03-13-2005
Quote:
Originally Posted by Perderabo
Debug output should go to stderr, not stdout.
Very true, I did provide the alternative because I think the concern was that additional output might be added to the program by someone lazy or not sufficiently informed as to know that.
satguyz, you should read up on the use of stdout and stderr for both your application and your shell script.
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LEARN ABOUT NETBSD
atf-check
ATF-CHECK(1) BSD General Commands Manual ATF-CHECK(1)
NAME
atf-check -- executes a command and analyzes its results
SYNOPSIS
atf-check [-s qual:value] [-o action:arg ...] [-e action:arg ...] [-x] command
atf-check -h
DESCRIPTION
atf-check executes a given command and analyzes its results, including exit code, stdout and stderr.
In the first synopsis form, atf-check will execute the provided command and apply checks specified by arguments. By default it will act as
if it was run with -s exit:0 -o empty -e empty. Multiple checks for the same output channel are allowed and, if specified, their results
will be combined as a logical and (meaning that the output must match all the provided checks).
In the second synopsis form, atf-check will print information about all supported options and their purpose.
The following options are available:
-h Shows a short summary of all available options and their purpose.
-s qual:value Analyzes termination status. Must be one of:
exit:<value> checks that the program exited cleanly and that its exit status is equal to value. The exit code can be omit-
ted altogether, in which case any clean exit is accepted.
ignore ignores the exit check.
signal:<value> checks that the program exited due to a signal and that the signal that terminated it is value. The signal
can be specified both as a number or as a name, or it can also be omitted altogether, in which case any signal
is accepted.
Most of these checkers can be prefixed by the 'not-' string, which effectively reverses the check.
-o action:arg Analyzes standard output. Must be one of:
empty checks that stdout is empty
ignore ignores stdout
file:<path> compares stdout with given file
inline:<value> compares stdout with inline value
match:<regexp> looks for a regular expression in stdout
save:<path> saves stdout to given file
Most of these checkers can be prefixed by the 'not-' string, which effectively reverses the check.
-e action:arg Analyzes standard error (syntax identical to above)
-x Executes command as a shell command line, executing it with the system shell defined by ATF_SHELL in atf-config(1). You
should avoid using this flag if at all possible to prevent shell quoting issues.
EXIT STATUS
atf-check exits 0 on success, and other (unspecified) value on failure.
EXAMPLES
# Exit code 0, nothing on stdout/stderr
atf-check 'true'
# Typical usage if failure is expected
atf-check -s not-exit:0 'false'
# Checking stdout/stderr
echo foobar >expout
atf-check -o file:expout -e inline:"xx yy
"
'echo foobar ; printf "xx yy
" >&2'
# Checking for a crash
atf-check -s signal:sigsegv my_program
# Combined checks
atf-check -o match:foo -o not-match:bar echo foo baz
SEE ALSO
atf-config(1), atf(7)
BSD
June 27, 2010 BSD