add_alias bash function: `add_alias lsa ls -a`

.sh_functions

# Usage add_alias [name] [command]
# Example: add_alias today date +%Y-%m-%d
# creates the alias today, which executes "date +%Y-%m-%d"
# make sure to add a line "source ~/.sh_aliases" to your config
function add_alias ()
{
  local cmd=$1;
  shift;
  local rest="$@";
  echo "alias $cmd=\"$rest\"" >> ~/.sh_aliases;
  source ~/.sh_aliases
}


# Usage exec_file [file]
# Runs a file with the appropriate app based on the file extension
function exec_file()
{
   local file=$1;
   filename=$(basename $file)
   extension="${filename##*.}"
   if [ "$extension" = "py" ]; then
       python "$file"
   elif [ "$extension" = "js" ]; then
       node "$file"
   elif [ "$extension" = "rb" ]; then
       ruby "$file"
   else
       echo "Unsupported file extension: $extension for file $filename"
   fi
}