dbginfo.sh: sort list of environment variables for readability

The "detour" with NUL terminated records ensures that sorting
works as expected for environment variables with values containing
one or more lines and thus '\n' as regular record separator.

Reviewed-by: Joern Siglen <siglen@de.ibm.com>
Signed-off-by: Steffen Maier <maier@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>

CHANGELOG.md

@@ -13,6 +13,7 @@ Release history for s390-tools (MIT version)
   - chreipl-fcp-mpath: bundle a pre-cooked version of the manpage for
       build environments without access to `pandoc`
   - dbginfo.sh: Add multipath info to map paths to FC addressing and prio group
+  - dbginfo.sh: Sort list of environment variables for readability
 
   Bug Fixes:
 

scripts/dbginfo.sh

@@ -427,7 +427,7 @@ CMDS="uname -a\
   :systemctl --all --no-pager list-unit-files\
   :systemd-delta\
   :ulimit -a\
-  :env\
+  :env --null | sort --zero-terminated | tr '\000' '\n'\
   :find /boot -print0 | sort -z | xargs -0 -n 10 ls -ld\
   :find /var/crash -print0 | sort -z | xargs -0 -n 10 ls -ld\
   :df -h\