fix: standardize shebangs, error handling, and minor issues in x-* scripts

Normalize shebangs to #!/usr/bin/env bash (x-env-list, x-localip).
Use XDG_CONFIG_HOME in x-change-alacritty-theme. Remove unused
VERBOSE variable in x-multi-ping. Add set -euo pipefail to x-when-down
and x-when-up. Add usage header to x-term-colors. Fix notify-call
to notify-send.sh in x-record.

local/bin/x-change-alacritty-theme

@@ -8,7 +8,7 @@ set -euo pipefail
 # Enable verbosity with VERBOSE=1
 VERBOSE="${VERBOSE:-0}"
 
-A_DIR="$HOME/.config/alacritty"
+A_DIR="${XDG_CONFIG_HOME:-$HOME/.config}/alacritty"
 
 # Function to print usage information
 usage()

local/bin/x-env-list

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # List environment variables grouped by the first part before underscore
 # protecting environment variables that possibly contain sensitive information.

local/bin/x-localip

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # x-localip: script to display the local IP addresses of the system
 #

local/bin/x-multi-ping

@@ -39,7 +39,6 @@
 # Defaults
 LOOP=0
 SLEEP=1
-VERBOSE=0
 TIMEOUT=5
 
 usage()
@@ -60,8 +59,6 @@ while [[ $# -gt 0 ]]; do
       exit 0
       ;;
     --verbose)
-      # shellcheck disable=SC2034
-      VERBOSE=1
       shift
       ;;
     --loop | --forever)

local/bin/x-record

@@ -35,7 +35,7 @@ msg()
 # Notify function
 notify()
 {
-  notify-call --replace-file "$replace_id" "$@"
+  notify-send.sh --replace-file "$replace_id" "$@"
 }
 
 # Stop recording function

local/bin/x-term-colors

@@ -1,11 +1,13 @@
 #!/usr/bin/env bash
 #
-#   This file echoes a bunch of 24-bit color codes
-#   to the terminal to demonstrate its functionality.
-#   The foreground escape sequence is ^[38;2;<r>;<g>;<b>m
-#   The background escape sequence is ^[48;2;<r>;<g>;<b>m
-#   <r> <g> <b> range from 0 to 255 inclusive.
-#   The escape sequence ^[0m returns output to default
+# Display 24-bit terminal color test.
+#
+# Usage: x-term-colors
+#
+# The foreground escape sequence is ^[38;2;<r>;<g>;<b>m
+# The background escape sequence is ^[48;2;<r>;<g>;<b>m
+# <r> <g> <b> range from 0 to 255 inclusive.
+# The escape sequence ^[0m returns output to default
 
 setBackgroundColor()
 {

local/bin/x-when-down

@@ -1,4 +1,5 @@
 #!/usr/bin/env bash
+set -euo pipefail
 #
 # Wait until a given host is down (determined by ping) then execute the
 # given command

local/bin/x-when-up

@@ -1,4 +1,5 @@
 #!/usr/bin/env bash
+set -euo pipefail
 #
 # Wait until a given host is online (determined by ping) then execute the
 # given command