I hope this bug will be fixed before the next release. But meanwhile,
here is a nasty workaround which can be used in bash startup scripts:
i_am_toplevel() {
case "$SHLVL" in
1) return 0 ;;
3) return 1 ;; # (optimize this case)
2) # HACK FOR Ubuntu 16.10, 17.04 ... where SHLVL=2 at top
if egrep -s '(terminal-server|^xterm)' /proc/$PPID/cmdline ; then
return 0
fi
;;
esac
return 1
}
Then say "if i_am_toplevel ; then ... "
instead of "if [ $SHLVL -eq 1 ] ..."
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https://bugs.launchpad.net/bugs/1707977
Title:
SHLVL=2 in outermost shell in unity terminals (REGRESSION)
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