Fixed issue with sed call to replace an alias, where characters were not being escaped correctly. Updates to help display, some of the messages when using the tool, and documentation in README.md.

Author: bhayatus

README.md

@@ -53,10 +53,17 @@ Running `aliaser help` displays the following:
 
         add <alias_name> <command>
               Creates/replaces an alias for the specified command in the aliases file
+
               The alias name must not contain any spaces, and can only consist of alphanumeric characters
 
+              In the event that you need to add an alias for a more complex command or an alias that contains several,
+              you can wrap with double quotes, i.e. $ aliaser add print_temp "cd temp && ls"
+
+              If you need to escape a character in the command, use a preceding \
+
         rm <alias_name>
               Removes the alias permanently from the aliases file
+
               The alias name must not contain any spaces
 
         help

aliaser

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-version="1.3.2"
+version="1.3.3"
 
 function print_version {
   echo $version
@@ -27,10 +27,17 @@ function print_help {
   echo 
   echo "      add <alias_name> <command>"
   echo "            Creates/replaces an alias for the specified command in the aliases file"
+  echo
   echo "            The alias name must not contain any spaces, and can only consist of the following characters: a-z A-Z 0-9 _ -"
   echo
+  echo "            In the event that you need to add an alias for a more complex command or an alias that contains several,"
+  echo "            you can wrap with double quotes, i.e. \$ aliaser add print_temp \"cd temp && ls\""
+  echo
+  echo "            If you need to escape a character in the command, use a preceding \\"
+  echo
   echo "      rm <alias_name>"
   echo "            Removes the alias permanently from the aliases file"
+  echo
   echo "            The alias name must not contain any spaces"
   echo
   echo "      help"
@@ -63,14 +70,16 @@ function add_alias {
     if [[ $response != "y" ]]; then
       exit
     else
-      sed -i.bak "s/^alias $alias=.*$/alias $alias='$command'/g" $alias_file
-      rm "$alias_file.bak"
+      sed -i.bak "s|^alias $alias=.*$|alias $alias='$command'|g" $alias_file
+      if [[ -f "$alias_file.bak" ]]; then
+        rm "$alias_file.bak"
+      fi
+        echo "Replaced alias '$alias'"
     fi
   else
     echo "alias $alias='$command'" >> $alias_file
+    echo "Added alias '$alias'"
   fi
-
-  echo "Added alias '$alias' for command '$command'"
 }
 
 function remove_alias {
@@ -81,7 +90,9 @@ function remove_alias {
   fi
 
   sed -i.bak "/^alias $alias=/d" $alias_file
-  rm "$alias_file.bak"
+  if [[ -f "$alias_file.bak" ]]; then
+    rm "$alias_file.bak"
+  fi
 
   echo "Removed alias '$alias'"
 }