Qshell Interpreter (qsh) - FTP Directory Listing - IBM

Options
Operands
Exit status
Related information
Examples
When the -p option is specified, qsh displays the current action for the specified
condition(s) .
When no arguments are specified, qsh displays a list of the currently defined traps.
v -p Display each trap in a re-enterable format.
For action, you can specify:
v Null to ignore condition when it arises
v Minus (-) to reset condition to its original value.
v A command to be run each time condition arises.
For condition, you can specify:
v Name or number of a signal. You can use kill -l to display a list of valid signals.
For portability, you should always specify the signal name.
v 0 or EXIT. qsh runs action when the shell exits.
v ERR. qsh runs action when a command has a non-zero exit status.
v DEBUG. qsh runs action after each simple command.
If more than one condition arises at the same time, qsh runs the traps in this order:
1. DEBUG, if it is specified, then
2. ERR, if it is specified and applicable, then
3. Any other specified traps in signal number order, then
4. EXIT.
v 0 when successful.
v >0 when an invalid condition is specified.
v “kill - Terminate or signal processes”
v “wait - Wait for process completion”
1. Set a trap for the ERR condition: trap ′print Command failed’ ERR
2. Ignore the ERR condition: trap ′’ ERR
3. Reset the ERR condition to its original value: trap - ERR
4. Display the current action for the ERR condition: trap -p ERR
5. Display all of the currently defined traps: trap
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Chapter 4. Utilities 91