Add more test examples, including expression negation

Closes #4383
2017-10-08 02:06:48 +02:00 · 2017-10-08 02:06:48 +02:00 · ff66d2f3c1
commit ff66d2f3c1
parent b61c4f1cbc
1 changed files with 16 additions and 0 deletions
--- a/doc_src/test.txt
+++ b/doc_src/test.txt
@ -139,6 +139,22 @@ if test $status -eq 0
 end
 \endfish

+The previous test can likewise be inverted:
+
+\fish
+if test ! $status -eq 0
+    echo "Previous command failed"
+end
+\endfish
+
+which is logically equivalent to the following:
+
+\fish
+if test $status -ne 0
+    echo "Previous command failed"
+end
+\endfish
+
 \subsection test-standards Standards

 `test` implements a subset of the <a href="http://www.unix.com/man-page/POSIX/1/test/">IEEE Std 1003.1-2008 (POSIX.1) standard</a>. The following exceptions apply: