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Parser Reference: And (&&) Logical Operator

Continues next operation if previous operation passes

Description

When in the normal run mode (see “schedulers” link below) this will only run the command on the right hand side if the command on the left hand side does not error. Neither STDOUT nor STDERR are piped.

This has no effect in try nor trypipe run modes because they automatically apply stricter error handling.

Examples

Second command runs because the first command doesn’t error:

» out: one && out: two
one
two

Second command does not run because the first command produces an error:

» err: one && out: two
one

Detail

This is equivelent to a try block:

try {
    err: one
    out: two
}

See Also

• Pipeline: Overview of what a “pipeline” is
• STDERR Pipe (?) Token: Pipes STDERR from the left hand command to STDIN of the right hand command
• Schedulers: Overview of the different schedulers (or ‘run modes’) in murex
• err: Print a line to the STDERR
• out: Print a string to the STDOUT with a trailing new line character
• try: Handles errors inside a block of code
• trypipe: Checks state of each function in a pipeline and exits block on error