Document environment variables for ztest, zdb, zfs, zinject and zpool.

Signed-off-by: Turbo Fredriksson <[email protected]>

Closes: openzfs#2691

man/man1/ztest.1

@@ -144,6 +144,10 @@ Maybe you'd like to run ztest for longer? To do so simply use the -T
 option and specify the runlength in seconds like so:
 .IP
 ztest -f / -V -T 120
+.SH "ENVIRONMENT VARIABLES" 
+.TP
+.B "ZTEST_FD_DATA"
+[unknown]
 .SH "SEE ALSO"
 .BR "zpool (1)" ","
 .BR "zfs (1)" ","

man/man8/zdb.8

@@ -526,5 +526,10 @@ dedup = 1.11, compress = 1.80, copies = 1.00, dedup * compress / copies = 2.00
 .in -2
 .sp
 
+.SH "ENVIRONMENT VARIABLES"
+.TP
+.B "SPA_CONFIG_PATH"
+Override the default \fBspa_config_path\fR (\fI/etc/zfs/zpool.cache\fR) setting. If \fB-U\fR flag is specified it will override this environment variable settings once again.
+
 .SH "SEE ALSO"
 zfs(8), zpool(8)

man/man8/zfs.8

@@ -3707,6 +3707,11 @@ M       F       /tank/test/modified
 .in -2
 .sp
 
+.SH "ENVIRONMENT VARIABLES"
+.TP
+.B "ZFS_ABORT
+Cause \fBzfs\fR to dump core on exit for the purposes of running \fB::findleaks\fR.
+
 .SH EXIT STATUS
 .LP
 The following exit values are returned:

man/man8/zinject.8

@@ -137,6 +137,11 @@ Set this to
 .BI "\-u"
 Unload the pool after injection.
 
+.SH "ENVIRONMENT VARIABLES"
+.TP
+.B "ZINJECT_DEBUG"
+Run \fBzinject\fR in debug mode.
+
 .SH "AUTHORS"
 This man page was written by Darik Horn <[email protected]>
 excerpting the \fBzinject\fR usage message and source code.

man/man8/zpool.8

@@ -2297,6 +2297,15 @@ An error occurred.
 Invalid command line options were specified.
 .RE
 
+.SH "ENVIRONMENT VARIABLES"
+.TP
+.B "ZFS_ABORT
+Cause \fBzpool\fR to dump core on exit for the purposes of running \fB::findleaks\fR.
+.TP
+.B "ZPOOL_IMPORT_PATH"
+The search path for devices or files to use with the pool. This is a colon-separated list of directories in which \fBzpool\fR looks for device nodes and files.
+Similar to the \fB-d\fR option in \fIzpool import\fR.
+
 .SH SEE ALSO
 .sp
 .LP