How to delete a substring using shell script

Question

I have strings called: ``` abc.out def.out ``` How do I delete the substring .out In these strings? What command should I use? (Bourne Shell)

Accepted Answer

Multiple ways, a selection:

`str=abc.out`

Shell:

```
echo ${str%.*}
```

Grep:

```
echo $str | grep -o '^[^\.]*'
```

Sed:

```
echo $str | sed -E 's/(.*?)\..*/\1/'
```

Awk:

```
echo $str | awk -F. '{print $1}'
```

`-F.` means split the string by . and `$1` means the first column.

Cut:

`echo $str | cut -d. -f1`

All output:

```
abc
```

Solution