change backup method of install script

install.bsh

@@ -1,4 +1,12 @@
 #!/bin/bash
+# https://github.com/gpakosz/.tmux
+# (‑●‑●)> dual licensed under the WTFPL v2 license and the MIT license,
+#         without any warranty.
+#         Copyright 2012— Gregory Pakosz (@gpakosz).
+#
+# @author kidlike
+
+set -e
 
 WD="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 INST_DIR="$HOME/.oh-my-tmux"
@@ -7,15 +15,12 @@ TMUX_CONF="$HOME/.tmux.conf"
 # backup pre-existing
 if [ -z "$SKIP_BACKUP" ]; then
   if [ -r $TMUX_CONF ]; then
-    if [ -L $TMUX_CONF ]; then
-      ln -sf $TMUX_CONF "${TMUX_CONF}.bak.$(ls -l ${TMUX_CONF}.bak* 2>/dev/null | wc -l)"
-    else
-      cp $TMUX_CONF "${TMUX_CONF}.bak.$(ls -l ${TMUX_CONF}.bak* 2>/dev/null | wc -l)"
-    fi
+    BACKUP_NAME="${TMUX_CONF}.bak.$(ls -l ${TMUX_CONF}.bak* 2>/dev/null | wc -l)"
+    cat $TMUX_CONF > $BACKUP_NAME
   fi
 fi
 
-# skip if already at INST_DIR
+# skip step if already at INST_DIR
 if [ "$(realpath $WD)" != "$(realpath $INST_DIR)" ]; then
   rm -rf "$INST_DIR"
   ln -sf "$WD" "$INST_DIR"

oh-my-tmux.sh

@@ -3,6 +3,9 @@
 #         without any warranty.
 #         Copyright 2012— Gregory Pakosz (@gpakosz).
 #
+# @author gpakosz
+# @author kidlike
+#
 # /!\ do not edit this file
 #     instead, override settings in the following files:
 #     - oh-my-tmux.local.conf