Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/19695#discussion_r149651615
--- Diff: dev/create-release/release-build.sh ---
@@ -130,6 +130,10 @@ else
fi
fi
+LSOF=lsof
+if ! hash $LSOF 2>/dev/null; then
--- End diff --
I am not sure .. but I found `hash` is used in few places more than
`command` within Spark:
```bash
grep -r "hash" . | grep ">/dev/null"
```
```
./dev/run-pip-tests:if hash virtualenv 2>/dev/null && [ ! -n "$USE_CONDA"
]; then
./dev/run-pip-tests: if hash python2 2>/dev/null; then
./dev/run-pip-tests: elif hash python 2>/dev/null; then
./dev/run-pip-tests: if hash python3 2>/dev/null; then
./dev/run-pip-tests:elif hash conda 2>/dev/null; then
./dev/run-pip-tests:if ! hash pip 2>/dev/null; then
./sql/create-docs.sh:if ! hash python 2>/dev/null; then
./sql/create-docs.sh:if ! hash mkdocs 2>/dev/null; then
```
Looks:
```bash
grep -r "command" . | grep ">/dev/null"
```
not used in Spark but .. I am not sure ..
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