Created SC2058 (markdown)

2025-10-03 19:29:44 +08:00 · 2018-04-02 21:23:30 -07:00
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+## Unknown unaryoperator.
+
+### Problematic code:
+
+```sh
+[ -E 42 ]
+```
+
+### Correct code:
+
+```sh
+[ -e 42 ]
+```
+
+### Rationale:
+
+You are using an unknown unary operator in a `test` expression. Perhaps it's a typo?
+
+In bash, you can use `help test` to see a list of supported operators:
+
+      -a FILE        True if file exists.
+      -b FILE        True if file is block special.
+      -c FILE        True if file is character special.
+      -d FILE        True if file is a directory.
+      -e FILE        True if file exists.
+      -f FILE        True if file exists and is a regular file.
+      -g FILE        True if file is set-group-id.
+      -h FILE        True if file is a symbolic link.
+      -L FILE        True if file is a symbolic link.
+      -k FILE        True if file has its `sticky' bit set.
+      -p FILE        True if file is a named pipe.
+      -r FILE        True if file is readable by you.
+      -s FILE        True if file exists and is not empty.
+      -S FILE        True if file is a socket.
+      -t FD          True if FD is opened on a terminal.
+      -u FILE        True if the file is set-user-id.
+      -w FILE        True if the file is writable by you.
+      -x FILE        True if the file is executable by you.
+      -O FILE        True if the file is effectively owned by you.
+      -G FILE        True if the file is effectively owned by your group.
+      -N FILE        True if the file has been modified since it was last read.
+
+### Exceptions:
+
+None. If you've tested and verified that the operator works but the latest version of ShellCheck says it's unknown, please [submit a bug report](https://github.com/koalaman/shellcheck/issues).
+
+### Related resources:
+
+* [The classic test command](http://wiki.bash-hackers.org/commands/classictest) on the Bash Hackers wiki.
+* [The conditional expression](http://wiki.bash-hackers.org/syntax/ccmd/conditional_expression) on the Bash Hackers wiki.
+* [Tests and conditionals](https://mywiki.wooledge.org/BashGuide/TestsAndConditionals) on the Wooledge BashGuide.