--- a/rc/bashrc	Mon Oct 31 20:42:42 2022 +0900
+++ b/rc/bashrc	Sun Dec 18 19:29:43 2022 +0900
@@ -170,6 +170,7 @@
     _root_opt=" -A"
   fi
   alias ls="${_ls}${_root_opt} -F --color=auto --group-directories-first"
+  unset _root_opt
   LS_COLORS='rs=0:di=01;34:ln=01;36:mh=00:pi=40;33:so=01;35:do=01;35:bd=40;33;01:cd=40;33;01:or=40;31;01:su=37;41:sg=30;43:ca=30;41:tw=30;42:ow=34;42:st=37;44:ex=01;32:*.tar=01;31:*.tgz=01;31:*.arj=01;31:*.taz=01;31:*.lzh=01;31:*.lzma=01;31:*.tlz=01;31:*.txz=01;31:*.zip=01;31:*.z=01;31:*.Z=01;31:*.dz=01;31:*.gz=01;31:*.lz=01;31:*.xz=01;31:*.bz2=01;31:*.bz=01;31:*.tbz=01;31:*.tbz2=01;31:*.tz=01;31:*.deb=01;31:*.rpm=01;31:*.jar=01;31:*.war=01;31:*.ear=01;31:*.sar=01;31:*.rar=01;31:*.ace=01;31:*.zoo=01;31:*.cpio=01;31:*.7z=01;31:*.rz=01;31:*.jpg=01;35:*.jpeg=01;35:*.gif=01;35:*.bmp=01;35:*.pbm=01;35:*.pgm=01;35:*.ppm=01;35:*.tga=01;35:*.xbm=01;35:*.xpm=01;35:*.tif=01;35:*.tiff=01;35:*.png=01;35:*.svg=01;35:*.svgz=01;35:*.mng=01;35:*.pcx=01;35:*.mov=01;35:*.mpg=01;35:*.mpeg=01;35:*.m2v=01;35:*.mkv=01;35:*.webm=01;35:*.ogm=01;35:*.mp4=01;35:*.m4v=01;35:*.mp4v=01;35:*.vob=01;35:*.qt=01;35:*.nuv=01;35:*.wmv=01;35:*.asf=01;35:*.rm=01;35:*.rmvb=01;35:*.flc=01;35:*.avi=01;35:*.fli=01;35:*.flv=01;35:*.gl=01;35:*.dl=01;35:*.xcf=01;35:*.xwd=01;35:*.yuv=01;35:*.cgm=01;35:*.emf=01;35:*.axv=01;35:*.anx=01;35:*.ogv=01;35:*.ogx=01;35:*.aac=00;36:*.au=00;36:*.flac=00;36:*.mid=00;36:*.midi=00;36:*.mka=00;36:*.mp3=00;36:*.mpc=00;36:*.ogg=00;36:*.ra=00;36:*.wav=00;36:*.axa=00;36:*.oga=00;36:*.spx=00;36:*.xspf=00;36:';
   export LS_COLORS
 fi
@@ -210,27 +211,28 @@
 # MySQL in common locations highest priority since new = better. Also no compatibility problem.
 # Cluster is superset of Enterprise/GPL so it gets highest priority.
 # And use only one.
-for mydir in {"${HOME}",/apps,/opt}/mysql/{{cluster,enterprise}/mysql/,}bin; do
-  if [ -d "${mydir}" ]; then
-    PATH="${mydir}:${PATH}"
+for i in {"${HOME}",/apps,/opt}/mysql/{{cluster,enterprise}/mysql/,}bin; do
+  if [ -d "${i}" ]; then
+    PATH="${i}:${PATH}"
     break
   fi
 done
 
 # Mercurial is optional since it will be inconsistent with ssh ... hg if this one gets priority.
 # And use only one.
-for hgdir in {"${HOME}/apps","/opt"}/mercurial{,/bin}; do
-  hgbin="${hgdir}/hg"
-  if [ -x "${hgbin}" ]; then
+for i in {"${HOME}/apps","/opt"}/mercurial{,/bin}; do
+  _hgbin="${i}/hg"
+  if [ -x "${_hgbin}" ]; then
     PATH="${PATH}:${hgdir}"
-    alias nhg="${hgbin}"
+    alias nhg="${_hgbin}"
     break
   fi
 done
+unset _hgbin
 
-for supbindir in {"${HOME}/apps","/opt"}/supervisor{,d}/bin; do
-  if [ -d "${supbindir}" ]; then
-    PATH="${PATH}:${supbindir}"
+for i in {"${HOME}/apps","/opt"}/supervisor{,d}/bin; do
+  if [ -d "${i}" ]; then
+    PATH="${PATH}:${i}"
     break
   fi
 done
@@ -310,6 +312,7 @@
 unset _os
 unset _os_r
 unset _uid
+unset i
 
 # reset cursor shape
 # reference: https://conemu.github.io/en/AnsiEscapeCodes.html#Terminal_modes