33 lines
797 B
Markdown
33 lines
797 B
Markdown
|
# Tee command
|
||
|
|
Duplicate piped output between a file and the stdout
|
||
|
|
|
||
|
|
```bash
|
||
|
|
sudo echo "something" > root_file
|
||
|
|
```
|
||
|
|
|
||
|
|
This won't work since output redirection is always done with user privileges.
|
||
|
|
Instead we use:
|
||
|
|
|
||
|
|
```bash
|
||
|
|
echo "something" | sudo tee root_file
|
||
|
|
echo "something" | sudo tee root_file &>/dev/null
|
||
|
|
```
|
||
|
|
|
||
|
|
Now the redirection will be executed with root privileges. Stdout can be
|
||
|
|
silenced to get the same effect as before. Tee can also copy output to multiple
|
||
|
|
files, or act like `>>` with `-a`
|
||
|
|
|
||
|
|
```bash
|
||
|
|
echo "something" | tee file1 | tee file2 > file3
|
||
|
|
```
|
||
|
|
|
||
|
|
It's very useful in vim, when you forget to use root privileges when editing a
|
||
|
|
root-only file:
|
||
|
|
|
||
|
|
```bash
|
||
|
|
:w ! sudo tee %
|
||
|
|
```
|
||
|
|
|
||
|
|
Note that neovim doesn't support interactive sessions through external commands
|
||
|
|
yet, so this only works in vim
|