reference > Flags

--dryrun

Accepted by

opengrep scan

Also spelled

--no-dryrun

Default

false

See also

--autofix, --replacement, fix

Prevents --autofix from writing to the files. The text output shows each fix on a fix: line, and the files are not changed. Without --autofix, the flag has no effect. --no-dryrun turns it off.

## Examples

### Seeing a fix without applying it

rules:  - id: use-is-none    pattern: $X == None    fix: $X is None    message: use "is None"    languages: [python]    severity: WARNING

if x == None:    pass

$ opengrep scan -q --config fix.yaml --autofix --dryrun app.py
app.py

  warn  use-is-none
  use "is None"

     1: if (x is None):
   fix: (x is None)
$ cat app.py
if x == None:
    pass
$ opengrep scan --config fix.yaml --autofix app.py > /dev/null 2>&1
$ cat app.py
if (x is None):
    pass

The output shows the line as it would be after the fix. The file changes only when --autofix runs without --dryrun.