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# Append text on install
Sometimes it might be useful to be able to append some text to a
file. Dotdrop is able to do that with the help of
[actions](../config/config-actions.md) and a temporary file.
Below is a config example to append to a file:
```yaml
dynvariables:
tmpfile: mktemp
variables:
somefile_final: ~/.somefile
dotfiles:
f_somefile:
dst: "{{@@ tmpfile @@}}"
src: somefile
actions:
- strip "{{@@ somefile_final @@}}"
- append "{{@@ tmpfile @@}}" "{{@@ somefile_final @@}}"
actions:
pre:
strip: "sed -i '/^# my pattern$/,$d' {0}"
post:
append: "cat {0} >> {1}; rm -f {0}"
```
During installation, the `strip` action is executed before the installation, and it strips everything from the pattern `# my pattern` to the end of the file. Then the dotfile `somefile` is installed in a temporary location (here `tmpfile`) and finally the post action `append` will append the contents of the `tmpfile` to the final dotfile pointed to by `somefile_final`.
Obviously, the dotfile in the dotpath should start with a unique pattern (here `# my pattern`):
```
# my pattern
this is the end
```
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