bin: improve many sctipts, add dif & bak

.local/bin/b

@@ -11,6 +11,6 @@ test -e "$last" || exit 1
 case "$(file --dereference --mime "$last")" in
   *inode/directory*) ls -l --color=always --human-readable --group-directories-first --file-type --dereference-command-line --almost-all "$@";;
   *binary) ;;
-  *) $(test -f "$last" -a ! -r "$last") bat --style header "$@";;
+  *) $(test -f "$last" -a ! -r "$last" && echo "sudo") bat --style header "$@"
+     stat -c '%A size %sB, birth: %.10w mod %.10y' "$last";;
 esac
-stat -c 'Permissions: %A, Created: %.10w, Modified %.10y, Size: %s' "$last"

.local/bin/bak

@@ -0,0 +1,2 @@
+#!/bin/sh
+test -f "$1.bak" && (mv "$1" /tmp && mv "$1.bak" "$1") || mv "$1" "$1.bak"

.local/bin/dif

@@ -0,0 +1,3 @@
+#!/bin/sh
+# diff with pagination
+diff --color=always "$@" | less --quit-if-one-screen

.local/bin/ex

@@ -16,7 +16,7 @@ if test -f $1 && test -r $1; then
     *.7z)        7z x $1      ;;
     *.deb)       ar x $1      ;;
     *.tar.xz)    tar xf $1    ;;
-    *.tar.zst)   unzstd $1    ;;
+    *.zst)   unzstd $1    ;;
     *)           echo "'$1' cannot be extracted via ex()" ;;
   esac
 else

.local/bin/focus

@@ -1,3 +1,6 @@
 playlistPath="$MUSIC/Playlists"
-result="$(test "$1" && (find -L $playlistPath -iname "focus-$1.m3u8" | grep . || find -L $playlistPath -iname "$1.m3u*" | grep . || find -L $MUSIC -iname "*$1*") | head -1 || echo "$playlistPath/focus.m3u8" )"
-test "$result" && vp "$result"
+test -z "$1" && vp "$playlistPath/focus.m3u8" ||
+(find -L $playlistPath -iname "focus-$1.m3u8" -print0 | grep --null-data . ||
+  find -L $playlistPath -iname "$1.m3u*" -print0 | grep --null-data . ||
+  find -L $MUSIC -iname "*$1*" -prune -exec find {} -size +2M -type f -not -iregex ".*.\(jpe?g\|png\)" -print0 \;) |
+  xargs -0 vp