add: usage and dependency check

1 files changed, 20 insertions, 0 deletions

diff --git a/compress b/compress
index f1f641a..547a4ba 100755
--- a/compress
+++ b/compress
@@ -1 +1,21 @@
 #!/usr/bin/env bash
+
+#usage
+usage(){
+	echo "Usage: compress <file1> <file2> ..."
+}
+
+#check for dependencies
+_check_deps(){
+	deps=(
+		tar
+		gpg
+		)
+		for dep in "${deps[@]}";
+		do
+			if ! command -v "${deps[@]}" &>/dev/null; then
+				echo "Error: $dep not found. Install $dep first."
+				exit 1
+			fi
+		done
+}