add func

.bash_aliases

@@ -88,5 +88,4 @@ alias music='mplayer -shuffle ~/Music/*'
 alias ve='python3 -m virtualenv venv'
 alias vd='deactivate'
 
-
-alias myshs='ps aux | grep -E "$(basename $SHELL)$" | grep -E "$USER"'
+alias mysh='ps aux | grep "$(basename "$SHELL")$" | grep "pendos" | grep -o -E "pts/[0-9]+"'

.bash_functions

@@ -87,9 +87,10 @@ extract () {
             *.zip)     unzip "$1"      ;;
             *.Z)       uncompress "$1" ;;
             *.7z)      7z x "$1"       ;;
-            *)         echo "'$1' cannot be extracted via $0" ;;
+            *)         echo "'$1' cannot be extracted via $0" >&2; return 1;;
         esac
     else
-        echo "'$1' is not a valid file"
+        echo "'$1' is not a valid file" >&2
+        return 1
     fi
-}
+}