sync.sh: Test if nothing to do

bash/sync.sh

@@ -498,6 +498,9 @@ parse_opts() {
         [[ -f "$_backup_dir/.syncrc" ]] && _config=${_config:-"$_backup_dir/.syncrc"}
     fi
 
+    # We do not know what to do...
+    [[ -z "$_config" ]] && usage
+
     # see https://unix.stackexchange.com/questions/406216
     CONFIG=$(realpath -sm "$_config")
     if [[ -z "$CONFIG" ]]; then
@@ -507,7 +510,7 @@ parse_opts() {
         printf "%s: Cannot open %s file\n" "$CMDNAME" "$CONFIG"
         exit 9
     fi
-    # shellcheck source=sync-conf-example.sh
+    # shellcheck source=share/sync/sync-conf-example.sh
     source "$CONFIG"
 
     # _backup_dir takes precedence on SOURCEDIR (useless ?)

config/home/.bashrc.br

@@ -178,7 +178,15 @@ export USERTMP=~/tmp
 alias fuck='sudo $(history -p \!\!)'
 
 # I am used to rehash...
-alias rehash="hash -r"
+# rehash - manage bash's remembered commands paths
+# $1...: Only forget those commands
+rehash() {
+    if (($#)); then
+        hash -d "$@"
+    else
+        hash -r
+    fi
+}
 
 # french-> english and english->french translation
 alias trans="trans.sh"