Добавил хэлперы для if

src/condition.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+equal() {
+  local RETURN
+  RETURN=0
+  if [[ "$1" = "$2" ]];
+  then
+    RETURN=1
+  fi
+  echo $RETURN
+}

src/condition.test.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+
+. ./condition.sh
+
+# equal
+if [ $(equal 1 1) -eq 1 ]
+then
+  echo "equal numeric"
+fi
+
+if [[ $(equal 1 2) -eq 0 ]]
+then
+  echo "not equal numeric"
+fi
+
+if [[ $(equal "asdf" "asdf") -eq 1 ]]
+then
+  echo "equal string"
+fi
+
+if [[ $(equal "asdf" "asdf1") -eq 0 ]]
+then
+  echo "not equal string"
+fi