diff --git a/regress/new-session-base-index.sh b/regress/new-session-base-index.sh
new file mode 100644
index 00000000..337037c3
--- /dev/null
+++ b/regress/new-session-base-index.sh
@@ -0,0 +1,27 @@
+#!/bin/sh
+
+# new session base-index
+
+PATH=/bin:/usr/bin
+TERM=screen
+
+[ -z "$TEST_TMUX" ] && TEST_TMUX=$(readlink -f ../tmux)
+TMUX="$TEST_TMUX -Ltest"
+$TMUX kill-server 2>/dev/null
+
+TMP=$(mktemp)
+trap "rm -f $TMP" 0 1 15
+
+cat <<EOF >$TMP
+set -g base-index 100
+new
+set base-index 200
+neww
+EOF
+
+$TMUX -f$TMP start
+echo $($TMUX lsw -F'#{window_index}') >$TMP
+(echo "100 200"|cmp -s - $TMP) || exit 1
+$TMUX kill-server 2>/dev/null
+
+exit 0
diff --git a/regress/new-session-command.sh b/regress/new-session-command.sh
new file mode 100644
index 00000000..02ba55d9
--- /dev/null
+++ b/regress/new-session-command.sh
@@ -0,0 +1,25 @@
+#!/bin/sh
+
+# new session command
+
+PATH=/bin:/usr/bin
+TERM=screen
+
+[ -z "$TEST_TMUX" ] && TEST_TMUX=$(readlink -f ../tmux)
+TMUX="$TEST_TMUX -Ltest"
+$TMUX kill-server 2>/dev/null
+
+TMP=$(mktemp)
+trap "rm -f $TMP" 0 1 15
+ 
+cat <<EOF >$TMP
+new sleep 101
+new -- sleep 102
+new "sleep 103"
+EOF
+
+$TMUX -f$TMP start
+[ $($TMUX ls|wc -l) -eq 3 ] || exit 1
+$TMUX kill-server 2>/dev/null
+
+exit 0
diff --git a/regress/new-session-environment.sh b/regress/new-session-environment.sh
new file mode 100644
index 00000000..52198d12
--- /dev/null
+++ b/regress/new-session-environment.sh
@@ -0,0 +1,54 @@
+#!/bin/sh
+
+# new session environment
+
+PATH=/bin:/usr/bin
+TERM=screen
+
+[ -z "$TEST_TMUX" ] && TEST_TMUX=$(readlink -f ../tmux)
+TMUX="$TEST_TMUX -Ltest"
+$TMUX kill-server 2>/dev/null
+
+TMP=$(mktemp)
+SCRIPT=$(mktemp)
+trap "rm -f $TMP $SCRIPT" 0 1 15
+
+cat <<EOF >$SCRIPT
+(
+echo TERM=\$TERM
+echo PWD=\$(pwd)
+echo PATH=\$PATH
+echo SHELL=\$SHELL
+echo TEST=\$TEST
+) >$TMP
+EOF
+
+cat <<EOF >$TMP
+new -- /bin/sh $SCRIPT
+EOF
+
+(cd /; env -i TERM=ansi TEST=test1 PATH=1 SHELL=/bin/sh \
+	$TMUX -f$TMP start) || exit 1
+sleep 1
+(cat <<EOF|cmp -s - $TMP) || exit 1
+TERM=screen
+PWD=/
+PATH=1
+SHELL=/bin/sh
+TEST=test1
+EOF
+
+(cd /; env -i TERM=ansi TEST=test2 PATH=2 SHELL=/bin/sh \
+	$TMUX new -d -- /bin/sh $SCRIPT) || exit 1
+sleep 1
+(cat <<EOF|cmp -s - $TMP) || exit 1
+TERM=screen
+PWD=/
+PATH=2
+SHELL=/bin/sh
+TEST=test2
+EOF
+
+$TMUX kill-server 2>/dev/null
+
+exit 0
diff --git a/regress/new-window-command.sh b/regress/new-window-command.sh
new file mode 100644
index 00000000..176bffb5
--- /dev/null
+++ b/regress/new-window-command.sh
@@ -0,0 +1,26 @@
+#!/bin/sh
+
+# new session command
+
+PATH=/bin:/usr/bin
+TERM=screen
+
+[ -z "$TEST_TMUX" ] && TEST_TMUX=$(readlink -f ../tmux)
+TMUX="$TEST_TMUX -Ltest"
+$TMUX kill-server 2>/dev/null
+
+TMP=$(mktemp)
+trap "rm -f $TMP" 0 1 15
+ 
+cat <<EOF >$TMP
+new
+neww sleep 101
+neww -- sleep 102
+neww "sleep 103"
+EOF
+
+$TMUX -f$TMP start
+[ $($TMUX lsw|wc -l) -eq 4 ] || exit 1
+$TMUX kill-server 2>/dev/null
+
+exit 0