the operator class's schema. (These restrictions enforce that altering the owner
doesn't do anything you couldn't do by dropping and recreating the operator class. However, a superuser can alter ownership of any operator
class anyway.)
PARAMETERS
name The name (optionally schema-qualified) of an existing operator class.
index_method
The name of the index method this operator class is for.
newname
The new name of the operator class.
newowner
The new owner of the operator class.
COMPATIBILITY
There is no ALTER OPERATOR CLASS statement in the SQL standard.
SEE ALSO
CREATE OPERATOR CLASS [create_operator_class(7)], DROP OPERATOR CLASS [drop_operator_class(7)], ALTER OPERATOR FAMILY [alter_operator_fam-
ily(7)]
SQL - Language Statements 2010-05-14 ALTER OPERATOR CLASS(7)