changed "$0" to "$(basename $0)" in pdm-* scripts usage string

bin/pdm-build

@@ -17,7 +17,7 @@ DEFINE_boolean 'squash' false 'squash newly built layers into a single new layer
 DEFINE_boolean 'debug' false "Don't delete temporary container on build fail" 'd'
 DEFINE_string 'tag' 'latest' 'Tag (other than date) to assign to the image' 't'
 
-FLAGS_HELP="Usage: $0 [-sd] [-t tag] [directory] [name]
+FLAGS_HELP="Usage: $(basename $0) [-sd] [-t tag] [directory] [name]
 
 Builds an image from the Containerfile and (optionally) Systemdfile in the
 specified directory, and tags the image with the given name. If no directory

bin/pdm-launch

@@ -6,7 +6,7 @@ DEFINE_boolean 'overwrite' false 'Overwrite container if one with same name alre
 DEFINE_boolean 'config' false 'Automatically configure container with deploy options stored in image metadata.' 'c'
 DEFINE_string 'label' 'deployopts' 'Image metadata label from which to get the deploy options.' 'l'
 
-FLAGS_HELP="Usage: $0 [-oc] [-d label] [image] [name]
+FLAGS_HELP="Usage: $(basename $0) [-oc] [-d label] [image] [name]
 
 Creates and starts a container from the specified image, and assigns it the
 specified name. If no image argument is given, uses the current working

bin/pdm-shell

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 if [[ -z $1 || $1 == "-h" || $1 == "--help" ]]; then
-        echo "Usage: $0 container
+        echo "Usage: $(basename $0) container
 
 Start a shell on the given container, and connect to it."
         exit 1