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# tr(1)
```
tr [opt] str1 [str2]
-d delete characters in str1
-s squeeze repeating sequence of characters in str1
```
## Examples
### To lower
```sh
echo MoOsE | tr '[:upper:]' '[:lower:]'
# output: moose
```
### Replace characters
```sh
echo moose | tr 'o' '-'
# output: m--se
echo moose | tr 'os' '-'
# output: m---e
```
### Remove specific characters
```sh
echo moose | tr -d 'o'
# output: mse
echo moose | tr -d 'os'
# output: me
```
### Squeeze character sequences
```sh
echo moooooossse | tr -s 'os'
# output: mose
```
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