Fallback to hexdump if od not found

shellspec · Aug 5, 2019 · 3ce1d4e · 3ce1d4e
1 parent 19a9536
commit 3ce1d4e
Show file tree

Hide file tree

Showing 2 changed files with 7 additions and 3 deletions.
diff --git a/README.md b/README.md
@@ -123,7 +123,7 @@ shellspec is implemented in a pure shell script with a shell built-in commands a
 
 Currently used external (not shell built-in) commands.
 
-- `cat`, `date`, `ls`, `mkdir`, `od`, `rm`, `sleep`, `sort`, `time`
+- `cat`, `date`, `ls`, `mkdir`, `od` (or `hexdump` not posix), `rm`, `sleep`, `sort`, `time`
 - `ps` (used on systems without procfs, but not required.)
 - `kill`, `printf` (used but almost shell built-in.)
 

diff --git a/lib/libexec/binary.sh b/lib/libexec/binary.sh
@@ -2,10 +2,14 @@
 
 # busybox 1.1.3: `-A n`, `-t o1` not supported
 # busybox 1.10.2: `od -b` not working properly
-if echo | od -t o1 -v >/dev/null 2>&1; then
+if od -t o1 -v /dev/null >/dev/null 2>&1; then
   od_command() { od -t o1 -v; }
 else
-  od_command() { od -b -v; }
+  if [ $? -eq 127 ] && hexdump /dev/null >/dev/null 2>&1; then
+    od_command() { hexdump -b -v; }
+  else
+    od_command() { od -b -v; }
+  fi
 fi
 
 octal_dump() {